Jeep Wrangler TJ. Manual — part 135
Symptom:
U0101-NO BUS MESSAGE FROM TRANS CONTROL MODULE
When Monitored and Set Condition:
U0101-NO BUS MESSAGE FROM TRANS CONTROL MODULE
When Monitored:
Equipped with automatic transmission. The ignition on. Battery
voltage greater than 10 volts.
Set Condition:
An open circuit on the (F11) Fused Igniton Switch Output circuit. No bus
messages from the TCM for 20 seconds, two trips required.
POSSIBLE CAUSES
DTC RESET
PCM FUSED IGNITION SWITCH OUTPUT CIRCUIT
PCI BUS UNABLE TO COMMUNICATE WITH DRBIII
t
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, erase DTCs.
Cycle the ignition key on and off several times. Leaving the ignition on for at least 20
seconds.
With the DRBIII
t, read DTCs.
Does the DTC reset?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Turn the ignition off.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
With a 12-volt test light connected to ground and with special tool #8815 installed,
probe the (F11) Fused Ignition Switch Output circuit.
Perform the above check with the Ignition key in the off lock position, Ignition on,
engine not running position, and during cranking.
Wiggle the related wire harness while probing the special tool with the test light to
try to interrupt the circuit.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Repair the open or excessive resistance in the (F11) Fused
Ignition Switch (Offf, Run, Start) circuit. Inspect the related fuse,
if the fuse is open check the circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
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DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
3
NOTE: Determine which modules this vehicle is equipped with before
beginning.
NOTE: When attempting to communicate with any of the modules on this
vehicle, the DRBIII
t will display 1 of 2 different communication errors: a
NO RESPONSE message or a BUS +/- SIGNALS OPEN MESSAGE.
Ignition on, engine not running.
Use the DRBIII
t, attempt to communicate with the remaining control modules.
Was the DRBIII
t able to communicate with one or more of the Modules?
All
Yes
→ Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Refer to the COMMUNICATION category and perform the PCI
BUS COMMUNICATION FAILURE Symptom.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
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DRIVEABILITY - NGC
U0101-NO BUS MESSAGE FROM TRANS CONTROL MODULE —
Continued
Symptom:
U0155-NO CLUSTER BUS MESSAGE
When Monitored and Set Condition:
U0155-NO CLUSTER BUS MESSAGE
When Monitored:
Ignition key on and engine running.
Set Condition:
No messages received from the MIC (Instrument Cluster) for 20 seconds.
POSSIBLE CAUSES
DTC RESET
COMMUNICATE WITH CLUSTER
INSTRUMENT CLUSTER OPERATION
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, erase DTCs.
Start the engine and shut if off several times allowing it to idle each time for 20
seconds.
With the DRBIII
t, read DTCs.
Does the DTC reset?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Ignition on, engine not running.
With the DRBIII
t, attempt to communicate with the Instrument cluster.
Can communication be established with the Instrument Cluster?
All
Yes
→ Go To 3
No
→ Refer to the Communication Category and perform the appropri-
ate symptom related to no communication with cluster.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3
Start the engine
Allow the engine to idle.
Is the correct engine speed display in the instrument cluster (Tach)?
All
Yes
→ Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Refer to the Instrument Category and perform the appropriate
symptom.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
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DRIVEABILITY - NGC
Symptom:
U0168-NO SKIM BUS MESSAGE
When Monitored and Set Condition:
U0168-NO SKIM BUS MESSAGE
When Monitored:
Ignition on or engine running.
Set Condition:
No J1850 messages received from the Smart Key Immobilizer Module
(SKIM) for 20 seconds. One Trip Fault. Three good trips to turn off the MIL.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
NO RESPONSE FROM SKIM
PCI BUS CIRCUIT OPEN FROM PCM TO SKIM
SKIM/PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read the DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform SKIS VERIFICATION.
2
With the DRBIII
t, attempt to communicate with the SKIM.
NOTE: This test will indicate if the bus is operational from the DLC to the
SKIM.
Was the DRBIII
t able to communicate with the SKIM?
All
Yes
→ Go To 3
No
→ Refer to Symptom BUS +/- SIGNAL OPEN FROM SKIM in the
COMMUNICATION category.
Perform SKIS VERIFICATION.
268
DRIVEABILITY - NGC
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