check engine CHRYSLER VOYAGER 2001 Service Manual

Symptom:
P1791-LOSS OF PRIME
When Monitored and Set Condition:
P1791-LOSS OF PRIME
When Monitored: If the transmission is slipping in any forward gear and the pressure
switches are not indicating pressure, a loss of prime test is run.
Set Condition: If the Trans. begins to slip in a forward gear & the press. switch(s) that
should be closed are open a loss of prime test begins. Available elements are turned on by
the TCM to see if pump prime exists.The code sets if no pressure switches respond.
POSSIBLE CAUSES
PLUGGED TRANSMISSION OIL FILTER
SHIFT LEVER POSITION
TRANSMISSION FLUID LEVEL
INTERMITTENT WIRING AND CONNECTORS
TRANSMISSION OIL PUMP
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTC's. Check and repair all engine DTC's prior
to performing Transmission Symptom Diagnostics.
With the DRBIIIt, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0705 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB's related to the symptom.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
124
TRANSMISSION

TEST ACTION APPLICABILITY
2 The Transmission Fluid temperature must be above 21É C or 70É F prior to checking
fluid level. Adjusting fluid level on a cold transmission will result in an overfilled
transmission.
Check the Transmission Fluid Level per the Service Information.
Is the Transmission Fluid Level at the proper level?All
Ye s®Go To 3
No®If the Transmission Fluid is low, repair any Transmission Fluid
leak as necessary and adjust the Transmission Fluid Level in
accordance with the Service Information.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
3 Place the gear selector in park.
Start the engine.
The Transmission must be at operating temperature prior to checking pressure. A
cold Transmission will give higher readings.
Place the Transmission in Reverse.
With the DRBIIIt, observe the Transmission Pressure Switch states.
Are any of the Pressure Switches closed?All
Ye s®Go To 4
No®Go To 6
4 The conditions necessary to set this DTC are not present at this time.
Test drive the vehicle. Allow the Transmission to shift through all gears and ranges.
Did you experience any Delayed Engagement and/ or No Drive condition?All
Ye s®Go To 6
No®Go To 5
5 The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Test Complete.
6 Remove and inspect the Transmission Oil Pan and Transmission Oil Filter per the
Service Information.
Does the Transmission Oil Pan contain excessive debris and/or is the Oil Filter
plugged?All
Ye s®Repair the cause of plugged Transmission Oil Filter. Refer to the
Service Information for repair procedures.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 7
7 With the DRBIIIt, perform a Shift Lever Position test. Follow the instructions on the
DRBIIIt.
Did the Shift Lever Position Test pass?All
Ye s®Go To 8
No®Refer to symptom list and perform test for DTC P0705.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
125
TRANSMISSION
P1791-LOSS OF PRIME ÐContinued

Symptom:
P1792-BATTERY WAS DISCONNECTED
When Monitored and Set Condition:
P1792-BATTERY WAS DISCONNECTED
When Monitored: Whenever the key is in the Run/Start position.
Set Condition: This code is set whenever Transmission Control Module (TCM) is
disconnected from battery power B+ or ground. It will also be set during the DRBIIIt
Quick Battery Disconnect procedure.
POSSIBLE CAUSES
QUICK LEARN WAS PERFORMED
RECENT BATTERY DISCONNECTION
TCM WAS REPLACED OR DISCONNECTED
INTERMITTENT WIRING AND CONNECTORS
FUSED B+ CIRCUIT TO TCM OPEN
GROUND CIRCUIT OPEN
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTC's. Check and repair all engine DTC's prior
to performing Transmission Symptom Diagnostics.
With the DRBIIIt, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0705 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB's related to the symptom.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
127
TRANSMISSION

