ISUZU AXIOM 2002 Service Repair Manual

7A1±24
TRANSMISSION CONTROL SYSTEM (4L30±E)
Diagnostic Trouble Code (DTC)
Identification
DTC
NUMBERDTC NAMEDTC TYPEMIL ªCHECK
ENGINEºªCHECK
TRANSº
P0218Transmission Fluid Over TemperatureD
P0705Transmission Range Switch (Mode Switch) Illegal
PositionD
P0706Transmission Range Switch (Mode Switch)
PerformanceD
P0711Transmission Fluid Temperature (TFT) Sensor
PerformanceD
P0712Transmission Fluid Temperature (TFT) Sensor
Circuit Low InputD
P0713Transmission Fluid Temperature (TFT) Sensor
Circuit High InputD
P0719Brake Switch Circuit Low (Stuck On)D
P0722Automatic Transmission Output Speed Sensor
(OSS) Low InputBONFlash
P0723Automatic Transmission Output Speed Sensor
(OSS) IntermittentBONFlash
P0724Brake Switch Circuit High (Stuck Off)D
P0730Gear Error Without Input SpeedCFlash
P0742Torque Converter Clutch (TCC) System Stuck OnBONFlash
P0748Pressure Control Solenoid (PCS) (Force Motor)
Circuit ElectricalCFlash
P0751Shift Solenoid A Performance (Stuck Off)BONFlash
P0752Shift Solenoid A Performance (Stuck On)BONFlash
P0753Shift Solenoid A ElectricalBONFlash
P0756Shift Solenoid B Performance (Stuck Off)BONFlash
P0757Shift Solenoid B Performance (Stuck On)BONFlash
P0758Shift Solenoid B ElectricalBONFlash
P1850Brake Band Apply Solenoid MalfunctionD
P1860TCC Solenoid ElectricalBONFlash
P1870Transmission Component Slipping (TCC Stuck
Off)BONFlash
DTC TYPEDEFINITION
BEmission related, turn on MIL (Check Engine) and flashing Check Trans after 2 consecutive trips
(Removal to confirmed)
CNon±emission related, flashing Check Trans on 1st failure
DNon±emission related, no lamps

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±25
DTC P0218 Transmission Fluid Over Temperature
D07R200004
Circuit Description
The Transmission Fluid Temperature (TFT) sensor is a
thermister that controls the signal voltage to the PCM.
The PCM supplies a 5±volt reference to the sensor on
circuit RED/BLK. When the transmission fluid is cold, the
sensor resistance is high and the PCM will sense high
signal voltage. As the fluid temperature warms to a
normal transmission operating temperature of 100
C
(212
F), the sensor resistance becomes less and the
voltage decreases to 1.5 to 2.0 volts.
This DTC detects a high transmission temperature for a
long period of time. This is a type ªDº DTC.
Conditions For Setting The DTC

No TFT DTCs P0712 or P0713.

TFT is greater than 135
C (275
F).

All conditions met for 21 seconds.
Action Taken When The DTC Sets

Hot mode TCC Shift Pattern.

The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).

ATF Lamp ON. (TFT is greater than 145
C (293
F))

Disable E±side TCC OFF request.
Conditions For Clearing The DTC

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warm±up cycles without a failure
reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connections at
the PCM and transmission 7-way connector. Look
for possible bent, backed out, deformed or damaged
terminals. Check for weak terminal tension as well.
Also check for a chafed wire that could short to bare
metal or other wiring. Inspect for a broken wire inside
the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.

Check harness routing for a potential short to ground
in circuit RED/BLK.

Scan tool TFT sensor temperature should rise
steadily to about 100
C (212
F), then stabilize.

Check for a ªskewedº (mis±scaled) sensor by
comparing the TFT sensor temperature to the
ambient temperature after a vehicle cold soak. A
ªskewedº sensor can cause delayed garage shifts or
TCC complaints.

Check for a possible torque converter stator problem.

Verify customer driving habits, trailer towing, etc.
Test Description
The numbers below refer to the step numbers on the
diagnostic chart.
3. This test checks for a ªskewedº sensor or shorted
circuit.
4. This test simulates a TFT DTC P0713.

7A1±26
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0218 Transmission Fluid Over Temperature
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
2Perform the following checks:

Check for possible engine system problems.

