Jeep Wrangler TJ. Manual — part 151
TEST
ACTION
APPLICABILITY
6
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 between ground and the Output Speed Sensor Signal circuit.
Is the resistance Below 5.0 ohms?
All
Yes
→ Repair the Output Speed Sensor Signal circuit for a short to
ground.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 7
7
Turn ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Simulator.
Remove the Transmission Control Relay from the PDC.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B(+) and Transmission Control Relay
Output circuits in the Transmission Control Relay connector (In PDC).
Ignition on, engine not running.
Measure the voltage of the Output Speed Sensor Signal circuit in the TCM connector.
Is the voltage above 3.0 volts?
All
Yes
→ Repair Output Speed Sensor Signal circuit 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 Output 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 Output 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 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(+) and Transmission Control Relay
Output circuits in the Transmission Control Relay connector (In PDC).
Ignition on, engine not running.
Measure the voltage of the Speed Sensor Ground circuit in the TCM connector.
Is the voltage above 3.0 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
329
TRANSMISSION - 42RLE
P0720-OUTPUT SPEED SENSOR ERROR —
Continued
TEST
ACTION
APPLICABILITY
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.
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.
330
TRANSMISSION - 42RLE
P0720-OUTPUT SPEED SENSOR ERROR —
Continued
Symptom:
P0725-ENGINE SPEED SENSOR CIRCUIT
When Monitored and Set Condition:
P0725-ENGINE SPEED SENSOR CIRCUIT
When Monitored:
Whenever the engine is running.
Set Condition:
Engine RPM less than 390 or greater than 8000 for more than 2 seconds
while the engine is running.
POSSIBLE CAUSES
INTERMITTENT WIRING & CONNECTORS CONDITIONS
EATX RPM SIGNAL CIRCUIT OPEN
EATX RPM SIGNAL CIRCUIT SHORTED TO GROUND
EATX RPM SIGNAL CIRCUIT SHORTED TO VOLTAGE
TRANSMISSION CONTROL MODULE
POWERTRAIN 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
331
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
2
NOTE: This code is not a Transmission Input Speed Sensor DTC
With the DRBIII
t, Check the STARTS SINCE SET counter.
NOTE: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter set at 0?
All
Yes
→ Go To 3
No
→ Go To 8
3
Turn ignition off to the lock position.
Disconnect the Powertrain Control Module (PCM) harness connector.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the EATX RPM signal circuit between the TCM connector
and the PCM connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the open EATX RPM Signal circuit.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 4
4
Turn ignition off to the lock position.
Disconnect the Powertrain Control Module (PCM) harness connector.
Disconnect the TCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the EATX RPM Signal circuit and ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the EATX RPM Signal circuit for a short to ground.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 5
5
Turn ignition off to the lock position.
Disconnect the PCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Measure the voltage of the EATX RPM Signal circuit in the PCM connector.
Is the voltage above 10.0 volts?
All
Yes
→ Repair the EATX RPM Signal circuit for a short to voltage.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 6
6
Turn the ignition off to the lock position.
Disconnect the PCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Measure the voltage of the EATX RPM Signal circuit.
Is the voltage between 4.5 and 5.5 volts?
All
Yes
→ Replace and program the Powertrain Control Module per the
Service Information.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER
1.
No
→ Go To 7
332
TRANSMISSION - 42RLE
P0725-ENGINE SPEED SENSOR CIRCUIT —
Continued
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