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
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the TCM harness connector (if equipped).
Turn the ignition on.
Measure the voltage of the SCI Transmit (PCM) circuit at the DLC connector.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the SCI Transmit (PCM) 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 (PCM) circuit at the DLC connector.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the SCI Receive (PCM) 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 (PCM) circuit and the SCI Receive
(PCM) circuit at the PCM connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short between the SCI Transmit (PCM) and the SCI
Receive (PCM) circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the PCM C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Receive (PCM) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the SCI Receive (PCM) circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the PCM C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Receive (PCM) circuit between the PCM C2
connector and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the SCI Receive (PCM) circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
397
COMMUNICATION
*NO RESPONSE FROM PCM (SCI ONLY) - SBEC —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off.
Disconnect the PCM C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Transmit (PCM) circuit between the PCM C2
connector and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the SCI Transmit (PCM) 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.
398
COMMUNICATION
*NO RESPONSE FROM PCM (SCI ONLY) - SBEC —
Continued
Symptom:
*NO RESPONSE FROM POWER LIFTGATE MODULE
POSSIBLE CAUSES
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
BODY CONTROL MODULE - LIFTGATE WAKE UP GROUND OPEN
LIFTGATE MODULE WAKE UP SIGNAL WIRE OPEN
LIFTGATE MODULE WAKE UP SIGNAL WIRE SHORT TO VOLTAGE
LIFTGATE MODULE WAKE UP SIGNAL WIRE SHORT TO GROUND
PCI BUS CIRCUIT OPEN
POWER LIFTGATE MODULE - OPEN
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Power Liftgate Module C1 harness connector.
Measure the voltage of the Fused B(+) circuit.
Is the voltage above 10.0 volts?
All
Yes
→ Go To 2
No
→ Repair the Fused B(+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Power Liftgate Module C1 harness connector.
Using a 12-volt test light connected to 12-volts, check the Ground circuit.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
399
COMMUNICATION
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