display DODGE RAM 1999 Service Owner's Guide

1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step
15). If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed
count is "0", go to next step.
2) Repair any other transmission related DTCs before
proceeding. See DIAGNOSTIC TROUBLE CODES (DTC) & DRB MESSAGES table.
If no other transmission related DTCs exist, go to next step.
3) Start engine. Allow engine to reach normal operating
temperature. Set parking brake, depress brake pedal and place gear
selector in "D" position. Using scan tool, read governor pressure
sensor value. If value is greater than 3 psi (.2 kg/cm
), go to next
step. If value is 3 psi (.2 kg/cm) or less, go to step 7).
4) Turn ignition off. Install a pressure gauge at
transmission governor pressure test port. See TESTING in appropriate
AUTOMATIC TRANSMISSION OVERHAUL article. Start engine. With gear
selector in "D” position, read gauge pressure. If pressure is
less than 5 psi (.3 kg/cm
), go to step 12). If pressure is 5 psi (.3
kg/cm) or greater, go to next step.
5) Turn engine off. Drain transmission fluid and remove oil
pan. Inspect oil pan for burnt oil and debris. Repair transmission as
necessary. See appropriate AUTOMATIC TRANSMISSION OVERHAUL article. If
transmission is okay, go to next step.
6) Replace governor pressure solenoid. Start engine. Read
gauge pressure. If pressure is less than 5 psi (.3 kg/cm
), testing is
complete. If pressure is 5 psi (.3 kg/cm) or greater, replace valve
body.
NOTE: Removing transmission control relay in the following step may
set other DTCs. Disregard these DTCs.
7) Place gear selector in Park. With engine still running,
remove transmission control relay. Depress brake pedal and place gear
selector in "D" position. Read governor pressure sensor value. If
value is 40-55 psi (2.8-3.9 kg/cm
), go to next step. If value is not
as specified, go to step 10).
8) Turn engine off. Install transmission control relay. Drive
vehicle at 25-30 MPH. Using scan tool, monitor governor actual
pressure and target pressure. If pressures do not stay consistently
within 5 psi (.3 kg/cm
) of each other within 3 seconds, go to next
step. If pressures stay consistently within 5 psi (.3 kg/cm) of each
other, test is complete.
9) Replace governor pressure solenoid. Drive vehicle at 25-30
MPH. Using scan tool, monitor governor actual pressure and target
pressure. If pressures do not stay consistently within 5 psi (.3
kg/cm
) of each other, repair internal transmission leakage problem.
If pressures stay consistently within 5 psi (.3 kg/cm) of each other,
testing is complete.
10) On all bodies except WJ body, go to next step. On WJ
body, turn ignition on, engine off. Measure voltage (backprobe)
between ground and 5-volt supply circuit at transmission solenoid
harness connector. If voltage is 4.5 volts or less, repair 5-volt
supply circuit for low voltage. If voltage is greater than 4.5 volts,
go to next step.
11) Turn ignition off. Install transmission control relay.
Install a pressure gauge at governor pressure test port. See TESTING
in appropriate AUTOMATIC TRANSMISSION OVERHAUL article. Start engine.
Remove transmission control relay. Depress brake pedal and place gear
selector in "D" position. Read gauge pressure. If pressure is 40-55
psi (2.8-3.9 kg/cm
), go to next step. If pressure is not as
specified, go to step 13).
12) Turn ignition off. Disconnect transmission solenoid
harness connector. Inspect connector and terminals for damage. Repair

as necessary. If connector and terminals are okay, turn ignition on.
Measure voltage between ground and 5-volt supply circuit at
transmission solenoid harness connector. If voltage is 4.5 volts or
less, repair open 5-volt supply circuit. If voltage is greater than 4.
5 volts, replace governor pressure sensor.
13) Turn engine off. Install transmission control relay.
Drain transmission fluid and remove oil pan. Inspect pan for burnt oil
and debris. Repair transmission as necessary. See appropriate
AUTOMATIC TRANSMISSION OVERHAUL article. If transmission is okay, go
to next step.