Transmission fluid checking procedure. Refer to
Checking
Transmission Fluid Level and Condition in Automatic
Transmission (4L30±E) Section.
Were the checks performed?Go to Step 3Ð
31. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Is the TFT sensor signal voltage less than 1.54 volts?
Go to Step 4
Go to Diagnostic
Aids
41. Turn the ignition ªoffº.
2. Disconnect the transmission 7±way connector E±42
(additional DTCs may set).
3. With the engine ªoffº, turn the ignition switch ªonº.
Is the TFT sensor signal voltage greater than 4.92 volts?
Go to Internal
Wiring Harness
Check
Go to Step 5
5Inspect/repair circuit RED/BLK for a short to ground.
Was a problem found?
Go to Step 7Go to Step 6
61. Inspect the PCM for poor connections.
2. Replace the PCM if no poor connections were found.
Is the replacement complete?
Go to Step 7Ð
71. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
TFT is less than 125
C (257
F) for at least 10 seconds.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±27
DTC P0705 Transmission Range Switch (Mode Switch) Illegal Position
D07R200005
Circuit Description

The range switch supplies the Powertrain Control
Module (PCM) with information regarding the selector
lever position: P, R, N, D, 3, 2 or L. The selector lever
position is indicated by the state of four ON/OFF
contacts. The range switch is located on one side of
the transmission. It is on the transmission manual
shaft and is fixed to the main case.

The range switch is also used to provide the
information P or N to the engine crank wiring. The
engine can be cranked only if connector E±41
terminal 4(H) is connected to terminal 1(E) which is
connected to ground.

The range switch is also used to provide the backup
lamp power in reverse. This is the reason why the
range switch is supplied through a 15A fuse (TURN,
BACK UP). This fuse can burn due to a short circuit in
the back up lamp.
This DTC detects when a fuse is open or the range switch
circuit does not work. This is a type ªDº DTC.
Conditions For Setting The DTC

Range switch illegal positions met for 5 seconds.
Action Taken When The DTC Sets

Default to D position.

Inhibit torque management.

Maximum line pressure.
Turn Force Motor OFF.

The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).
Conditions For Clearing The DTC

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Refer to accompanying chart for the normal range
signals and the illegal combinations.

Inspect the wiring for poor electrical connections at
the PCM and at the transmission 8±way connector.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as well. Also check for a chafed wire that could short
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.

Refer to the
ªRange Switch Logic Tableº for further
information.

7A1±28
TRANSMISSION CONTROL SYSTEM (4L30±E)
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
3. This test checks the indicated range signal to the
manual valve actually selected.
6. This test checks for continuity between each
selected range switch connector terminals.
Range Switch Logic Table
Range
Range Switch Ping
PositionABCP(G)
ParkONOFFOFFON
ReverseONONOFFOFF
NeutralOFFONOFFON
D4OFFONONOFF
D3ONONONON
2ONOFFONOFF
LOFFOFFONON
IllegalOFFOFFOFFOFF
IllegalOFFOFFOFFON

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±29
DTC P0705 Transmission Range Switch (Mode Switch) Illegal Position
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
2Perform the following checks:

The transmission linkage from the select lever to the manual
valve is adjusted properly.

Diagnostic circuit check.
Were the checks performed?
Go to Step 3Ð
31. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. Select each transmission range: DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the scan tool
ªRange Switchº display?
Go to Diagnostic
Aids
Go to Step 4
4Are all range switch pin displays incorrect?Go to Step 5Go to Step 6
5Check fuse and wiring to the 8±way connector terminal 5(D) for
opens.
Refer to
Mode Switch in Automatic Transmission (4L30±E)
section.
If no problem was found, replace the range switch.
Is the replacement complete?
Go to Step 9Ð
61. Disconnect the 8±way range switch connector.
2. Using ohmmeter, check continuity between terminal 5(D) and
respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8±way
range switch connector.
3. Move shift selector lever through all positions and compare
results with ªRange Switch Logic Tableº.
Is one range switch pin display incorrect?
Go to Step 7Go to Step 8
7Check the affected wiring and connector, and repair.
Is the repair complete?
Go to Step 9Ð
8Check the Powertrain Control Module (PCM) connectors for poor
connection.
If no problem was found, replace the PCM.
Is the replacement complete?
Go to Step 9Ð
91. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and road test the vehicle.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table

7A1±30
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0706 Transmission Range Switch (Mode Switch) Performance
D07R200005
Circuit Description

The range switch supplies the Powertrain Control
Module (PCM) with information regarding the selector
lever position: P, R, N, D, 3, 2 or L. The selector lever
position is indicated by the state of four ON/OFF
contacts. The range switch is located on one side of
the transmission. It is on the transmission manual
shaft and is fixed to the main case.

The range switch is also used to provide the
information P or N to the engine crank wiring. The
engine can be cranked only if connector E±41
terminal 4(H) is connected to terminal 1(E) which is
connected to ground.

The range switch is also used to provide the back up
lamp power in reverse. This is the reason why the
mode switch is supplied through a 15A fuse (TURN,
BACK UP). This fuse can burn due to a short circuit in
the back up lamp.

This DTC detects an invalid state of the range switch
or the range switch circuit by deciphering the range
switch inputs. This is a type ªDº DTC.
Conditions For Setting The DTC
This DTC will set if any of the following conditions occurs:
Condition 1 (ªRº bad position):

Engine is running.

No output speed DTCP0722, P0723.
Output speed greater than 3,200 RPM.

Range switch indicates ªRº.

All conditions met for 4 seconds.
Condition 2 (ªPº or ªNº bad position):

Engine is running.

No TPS codes.

