Jeep XJ. Manual — part 891
TEST
ACTION
APPLICABILITY
12
Turn ignition off to the lock position.
Disconnect the Output Speed Sensor harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance across the Output Speed Sensor terminals.
NOTE: The Input Speed Sensor resistance will vary depending on temper-
ature.
NOTE: The resistance specification is 620.0 ohms at 20°Celsius 68°Fahren-
heit.
Is the resistance between 500.0 and 700.0 ohms?
All
Yes
→
No
→
Replace the Output Speed Sensor.
Perform AW4 TRANS VERIFICATION TEST-VER1.
13
If there are no possible causes remaining, view repair.
All
Repair
Replace the TCM.
Perform AW4 TRANS VERIFICATION TEST-VER1.
33
TRANSMISSION
P0720-OUTPUT SHAFT SPEED SENSOR ERROR —
Continued
Symptom:
P0740-SOLENOID C FUNCTIONAL FAULT
When Monitored and Set Condition:
P0740-SOLENOID C FUNCTIONAL FAULT
When Monitored:
Continuously with Solenoid C (TCC) energized.
Set Condition:
When the solenoid is energized and the Engine RPM does not equal the
Transmission’s Input Speed RPM or when the solenoid is deenergized and the Engine RPM
equals Transmission input RPM.
POSSIBLE CAUSES
TPS DTC P0122 PRESENT IN THE TCM
TPS DTC’S PRESENT IN THE PCM
TCM DTC’S P1748 AND/OR P1749 PRESENT
INTERMITTENT WIRING AND/OR CONNECTORS
TRANSMISSION OIL BURNT AND/OR CONTAINS EXCESSIVE DEBRIS
INTERNAL TRANSMISSION
TEST
ACTION
APPLICABILITY
1
NOTE: Always perform diagnostics with a fully charged battery to avoid
diagnosing false symptoms.
NOTE: 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.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Verify the brake switch input to the TCM is working correctly.
Perform the shift lever position test and adjust the linkage if necessary.
Test drive vehicle to verify customer complaint.
With the DRBIII
t, read the PCM DTC’s. Check and repair all PCM DTC’s before
performing transmission diagnostics.
With the DRBIII
t, read the TCM DTC’s.
Note: Check 1 trip failures and diagnose them as DTC’s (Hard codes)
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 controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for applicable TSB’s related to the problem.
Perform this procedure prior to symptom diagnosis.
All
Continue
34
TRANSMISSION
TEST
ACTION
APPLICABILITY
2
When monitored: Continuously with the Torque Convertor Clutch Solenoid (Solenoid
C) energized.
When set: When the solenoid is energized and the Engine RPM does not equal the
Transmission’s Input Speed RPM or when the solenoid is deenergized and the Engine
RPM equals Transmission input RPM.
This is the When monitored / When set conditions for DTC P0740.
All
Continue
3
With the DRBIII
t, erase DTC’s.
Test drive the vehicle.
Maintain a steady speed of 55 MPH for 30 seconds.
Bring the vehicle slowly to a complete stop.
NOTE: Check shift patterns while the vehicle is upshifting and downshift-
ing.
Did Solenoid C (TCC) engage properly during the test drive?
All
Yes
→
No
→
4
Using the when monitored / when set conditions, attempt to reset the DTC. If the
DTC can be reset return to the symptom list and perform the appropriate diagnostic
test.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
NOTE: Check the Technical Service Bulletins.
Were any problems found?
All
Yes
→
Repair the wiring and/or connectors as necessary.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
Test Complete.
5
With the DRBIII
t, read Transmission DTC’s.
Is P-0122 Throttle Position Sensor DTC present?
All
Yes
→
Refer to the Transmission category and perform the appropriate
TCM Throttle Position DTC diagnostic before continuing.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
6
With the DRBIII
t, read the PCM DTC’s.
Is there a TPS DTC present?
All
Yes
→
Refer to the Driveability category and perform all the appropriate
PCM Throttle Position DTC’s diagnostic’s before continuing.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
7
With the DRBIII
t, read TCM DTC’s.
Is there a DTC P1748 and/or P1749 present?
All
Yes
→
If P1748 or P1749 are present refer to the transmission category
and perform the appropriate symptom. If both DTC’s are present
perform test P1749 first. If the problem is still present, perform
the diagnostic test P1748.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
35
TRANSMISSION
P0740-SOLENOID C FUNCTIONAL FAULT —
Continued
TEST
ACTION
APPLICABILITY
8
Turn ignition off to the lock position.
Remove the transmission oil pan per the service information.
Inspect the pan and fluid for excessive debris or friction material.
Is the oil burnt and/or does the pan contain excessive debris or friction material.
All
Yes
→
Repair internal transmission problem.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
9
Turn ignition off to the lock position.
Replace Solenoid C.
With the DRBIII
t, erase DTC’s.
Test drive the vehicle, maintain a steady speed of 55 MPH for at least 30 seconds.
Slowly come to a complete stop.
NOTE: Check the shift patterns while the vehicle is upshifting and down-
shifting.
Is the problem repaired?
All
Yes
→
Test Complete.
No
→
Repair internal transmission problem as necessary.
Perform AW4 TRANS VERIFICATION TEST-VER1.
36
TRANSMISSION
P0740-SOLENOID C FUNCTIONAL FAULT —
Continued
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