14) Replace governor pressure solenoid. Replace transmission
oil pan and refill fluid. Start engine. Remove transmission control
relay. Depress brake pedal and place gear selector in "D" position.
Read gauge pressure. If pressure is 40-55 psi (2.8-3.9 kg/cm
),
testing is complete. If pressure is not as specified, replace valve
body.
15) Conditions required to set DTC P1756 are not present at
this time. Using scan tool, clear DTCs. Start engine and check for
DTCs. Wiggle wiring harness between governor pressure sensor and PCM.
Note if DTC P1756 resets. If DTC P1756 resets, repair wiring harness
as necessary. If DTC P1756 does not reset, see INACTIVE DTC CONDITION
under SELF-DIAGNOSTIC SYSTEM. Testing is complete.
DTC P1757: GOV PRES ABOVE 3 PSI IN GEAR WITH 0 MPH
Circuit Description
Circuit is monitored continuously while key is on and engine
running, not in Park or Neutral position or with Malfunction Indicator
Light (MIL) illuminated. Code sets if governor pressure sensor is
greater than 3 psi (.2 kg/cm
) when requested pressure is zero with
governor pressure solenoid duty cycle at 95 percent for 2.65 seconds.
Test must fail twice to set code.
Possible Causes
* Other transmission codes are set.
* Solenoid pack connector 5-volt supply circuit open.
* Governor pressure sensor defective.
* Wiring harness and/or connectors defective.
* Transmission fluid burnt or oil pan has excessive debris.
* Valve body defective.
Diagnostic Procedures
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step 8).
If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is
"0", go to next step.
2) Repair any other transmission related DTCs before
proceeding. If no other transmission related DTCs exist, go to next
step.
3) Start engine. Allow engine to reach normal operating
temperature. Set parking brake, depress brake pedal and place gear
selector in "D" position. Using scan tool, read governor pressure
sensor value. If value is greater than 3 psi (.2 kg/cm
), go to next
step. If value is 3 psi (.2 kg/cm) or less, go to step 8).
4) Turn ignition off. Install a pressure gauge at governor
pressure test port. See TESTING in appropriate AUTOMATIC TRANSMISSION
OVERHAUL article. Start engine. With gear selector in "D" position,
read gauge pressure. If pressure is less than 3 psi (.2 kg/cm
), go to
step 7). If pressure is 3 psi (.2 kg/cm) or greater, go to next step.
5) Turn engine off. Drain transmission fluid and remove oil
pan. Inspect oil pan for burnt oil and debris. Repair transmission as

necessary. See appropriate AUTOMATIC TRANSMISSION OVERHAUL article. If
transmission is okay, go to next step.
6) Replace governor pressure solenoid. Replace transmission
oil pan and refill fluid. Start engine. Read gauge pressure. If
pressure is less than 3 psi (.2 kg/cm
), testing is complete. If
pressure is 3 psi (.2 kg/cm) or greater, replace valve body.
7) Turn ignition off. Disconnect transmission solenoid
harness connector. Inspect connector and terminals for damage. Repair
as necessary. If connector and terminals are okay, turn ignition on.
Measure voltage between ground and 5-volt supply circuit at
transmission solenoid harness connector. If voltage is 4.5 volts or
less, repair open 5-volt supply circuit. If voltage is greater than 4.
5 volts, replace governor pressure sensor.
8) Using scan tool, read and record FREEZE FRAME data. Ensure
CAUSED BY DTC hex code matches DTC message on screen. Using wiring
diagram as a guide, inspect wiring and connectors. Repair wiring
harness as necessary. If wiring and connectors are okay, go to next
step.
9) Using scan tool, clear DTCs. Drive vehicle at 0-20 MPH and
come to complete for 20 seconds. Repeat road test 5 times. Using scan
tool, monitor governor actual pressure and target pressure. If
pressures greater than 3 psi (.2 kg/cm
) at zero MPH appears, repair
wiring harness as necessary. If pressures greater than 3 psi (.2
kg/cm
) at zero MPH do not appear, testing is complete.