Engine speed is less than 3,000 RPM.

TP angle is greater than 20%.

Range switch indicates ªPº or ªNº.

All conditions met for 4 seconds.
Action Taken When The DTC Sets

Default to ªDº position.

The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).
Conditions For Clearing The DTC

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±31
Diagnostic Aids

Refer to the accompanying chart for the normal range
signals and the illegal combinations.

Inspect the wiring for poor electrical connections at
the PCM and at the transmission 8±way connector.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as well. Also check for a chafed wire that could short
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.

Refer to the
ªRange Switch Logic Tableº for further
information.
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
3. This test checks the indicated range signal to the
manual valve actually selected.
6. This test checks for continuity between each
selected range switch connector terminals.
Range Switch Logic Table
Range
Range Switch Ping
PositionABCP(G)
ParkONOFFOFFON
ReverseONONOFFOFF
NeutralOFFONOFFON
D4OFFONONOFF
D3ONONONON
2ONOFFONOFF
LOFFOFFONON
IllegalOFFOFFOFFOFF
IllegalOFFOFFOFFON

7A1±32
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0706 Transmission Range Switch (Mode Switch) Performance
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
2Perform the following checks:

The transmission linkage from the select lever to the manual
valve is adjusted properly.

Diagnostic circuit check.
Were the checks performed?
Go to Step 3Ð
31. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. Select each transmission range: DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the scan tool
ªRange Switchº display?
Go to Diagnostic
Aids
Go to Step 4
4Are all range switch pin displays incorrect?Go to Step 5Go to Step 6
5Check fuse and wiring to the 8±way connector terminal 5(D) for
opens.
Refer to
Mode Switch in Automatic Transmission (4L30±E)
section.
If no problem was found, replace the range switch.
Is the replacement complete?
Go to Step 9Ð
61. Disconnect the 8±way range switch connector.
2. Using ohmmeter, check continuity between terminal 5(D) and
respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8±way
range switch connector.
3. Move shift selector lever through all positions and compare
results with ªRange Switch Logic Tableº.
Is one range switch pin display incorrect?
Go to Step 7Go to Step 8
7Check the affected wiring and connector, and repair.
Is the repair complete?
Go to Step 9Ð
8Check the Powertrain Control Module (PCM) connectors for poor
connection.
If no problem was found, replace the PCM.
Is the replacement complete?
Go to Step 9Ð
91. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and road test the vehicle.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±33
DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance
D07R200004
Circuit Description
The TFT sensor is a thermister that controls the signal
voltage to the PCM. The PCM supplies a 5 volt reference
signal to the sensor on circuit RED/BLK. When the
transmission fluid is cold, the sensor resistance is high
and the PCM detects high signal voltage. As the
transmission fluid temperature increases to normal
operating temperature of 100
C (212
F), the sensor
resistance becomes less and the voltage decreases to
1.5 to 2 volts.
When the PCM detects a TFT sensor that remains at the
startup value, or a sensor that has a change delta of
greater than 20
C (36
F) less than 1 second, DTC P0711
sets. DTC P0711 is a type D.
Conditions For Setting The DTC

No VSS DTCs P0722 or P0723.

No Transmission Component Slipping DTC P1870.

Engine is running.

TFT is between 20 A/D (Analog/Digital) counts and
248 A/D counts.

TFT is between ±40
C (±40
F) and +21
C (69.8
F)
at engine startup.

Engine coolant temperature is greater than 70
C
(150
F).

Engine coolant temperature has changed by greater
than 50
C (90
F) since engine startup.

Vehicle speed has been greater than 5 mph for
greater than 410 seconds since engine startup
(cumulative timer).

TCC slip speed has been greater than 120 rpm for
greater than 410 seconds since engine startup
(cumulative timer).

Battery voltage is between 10 and 16 volts.
All of the above is true and either of the following occurs:

If the sensor is stuck, the TFT has not changed for
greater than 2 counts (from startup temperature) for
greater than 410 seconds.
If the sensor shows an unrealistic change, the TFT
exhibits a change delta of greater than 20
C (36
F),
greater than 14 times in 7 seconds.
Action Taken When The DTC Sets

Transmission default temperature will be:
80
C (176
F) if engine temperature code is set.
100
C (212
F) if engine temperature is warm.
80
C (176
F) if engine run time is greater than 5
minutes.
21
C (69.8
F) if engine run time is less than 5
minutes.

The PCM will not illuminate the Malfunction Indicator
Lamp (MIL).
Conditions For Clearing The DTC

The DTC can be cleared from the PCM history by
using a scan tool.

The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled ªoffº
long enough to power down the PCM.
Diagnostic Aids

Inspect the wiring for poor electrical connection at the
PCM. Inspect the wiring for poor electrical
connections at the transmission 7-way connector.
Look for the following conditions:
a. A bent terminal
b. A backed out terminal
c. A damaged terminal
d. Poor terminal tension
e. A chafed wire
f. A broken wire inside the insulation