Jeep XJ. Manual — part 887
TEST
ACTION
APPLICABILITY
7
Turn ignition off to the lock position.
Disconnect the TCM harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Connect the ground clip of a test light to a known good ground.
Connect the other end to the Fused B(+) circuit in the TCM connector.
NOTE: The light must illuminate brightly, if it does not light, or lights dimly,
the circuit must be repaired. If there is any doubt, compare the brightness
when testing the circuit, to the brightness when connected directly to the
battery.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the open or high resistance Fused B(+) circuit.
Perform AW4 TRANS VERIFICATION TEST-VER1.
8
If there are no possible causes remaining, view repair.
All
Repair
Replace the TCM.
Perform AW4 TRANS VERIFICATION TEST-VER1.
17
TRANSMISSION
P0562-TRANSMISSION VOLTAGE LOW —
Continued
Symptom:
P0563-TRANSMISSION VOLTAGE HIGH
When Monitored and Set Condition:
P0563-TRANSMISSION VOLTAGE HIGH
When Monitored:
Continuously with the key on.
Set Condition:
The voltage on the Fused B(+) circuit goes above 17.5 volts for 1 minute.
POSSIBLE CAUSES
CHARGING SYSTEM DTC’S PRESENT IN THE PCM
INTERMITTENT WIRING AND/OR CONNECTORS
CHARGING SYSTEM NO CODE
TCM-FUSED B+ SUPPLY
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
2
When monitored: Continuously with the ignition key on.
When set: The voltage on the Fused B(+) circuit goes above 17.5 volts for 1 minute.
This is the When monitored / When set conditions for DTC P0563
All
Continue
18
TRANSMISSION
TEST
ACTION
APPLICABILITY
3
With the DRBIII
t, read the PCM DTC’s.
NOTE: Also check for Charging System no DTC’s present symptom’s.
Are there any Charging system DTC’s, stored in the PCM.
All
Yes
→
Refer to the Charging category and perform the appropriate
symptom.
Perform AW4 TRANS VERIFICATION TEST-VER1.
No
→
4
With the DRBIII
t, read the Battery Voltage under Transmission Sensors.
Start the engine.
Increase the Engine Speed to 1500 RPM.
Is the Transmission Voltage below 17.7 volts?
All
Yes
→
No
→
5
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.
6
Start the engine.
Increase the Engine Speed to 1500 RPM.
While backprobing, measure the voltage of the Fused B(+) circuit in the TCM harness
connector.
Is the voltage below 17.7 volts?
All
Yes
→
No
→
Refer to the Charging category and perform the Charging System
No Code.
Perform AW4 TRANS VERIFICATION TEST-VER1.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the TCM.
Perform AW4 TRANS VERIFICATION TEST-VER1.
19
TRANSMISSION
P0563-TRANSMISSION VOLTAGE HIGH —
Continued
Symptom:
P0705-RANGE SENSOR
When Monitored and Set Condition:
P0705-RANGE SENSOR
When Monitored:
Continuously with the key on.
Set Condition:
No Transmission Range Sensor signals are received or two conflicting
signals are received from the Transmission Range Sensor at the same time by the TCM.
POSSIBLE CAUSES
PCM PARK/NEUTRAL DTC’S PRESENT
INTERMITTENT WIRING AND/OR CONNECTORS
FUSED IGNITION SWITCH OUTPUT OPEN OR HIGH RESISTANCE
TRS 1-2 SENSE CIRCUIT OPEN
TRS 3 SENSE CIRCUIT OPEN
TRS OVERDRIVE SENSE CIRCUIT OPEN
TRS REVERSE SENSE CIRCUIT OPEN
TRS 1-2 SENSE CIRCUIT SHORTED TO GROUND
TRS 3 SENSE CIRCUIT SHORTED TO GROUND
TRS OVERDRIVE SENSE CIRCUIT SHORTED TO GROUND
TRS REVERSE SENSE CIRCUIT SHORTED TO GROUND
TRS 1-2 SENSE CIRCUIT SHORTED TO VOLTAGE
TRS 3 SENSE CIRCUIT SHORTED TO VOLTAGE
TRS OVERDRIVE SENSE CIRCUIT SHORTED TO VOLTAGE
TRS REVERSE SENSE CIRCUIT SHORTED TO VOLTAGE
TRANS RANGE SENSOR-SENSE CIRCUIT
TCM-TRS SENSE CIRCUIT INPUTS
20
TRANSMISSION
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