DTC P1762: GOV PRESS SEN OFFSET VOLTS TOO LOW OR HIGH
Circuit Description
Circuit is monitored continuously while key is on and engine
running. Code sets if governor pressure is out of range for 1.3
seconds. Test must fail 3 times to set code.
Possible Causes
* Solenoid pack connector 5 volt supply circuit open.
* Governor pressure sensor ground circuit open.
* Governor pressure sensor wiring harness and/or connectors
defective.
* Transmission fluid burnt or oil pan has excessive debris.
Diagnostic Procedures
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step 9).
If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is
"0", go to next step.
2) Start engine and allow it to reach normal temperature.
Check transmission fluid level and condition. Correct transmission
fluid level or condition as necessary. If transmission fluid level and
condition are okay, go to next step.
3) Turn ignition off and back on. Do not start. Using scan
tool, check Park/Neutral Position (PNP) switch operation. Repair PNP
switch as necessary. If PNP switch operation is okay, go to next step.
4) Start engine. Place gear selector in Neutral. Using scan
tool, read GOV PRESSURE voltage. If voltage is not .30-.76 volt, go to
step 6). If voltage is as specified, go to next step.
5) While monitoring GOV PRESSURE sensor voltage, wiggle
connectors and wiring harness between governor pressure sensor and
PCM. If voltage changes while wiggling connectors and harness, repair
connector or harness as necessary. If voltage does not change,
conditions required to set DTC P1762 are not present at this time. DTC
P1762 sets if governor pressure sensor input is less than or greater
than a predetermined PNP switch calibration for 1.3 seconds under

predetermined conditions. Possible causes are: faulty governor
pressure sensor, shorted or open 5-volt supply circuit or faulty PCM.
Testing is complete.
6) While monitoring GOV PRESSURE sensor voltage, wiggle
connectors and wiring harness between governor pressure sensor and
PCM. If voltage changes while wiggling connectors and harness, repair
connector or harness as necessary. If voltage does not change, go to
next step.
7) Read and record FREEZE FRAME data. Turn ignition off.
Disconnect transmission solenoid harness connector. Inspect connector
and terminals for damage. Repair as necessary. If connector and
terminals are okay, turn ignition on. Measure voltage between ground
and 5-volt supply circuit at transmission solenoid harness connector.
If voltage is less than 4.5 volts, repair open 5-volt supply circuit.
If voltage is 4.5 volts or greater, go to next step.
8) Turn ignition off. Disconnect PCM harness connectors.
Inspect connectors and terminals for damage. Repair as necessary. If
connectors and terminals are okay, measure resistance of ground
circuit between transmission solenoid harness connector and Black PCM
harness connector C1. If resistance is 5 ohms or greater, repair open
ground circuit. If resistance is less than 5 ohms, go to next step.
9) Reconnect all harness connectors. Start engine. Use scan
tool to read and record FREEZE FRAME data. Erase DTCs. Start engine
and allow it to idle in Neutral or Park for 3 minutes. Read DTCs. If
DTC P1762 does not reset test is complete. If DTC P1762 resets, go to
next step.
10) Drain transmission fluid and remove oil pan. Replace
governor pressure sensor. Inspect oil pan for burnt oil and debris.
Repair transmission as necessary. See appropriate AUTOMATIC
TRANSMISSION OVERHAUL article. If transmission is okay, no problem is
found at this time. Testing is complete.
DTC P1763: GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH
Circuit Description
Circuit is monitored continuously while key is on and engine
running. Code sets if governor pressure signal voltage is greater than
4.89 volts for 8.5 seconds.
Possible Causes
* Solenoid pack connector 5 volt supply circuit open.
* Governor pressure sensor ground circuit open.
* Governor pressure sensor wiring harness and/or connectors
defective.
* Governor pressure/temperature sensor defective.
