Jeep XJ. Manual — part 892
Symptom:
P0751-SOLENOID A FUNCTION FAULT
When Monitored and Set Condition:
P0751-SOLENOID A FUNCTION FAULT
When Monitored:
Continually while the vehicle is at high vehicle speeds and higher
engine load conditions.
Set Condition:
The gear ratio is incorrect for the current gear requested. The vehicle
must be driven on the road to set the DTC. NOTE: This code will not set on the hoist.
POSSIBLE CAUSES
TPS DTC P0122 PRESENT IN THE TCM
TPS DTC’S PRESENT IN THE PCM
TCM DTC’S P1744 AND/OR P1745 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
37
TRANSMISSION
TEST
ACTION
APPLICABILITY
2
When monitored: Continually while the vehicle is at high vehicle speeds and higher
engine load conditions.
When set: The gear ratio is incorrect for the current gear requested. The vehicle must
be driven on the road to set the DTC. This DTC will not set on the hoist.
This is the When monitored / When set conditions for DTC P0751.
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 the vehicle shift normally through all forward gears (1st-4th) 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 TCM DTC’s.
Is the P0122 TCM TPS 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 PCM DTC’s.
Are there any PCM TPS DTC’s 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 the DTC P1744 and/or P1745 present?
All
Yes
→
If P1744 or P1745 are present refer to the transmission category
and perform the appropriate symptom. If both DTC’s are present
perform test P1745 first. If the problem is still present, perform
the diagnostic test P1744.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
38
TRANSMISSION
P0751-SOLENOID A FUNCTION 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 A.
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.
39
TRANSMISSION
P0751-SOLENOID A FUNCTION FAULT —
Continued
Symptom:
P0756-SOLENOID B FUNCTIONAL FAULT
When Monitored and Set Condition:
P0756-SOLENOID B FUNCTIONAL FAULT
When Monitored:
Continually while the vehicle is at high vehicle speeds and higher
engine load conditions.
Set Condition:
The gear ratio is incorrect for the current gear requested. The vehicle
must be driven on the road to set the DTC. NOTE: This code will not set on the hoist.
POSSIBLE CAUSES
TPS DTC P0122 PRESENT IN THE TCM
TPS DTC’S PRESENT IN THE PCM
TCM DTC’S P1746 AND/OR P1747 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
40
TRANSMISSION
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