No Response From Pcm (Pcm Sci Only) - Ngc - Jeep Wrangler TJ 2006 Diagnostic Manual

Symptom:

*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC

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
1 Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
NOTE: With the DRBIII in the generic scan tool mode, attempt to commu-
nicate with the PCM.
NOTE: If the DRBIII 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?
Yes → Go To 2
→ Repair as necessary.
No
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?
Yes → Go To 3
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 1.
113
COMMUNICATION
APPLICABILITY
All
All