Jeep Wrangler TJ. Manual — part 150
TEST
ACTION
APPLICABILITY
7
Turn the ignition off to the lock position.
Disconnect the Input Speed Sensor harness connector.
Disconnect the TCM harness connector.
Remove the Transmission Control Relay from the PDC.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control
Relay Output circuit in the Transmission Control Relay connector.
Ignition on, engine not running.
Measure the voltage of the Input Speed Sensor Signal circuit in the TCM harness
connector.
Is the voltage above 0.5 volts?
All
Yes
→ Repair the Input Speed Sensor Signal circuit for a short to
voltage.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 8
8
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Input Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Speed Sensor Ground circuit from the TCM harness
connector to the Input Speed Sensor harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Speed Sensor Ground circuit for an open.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 9
9
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the TRS harness connector.
Remove the Transmission Control Relay from the PDC.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control
Relay Output circuit in the Transmission Control Relay connector in the PDC.
Ignition on, engine not running.
Measure the voltage of the Speed Sensor Ground circuit in the TCM harness
connector.
Is the voltage above 0.5 volts?
All
Yes
→ Repair the Speed Sensor Ground circuit for a short to voltage.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 10
10
Using the schematics as a guide, inspect the wiring and connectors. Repair as
necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module per the Service Infor-
mation. WITH THE DRBIII
t PERFORM QUICK LEARN.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
325
TRANSMISSION - 42RLE
P0715-INPUT SPEED SENSOR ERROR —
Continued
TEST
ACTION
APPLICABILITY
11
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.
With the DRBIII
t, check the EATX EVENT DATA to help identify the conditions in
which the DTC was set.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Test Complete.
326
TRANSMISSION - 42RLE
P0715-INPUT SPEED SENSOR ERROR —
Continued
Symptom:
P0720-OUTPUT SPEED SENSOR ERROR
When Monitored and Set Condition:
P0720-OUTPUT SPEED SENSOR ERROR
When Monitored:
The transmission gear ratio is monitored continuously while the
transmission is in gear.
Set Condition:
If there is an excessive change in output RPM in any gear.
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
SPEED SENSOR GROUND CIRCUIT OPEN
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE
OUTPUT SPEED SENSOR ERROR
TRANSMISSION CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
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.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII
t, read the engine DTC’s. Check and repair all engine DTC’s prior
to performing Transmission Symptom Diagnostics.
With the DRBIII
t, 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 P0706 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
327
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
2
Start the engine in park.
Raise the drive wheels off of the ground.
WARNING: PROPERLY SUPPORT THE VEHICLE.
Place transmission in drive, release foot from brake.
WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING
WHEELS.
Note: The drive wheels must be turning at this point.
With the DRBIII
t, read the Output RPM
Is the Output RPM below 100 RPM?
All
Yes
→ Go To 3
No
→ Go To 11
3
Turn the ignition off to the lock position.
CAUTION: Remove the Starter Relay from the PDC. This will prevent the
vehicle from being started in gear.
Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmis-
sion Adapter kit 8333-1A.
Ignition on, engine not running.
With the Transmission Simulator, set the
9Input/Output Speed9 switch to 9ON9 and
the rotary switch to the
93000/12509 position.
With the DRBIII
t, read the Input RPM and Output RPM.
Does the Input RPM read 3000 and the Output RPM read 1250 ± 50 RPM?
All
Yes
→ Go To 4
No
→ Go To 5
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the Output Speed Sensor per the Service Information.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
5
Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Output Speed Sensor harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Output Speed Sensor Signal circuit from the TCM
harness connector to the Output Speed Sensor harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Output Speed Sensor Signal circuit for an open.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 6
328
TRANSMISSION - 42RLE
P0720-OUTPUT SPEED SENSOR ERROR —
Continued
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