* Governor pressure sensor signal circuit short to voltage.
* Governor pressure sensor signal circuit open.
* PCM defective.
Diagnostic Procedures
1) Using scan tool read DTCs. If DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step
22). If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed
count is "0", indicating DTC still exists, go to next step.
2) Turn ignition off. Disconnect transmission solenoid
harness connector. Inspect connector and terminals for damage. Repair
as necessary. If connector and terminals are okay, turn ignition on.
Measure voltage between ground and 5-volt supply circuit at
transmission solenoid harness connector. If voltage is 4.5-5.5 volts,
go to next step. If voltage is not as specified, repair open 5-volt
supply circuit.
3) Reconnect transmission solenoid harness connector. Using

* Governor pressure sensor harness defective.
* Governor pressure/temperature sensor defective.
* Governor pressure sensor signal short to sensor ground
circuit.
* Governor pressure sensor signal circuit short to ground.
* Transmission harness/solenoid assembly defective.
* PCM defective.
* Solenoid pack connector 5-volt supply circuit open.
* Governor pressure sensor ground circuit open.
* Governor pressure sensor signal circuit short to voltage.
* Governor pressure sensor signal circuit open.
Diagnostic Procedures (AB, AN, DN & WJ Bodies)
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step
11). If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed
count is "0", go to next step.
2) Turn ignition off. Disconnect transmission solenoid
harness connector. Turn ignition on. Measure voltage between ground
and 5-volt supply circuit at transmission solenoid harness connector.
If voltage is 4.5-5.5 volts, go to next step. If voltage is not as
specified, repair open 5-volt supply circuit.
3) Reconnect transmission solenoid harness connector. Using
scan tool, read governor pressure sensor voltage. If voltage is
greater than 4.65 volts, go to test DTC P1763: GOVERNOR PRESSURE
SENSOR VOLTS TOO HIGH. If voltage is 4.65 volts or less, go to next
step.
4) If voltage is less than .12 volt, go to next step. If
voltage is not .12-.80 volt, go to next step. If voltage is not as
specified, go to step 10).
5) Turn ignition off. Disconnect PCM harness connectors.
Disconnect transmission solenoid harness connector. Inspect connectors
and terminals for damage. Repair as necessary. If connector and
terminals are okay, measure resistance between sensor ground circuit
at Black PCM harness connector C1 and governor pressure sensor signal
circuit at White PCM harness connector C2. If resistance is less than
5 ohms, repair governor pressure sensor signal circuit for short to
ground circuit. If resistance is 5 ohms or greater, go to next step.
6) Measure resistance between ground and governor pressure
sensor signal circuit at governor pressure sensor harness connector.
If resistance is less than 5 ohms, repair governor pressure sensor
signal circuit for short to ground. If resistance is 5 ohms or
greater, go to next step.
7) Reconnect transmission solenoid harness connector. Drain
transmission fluid and remove oil pan. Disconnect governor
pressure/temperature sensor harness connector. Inspect connector and
terminals for damage. Repair as necessary. If connector and terminals
are okay, measure resistance between sensor ground circuit at Black
PCM harness connector C1 and governor pressure sensor signal circuit
at White PCM harness connector C2. If resistance is less than 5 ohms,
repair or replace transmission solenoid and harness assembly. If
resistance is 5 ohms or greater, go to next step.
8) Measure resistance between ground and governor pressure
sensor signal circuit at governor pressure sensor harness connector.
If resistance is less than 5 ohms, repair or replace transmission
solenoid and harness assembly. If resistance is 5 ohms or greater, go
to next step.
9) Reconnect all harness connectors except governor
pressure/temperature sensor harness connector. Turn ignition on. Using
scan tool, read governor pressure sensor voltage. If voltage is 4.8
volts or less, replace PCM. If voltage is greater than 4.8 volts,
replace governor pressure sensor.