TEST ACTION APPLICABILITY
2 Turn ignition off to the lock position.
Disconnect the TCM harness connector.
Ignition on, engine not running.
Measure the voltage of the Fused B+ circuit in the TCM harness connector.
Is the voltage below 10.0 volts?All
Ye s®Go To 3
No®Go To 5
3 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, check the Fused B+ circuit in the TCM
harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?All
Ye s®Go To 4
No®Repair the Fused B+ circuit for a open or high resistance. If the
fuse is open make sure to check for a short to ground.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
4 Turn ignition off to the lock position.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Using a 12-volt test light connected to 12-volts, check all the ground circuits in the
TCM harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the light illuminate brightly at all ground circuits?All
Ye s®Test Complete.
No®Repair the Ground circuit(s) as necessary.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
5 Has the Quick Learn procedure been performed? All
Ye s®This is the cause of the DTC. Erase the DTC and return vehicle to
customer.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 6
6 Has the battery been disconnected, lost it's charge, or been replaced recently? All
Ye s®This is the cause of the DTC. Erase the DTC and return vehicle to
customer.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 7
7 Has the TCM been replaced or disconnected? All
Ye s®Replacing or disconnecting the TCM will set this DTC. Erase the
DTC and return the vehicle to the customer.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 8
128
TRANSMISSION
P1792-BATTERY WAS DISCONNECTED ÐContinued

Symptom:
P1793-TRD LINK COMMUNICATION ERROR
When Monitored and Set Condition:
P1793-TRD LINK COMMUNICATION ERROR
When Monitored: The transmission controller pulses the 12 volt TRD signal from the
PCM to ground, during torque managed shifts with the throttle angle above 54 degrees.
The TRD system is also tested whenever the vehicle is stopped and the engine speed is at
idle.
Set Condition: This code is set when the Transmission Control Module (TCM) sends two
subsequent torque reduction messages to the Powertrain Control Module (PCM) via the
TRD link circuit and does not receive a confirmation from the PCM over the communica-
tion bus.
POSSIBLE CAUSES
RELATED DTC'S PRESENT
INTERMITTENT WIRING AND CONNECTORS
TORQUE MANAGEMENT REQUEST SENSE CIRCUIT OPEN
TORQUE MANAGEMENT REQUEST SENSE SHORT TO GROUND
TORQUE MANAGEMENT REQUEST SENSE CIRCUIT SHORT TO VOLTAGE
PCM - TRD LINK
TCM - TRD LINK
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTC's. Check and repair all engine DTC's prior
to performing Transmission Symptom Diagnostics.
With the DRBIIIt, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0705 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB's related to the symptom.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
130
TRANSMISSION

TEST ACTION APPLICABILITY
2 With the DRBIIIt, read Transmission DTC's.
Are any of the following DTCs P1716, P0731, P0732, P0733, P0734, P1736 present
also?All
Ye s®If any of these codes are present, disregard the P1793 DTC and
refer to the symptom list for the other DTC'(s).
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 3
3 With the DRBIIIt, Check the STARTS SINCE SET counter.
Note: This counter only applies to the last DTC set.
Is the STARTS SINCE SET equal to 0?All
Ye s®Go To 4
No®Go To 9
4 Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Torque Management Request Sense circuit from the
TCM harness connector to the PCM harness connector.
Is the resistance above 5.0 ohms?All
Ye s®Repair the Torque Management Request Sense circuit for an
open.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 5
5 Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the Torque Management Request Sense
circuit.
Is the resistance below 5.0 ohms?All
Ye s®Repair Torque Management Request Sense circuit for a short to
ground.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 6
6 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Ignition on, engine not running.
Measure the voltage of the Torque Management Request Sense circuit in the TCM
harness connector.
Is the voltage above 10.5 volts?All
Ye s®Repair Torque Management Request Sense circuit short to volt-
age.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 7
131
TRANSMISSION
P1793-TRD LINK COMMUNICATION ERROR ÐContinued

