Chrysler Town, Dodge Caravan. Manual - part 790
Symptom:
*NO RESPONSE FROM PCM (SCI ONLY) - SBEC
POSSIBLE CAUSES
CHECK PCM POWERS AND GROUNDS
SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
TRANSMISSION CONTROL MODULE
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 C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit (PCM) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Go To 4
3
Turn the ignition off.
Disconnect the TCM harness connector (if equipped).
NOTE: If vehicle is not equipped with a TCM, answer yes to the question.
Measure the resistance between ground and the SCI Transmit (PCM) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the SCI Transmit (PCM) circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Replace the Transmission Control Module in accordance with the
service information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
396
COMMUNICATION