10) If governor pressure voltage is than .12-.80 volt, go to
next step. If governor pressure voltage is .80 volt or greater, go to
test DTC P1763B: GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH (AN & DN
BODIES).
11) Wiggle wiring harness between PCM and governor pressure
sensor while monitoring governor pressure voltage on scan tool. If
voltage changes while wiggling wiring harness, repair wiring harness
as necessary. If voltage does not change, conditions required to set
DTC P1764 are not present at this time. DTC P1764 sets if governor
pressure sensor input is less than .1 volt for 8.5 seconds. Possible
causes are: PCM internally shorted or open, incorrectly wired, dirty
or corroded connectors or open or shorted wiring. See INACTIVE DTC
CONDITION under SELF-DIAGNOSTIC SYSTEM. Testing is complete.
Diagnostic Procedures (BR Body)
1) Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step
23). If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed
count is "0", go to next step.
2) Turn ignition off. Disconnect transmission solenoid
harness connector. Inspect connector and terminals for damage. Repair
as necessary. If connector and terminals are okay, turn ignition on.
Measure voltage between ground and 5-volt supply circuit at
transmission solenoid harness connector. If voltage is 4.5-5.5 volts,
go to next step. If voltage is not as specified, repair open 5-volt
supply circuit.
3) Reconnect transmission solenoid harness connector. Using
scan tool, read governor pressure sensor voltage. If voltage is
greater than 4.65 volts, go to step 9). If voltage is less than .12
volt, go to next step. If voltage is not .12-.80 volt, go to step 23).
If voltage is .80-4.65 volts, go to step 16).
4) Check and record freeze frame data to determine conditions
which set code. Turn ignition off. Disconnect PCM harness connectors.
Disconnect transmission solenoid harness connector. Inspect connector
and terminals for damage. Repair as necessary. If connector and
terminals are okay, measure resistance between sensor ground circuit
at Black PCM harness connector C1 and governor pressure sensor signal
circuit at White PCM harness connector C2. If resistance is less than
5 ohms, repair governor pressure sensor signal circuit for short to
ground circuit. If resistance is 5 ohms or greater, go to next step.
5) Measure resistance between ground and governor pressure
sensor signal circuit at White PCM harness connector C2. If resistance
is less than 5 ohms, repair governor pressure sensor signal circuit
for short to ground. If resistance is 5 ohms or greater, go to next
step.
6) Drain transmission fluid and remove oil pan. Disconnect
pressure/temperature sensor harness connector. Inspect connector and
terminals for damage. Repair as necessary. If connector and terminals
are okay, reconnect transmission solenoid harness connector. Measure
resistance between ground circuit and governor pressure sensor signal
circuit at governor pressure sensor harness connector. If resistance
is less than 5 ohms, repair or replace transmission solenoid and
harness assembly. If resistance is 5 ohms or greater, go to next step.
7) Measure resistance between ground and governor pressure
sensor signal circuit at governor pressure sensor harness connector.
If resistance is less than 5 ohms, repair or replace transmission
solenoid and harness assembly. If resistance is 5 ohms or greater, go
to next step.
8) Reconnect all harness connectors except
pressure/temperature sensor harness connector. Turn ignition on. Using
scan tool, read governor pressure sensor voltage. If voltage is 4.8
volts or less, replace PCM. If voltage is greater than 4.8 volts,
replace pressure/temperature sensor.

19) Turn ignition on. Using scan tool, read governor pressure
sensor voltage. If voltage is 4.65 volts or less, replace PCM. If
resistance is greater than 4.65 volts, go to next step.
20) Turn ignition off. Drain transmission fluid and remove
oil pan. Disconnect pressure/temperature sensor harness connector.
Inspect connector and terminals for damage. Repair as necessary. If
connector and terminals are okay, reconnect transmission solenoid
harness connector. Measure resistance of governor pressure sensor
signal circuit between White PCM harness connector C2 and governor
pressure sensor harness connector. If resistance is greater than 5
ohms, repair or replace transmission solenoid and harness assembly. If
resistance is 5 ohms or less, go to next step.