TEST ACTION APPLICABILITY
7 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Ignition on, engine not running.
Measure the voltage of the Torque Management Request Sense circuit in the TCM
harness connector.
Is the voltage above 7.0 volts?All
Ye s®Replace the TCM. WITH THE DRBIIItPERFORM QUICK
LEARN AND REPROGRAM PINION FACTOR.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 8
8 If there are no possible causes remaining, view repair. All
Repair
Replace the Powertrain Control Module. Replace and program the
PCM Module in accordance with the Service Information.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
9 The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Test Complete.
132
TRANSMISSION
P1793-TRD LINK COMMUNICATION ERROR ÐContinued

Symptom:
P1794-SPEED SENSOR GROUND ERROR
When Monitored and Set Condition:
P1794-SPEED SENSOR GROUND ERROR
When Monitored: The transmission gear ratio is monitored continuously while the
transmission is in gear.
Set Condition: After a TCM reset in neutral and Input/Output equals a ratio of input to
output of 2.50
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
SPEED SENSOR GROUND CIRCUIT OPEN
TCM - SPEED SENSOR GROUND
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTC's. Check and repair all engine DTC's prior
to performing Transmission Symptom Diagnostics.
With the DRBIIIt, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0705 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB's related to the symptom.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
2 Start the engine in park.
With the DRBIIIt, observe the Input and Output Speed Sensor readings.
Is the Output Speed Sensor reading twice the Input Speed Sensor reading?All
Ye s®Go To 4
No®Go To 3
133
TRANSMISSION

TEST ACTION APPLICABILITY
3 The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?All
Ye s®Repair as necessary.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 4
4 Turn ignition off to the lock position.
CAUTION: Remove the Starter Relay from the IPM. This will prevent the
vehicle from being started in gear.
Install Transmission Simulator, Miller tool #8333 and the FWD Adapter Cable kit,
Miller tool #8333-1.
Ignition on, engine not running.
Using the Transmission Simulator, set the selector switch to the 3000/1250 position.
Turn the Input/Output switch to ON.
With the DRBIIIt, read the Input and Output Speed Sensor RPM.
Does the Input Speed read 3000 RPM and the Output Speed read 1250 RPM within
50 RPM?All
Ye s®Go To 5
No®Go To 5
5 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the TRS harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Input Speed Sensor Ground circuit from the TCM
harness connector to the Speed Sensor harness connector.
Is the resistance above 5.0 ohms?All
Ye s®Repair the Speed Sensor Ground circuit for an open or high
resistance..
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Go To 6
6 If there are no possible causes remaining, view repair. All
Repair
Replace the TCM. WITH THE DRBIIItPERFORM QUICK
LEARN AND REPROGRAM PINION FACTOR.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
134
TRANSMISSION
P1794-SPEED SENSOR GROUND ERROR ÐContinued

Symptom:
P1797-MANUAL SHIFT OVERHEAT
When Monitored and Set Condition:
P1797-MANUAL SHIFT OVERHEAT
When Monitored: Whenever engine is running and transmission is in the AutoStick
mode.
Set Condition: If the engine temperature exceeds 255 deg. F or the transmission
temperature exceeds 275 deg. F while in AutoStick mode. note: Aggressive driving or
driving in low for extended periods of time in AutoStick mode will set this code.
POSSIBLE CAUSES
MANUAL SHIFT OVERHEAT
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many Transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTC's. Check and repair all engine DTC's prior
to performing Transmission Symptom Diagnostics.
With the DRBIIIt, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0705 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Transmission Control Module. Some problems
are corrected by software upgrades to the Transmission Control Module.
NOTE: Check for applicable TSB's related to the symptom.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
2 This is an informational DTC only.
Check the Engine and Transmission Cooling Systems for proper operation.
Check the Radiator Cooling Fan operation.
Check the Transmission Cooling Fan operation if equipped.
Check the Transmission Fluid Level. Make sure it is not overfilled.
NOTE: Aggressive driving or driving in low for extended periods of time in
Autosticktmode will set this DTC.
Were there any problems found?All
Ye s®Repair as necessary.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
No®Test Complete.
139
TRANSMISSION