Jeep Wrangler TJ. Manual — part 28
Symptom:
*NO RESPONSE FROM PCM (PCI BUS) - NGC
POSSIBLE CAUSES
PCM PCI NO RESPONSE
POWERTRAIN CONTROL MODULE
PCI BUS CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, enter Body then Electro/Mechanical Cluster (MIC).
With the DRB, enter Passive Restraints then Airbag.
Were you able to establish communications with any of the modules?
All
Yes
→ Go To 2
No
→ Refer to symptom PCI Bus Communication Failure in the Com-
munications category.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
With the DRB read the Powertrain DTC’s. This is to ensure power and grounds to the
PCM are operational.
NOTE: If the DRB will not read PCM DTC’s, follow the NO RESPONSE TO
PCM (PCM SCI only) symptom path.
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.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII
t select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the appropriate terminal of special tool #8815.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Repair the PCI Bus circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
109
COMMUNICATION
Symptom:
*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC
POSSIBLE CAUSES
CHECK PCM POWERS AND GROUNDS
CONTROLLER ANTILOCK BRAKE
SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE
SCI CIRCUITS SHORTED TOGETHER
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
NOTE: With the DRBIII
t in the generic scan tool mode, attempt to commu-
nicate with the PCM.
NOTE: If the DRBIII
t can communicate with the PCM in the generic scan
tool mode, it may not be necessary to perform this step.
Did the vehicle pass this test?
All
Yes
→ Go To 2
No
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit circuit at the DLC (cav
7).
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Go To 4
110
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the CAB harness connector (if equipped).
NOTE: If vehicle is not equipped with antilock brakes, answer yes to the
question.
Measure the resistance between ground and the SCI Transmit circuit at the DLC (cav
7).
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the SCI Transmit circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Replace the Controller Antilock Brake in accordance with the
service information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
4
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the CAB harness connector (if equipped).
Turn the ignition on.
Measure the voltage of the SCI Transmit circuit at the DLC (cav 7).
Is the voltage above 1.0 volt?
All
Yes
→ Repair the SCI Transmit circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Receive circuit at the DLC (cav 12).
Is the voltage above 1.0 volt?
All
Yes
→ Repair the SCI Receive circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Measure the resistance between the SCI Transmit circuit and the SCI Receive circuit
at the DLC (cavs 7 and 12).
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short between the SCI Transmit and the SCI Receive
circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 7
111
COMMUNICATION
*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Receive circuit at the DLC (cav
12).
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the SCI Receive circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the DRB from the DLC.
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.
Measure the resistance of the SCI Receive circuit from the DLC (cav 12) to the
appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the SCI Receive circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
9
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the DRB from the DLC.
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.
Measure the resistance of the SCI Transmit circuit from the DLC (cav 7) to the
appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the SCI Transmit circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
10
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
112
COMMUNICATION
*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC —
Continued
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