21) Measure resistance of governor pressure sensor ground
circuit between Black PCM harness connector C1 and governor pressure
sensor harness connector. If resistance is greater than 5 ohms, repair
or replace transmission solenoid and harness assembly. If resistance
is 5 ohms or less, go to next step.
22) Turn ignition on. Measure voltage between ground and
governor pressure signal circuit at governor pressure sensor harness
connector. If voltage is greater than one volt, repair or replace
transmission solenoid and harness assembly. If voltage is one volt or
less, replace pressure/temperature sensor.
23) Check and record freeze frame data to determine
conditions which set code. Conditions required to set DTC P1764 are
not present at this time. Using wiring diagram as a guide, inspect
wiring and connectors. Repair wiring harness as necessary. If wiring
and connectors are okay, go to next step.
24) Using scan tool, clear DTCs. While reading DTCs, wiggle
wiring harness between PCM and governor pressure sensor. If DTC P1764
resets while wiggling wiring harness, repair wiring harness as
necessary. If DTC P1764 does not reset, go next step.
25) DTC P1764 sets if governor pressure sensor input is less
than .1 volt for 8.36 seconds. Possible causes are: PCM internally
shorted or open, incorrectly wired, dirty or corroded connectors or
open or shorted wiring. See INACTIVE DTC CONDITION under SELF-
DIAGNOSTIC SYSTEM. Testing is complete.
DTC P1765: TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT
Circuit Description
Circuit is monitored continuously while key is on. Code sets
if voltage on transmission control relay circuit at PCM is different
than expected voltage for 3 seconds.
Possible Causes
* Generator source circuit open.
* Transmission relay control circuit open.
* Transmission relay control circuit short to ground.
* Transmission control relay wiring harness defective.
* PCM defective.
* Transmission control relay defective.
Diagnostic Procedures
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step 9).
If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is
"0", go to next step.
2) Using scan tool, actuate transmission control relay. If
transmission control relay does not click, go to step 5). If
transmission control relay clicks, go to next step.
3) Wiggle wiring harness between transmission control relay

and PCM. Ensure scan tool is still actuating transmission control
relay. If transmission control relay stops clicking, repair wiring
harness as necessary. If transmission control relay continues
clicking, go to next step.
4) Using wiring diagram as a guide, inspect wiring and
connectors. Repair wiring harness as necessary. If wiring and
connectors are okay, see INACTIVE DTC CONDITION under SELF-DIAGNOSTIC
SYSTEM. Testing is complete.
5) Remove transmission control relay. Inspect connector and
terminals for damage. Repair as necessary. If connector and terminals
are okay, turn ignition on. Using scan tool, actuate generator field.
Measure voltage between ground and generator source circuit at
transmission control relay harness connector. If voltage is 10 volts
or less, repair open generator source circuit. If voltage is greater
than 10 volts, go to next step.
6) Turn ignition off. Measure resistance between transmission
control relay terminals No. 85 and 86. If resistance is 100 ohms or
greater, replace transmission control relay. If resistance is less
than 100 ohms, go to next step.
7) Disconnect White PCM harness connector C2. Inspect
connector and terminals for damage. Repair as necessary. If connector
and terminals are okay, measure resistance between ground and
transmission relay control circuit at White PCM harness connector C2.
If resistance is less than 5 ohms, repair short to ground in
transmission relay control circuit. If resistance is 5 ohms or
greater, go to next step.
8) Measure resistance of transmission relay control circuit
between transmission control relay connector and White PCM harness
connector C2. If resistance is 5 ohms or greater, repair open
transmission relay control circuit. If resistance is less than 5 ohms,
replace PCM.
9) Conditions required to set DTC P1765 are not present at
this time. DTC P1765 sets if transmission control relay is not in a
state requested by PCM for greater than 3 seconds. Possible causes
are: faulty relay, open or shorted control circuit, faulty PCM or
faulty connector terminals. Inspect all related wiring and connectors.
Repair as necessary. If wiring and connectors are okay, erase DTCs.
Using scan tool, read DTCs while wiggling wiring harness between
governor pressure sensor and PCM. If DTC P1765 resets, repair wiring
harness as necessary. If DTC P1765 does not reset, see INACTIVE DTC
CONDITION under SELF-DIAGNOSTIC SYSTEM. Testing is complete.
DTC P1899: P/N SWITCH STUCK IN PARK OR IN GEAR
Circuit Description
Circuit is monitored with transmission in "D", "N" or "P"
position. Code sets if PCM detects an incorrect park/neutral switch
state for any given mode of vehicle operation.
Possible Causes
* Park Neutral Position (PNP) switch wiring harness
defective.
* PNP switch sense circuit open.
* PNP switch defective.
* PNP switch sense circuit short to ground.
* PNP switch stuck.
Diagnostic Procedures (AN, DN & WJ Bodies)
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On WJ body, if DTC SPECIFIC GOOD TRIPS counter is not
displayed or displayed count is not "0", go to step 8). If DTC
SPECIFIC GOOD TRIPS counter is displayed and displayed count is "0",

go to next step.
2) Using scan tool, read PARK/NEUTRAL SWITCH input state.
Monitor scan tool while moving gear selector from Park to Reverse. If
PARK/NEUTRAL SWITCH state goes from P/N to D/R, go to next step. If
PARK/NEUTRAL SWITCH state does not go from P/N to D/R, go to step 4).
3) Inspect all related wiring and connectors. Repair as
necessary. If wiring is okay, see INACTIVE DTC CONDITION under SELF-
DIAGNOSTIC SYSTEM. Testing is complete.
4) Turn ignition off. Disconnect PCM harness connectors.
Inspect connector and terminals for damage. Repair as necessary. If
connector and terminals are okay, measure resistance between ground
and Park Neutral Position (PNP) switch sense circuit at Black PCM
harness connector C1 while moving gear selector from Park to Reverse
and back to Park. If resistance changes from less than 10 ohms to
greater than 10 ohms, replace PCM. If resistance does not change as
specified, go to next step.
5) If resistance is less than 10 ohms at all times, go to
next step. If resistance is not as specified, go to step 7).
6) Disconnect PNP switch harness connector. Measure
resistance between ground and PNP switch sense circuit at PNP switch
harness connector. If resistance is less than 5 ohms, repair PNP
switch sense circuit for a short to ground. If resistance is not as
specified, replace PNP switch.
7) Disconnect PNP switch harness connector. Measure
resistance of PNP switch sense circuit between Black PCM harness
connector C1 and PNP switch harness connector. If resistance is less
than 5 ohms, replace PNP switch. If resistance is not as specified,
repair open in PNP switch sense circuit.
8) Conditions required to set DTC P1899 are not present at
this time. DTC P1899 sets if PCM detects an incorrect Park Neutral
Position (PNP) switch state for a given mode of vehicle operation.
Possible causes are: faulty connections, faulty PNP switch, mechanical
transmission problem or PCM failure. Inspect all related wiring and
connectors. Repair as necessary. If wiring is okay, see INACTIVE DTC
CONDITION under SELF-DIAGNOSTIC SYSTEM. Testing is complete.
Diagnostic Procedures (AB & BR Bodies)
1) Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step 7).
If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is
"0", go to next step.
2) Using scan tool, check and record FREEZE FRAME data. Use
FREEZE FRAME data to determine conditions when DTC P1899 was set. Turn
ignition on. Using scan tool, read PARK/NEUTRAL SWITCH input state.
Monitor scan tool while moving gear selector from Park to Reverse. If
PARK/NEUTRAL SWITCH state goes from P/N to D/R, go to step 7). If
PARK/NEUTRAL SWITCH state does not go from P/N to D/R, go to next
step.
3) Turn ignition off. Disconnect PCM harness connectors.
Inspect connector and terminals for damage. Repair as necessary. If
connector and terminals are okay, measure resistance between ground
and Park Neutral Position (PNP) switch sense circuit at Black PCM
harness connector C1 while moving gear selector from Park to Reverse
and back to Park. If resistance changes from less than 10 ohms to
greater than 10 ohms, replace PCM. If resistance does not change as
specified, go to next step.
4) If resistance is less than 10 ohms at all times, go to
next step. If resistance is not as specified, go to step 6).
5) Disconnect PNP switch harness connector. Measure
resistance between ground and PNP switch sense circuit at PNP switch
harness connector. If resistance is less than 5 ohms, repair PNP
switch sense circuit for a short to ground. If resistance is not as
specified, replace PNP switch.

TRIP COUNTER displays "0", return to appropriate test(s). If DTC
SPECIFIC GOOD TRIP COUNTER displays one or more, repair is complete.
Go to step 9).
3) If coming to this test from a mis-fire DTC test, go step
7). If coming to this test from other than a mis-fire DTC test, use
scan tool to monitor pretest enabling conditions until all conditions
have been met. Once all enabling conditions are met, observe
appropriate monitor for DTC on scan tool and go to next step.
4) Using scan tool, monitor SIMILAR CONDITIONS to attempt to
duplicate conditions that vehicle was operating at when DTC was set.
If conditions can be duplicated, GOOD TRIP COUNTER will change to one
or more. Monitor operation may be observed on scan tool. All specified
enabling conditions for specified DTC must be met before PCM will
operate monitor. Go to next step.
5) Turn ignition off for 10 seconds. Start engine and allow
it to idle for 2 minutes while monitoring scan tool. If STARTS SINCE
SET and DTC SPECIFIC GOOD TRIP COUNTER change to one or more, repair
is complete. Go to step 9). If STARTS SINCE SET and DTC SPECIFIC GOOD
TRIP COUNTER do not change to one or more, go to next step.
6) Using scan tool, read DTCs. If any DTC exists, return to
appropriate test(s). If no other DTC exists, go to next step.
7) Using scan tool, monitor SIMILAR CONDITIONS to attempt to
duplicate conditions that vehicle was operating at when DTC was set.
If conditions can be duplicated, MISFIRE GOOD TRIP COUNTER will change
to one or more. If MISFIRE GOOD TRIP COUNTER changes to one or more,
test is complete. Go to step 9). If MISFIRE GOOD TRIP COUNTER does not
change to one or more, go to next step.
8) Using scan tool, read DTCs. If any DTC exists, return to
appropriate test(s). If no other DTC exists, go to next step.
9) Turn ignition on, with engine off. Using scan tool, erase
DTCs. Turn ignition off. Disconnect scan tool. Test is complete.
REMOVAL & INSTALLATION
GOVERNOR PRESSURE SENSOR, GOVERNOR PRESSURE SOLENOID &
TRANSMISSION FLUID TEMPERATURE SENSOR
NOTE: Transmission fluid temperature sensor is integral with
governor pressure sensor.
Removal
1) Raise and support vehicle. Drain transmission fluid.
Remove transmission oil pan and filter. Disconnect harness connectors
from governor pressure solenoid and sensor.
2) Remove pressure solenoid retainer-to-governor body screws.
Separate solenoid retainer from governor and pull solenoid from
governor body.
3) Remove governor body-to-valve body bolts. Separate
governor body from valve body. Remove governor body and gasket. Remove
retainer clip holding pressure sensor to governor body and remove
pressure sensor.
Installation
1) Clean all gasket surfaces. Lubricate NEW "O" ring with ATF
and install on pressure sensor. Push pressure sensor into governor
body and install retainer clip. Position governor body on valve body
with NEW gasket and install governor body-to-valve body bolts.
2) Lubricate NEW "O" ring with ATF and install on pressure
solenoid. Push solenoid into governor body. Install solenoid retainer.
Reconnect harness connectors to pressure solenoid and sensor. To
complete installation, reverse removal procedure.