Dodge Dakota (R1). Manual — part 123
Symptom:
*NO RESPONSE FROM ECM AND PCM (DIESEL ONLY)
POSSIBLE CAUSES
CHECK ECM/PCM POWERS AND GROUNDS
POWERTRAIN CONTROL MODULE - SCI TRANSMIT
SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
SCI CIRCUITS SHORTED TOGETHER
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI TRANSMIT CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Perform the symptom Checking ECM and PCM Power and Ground Circuits in the
Driveability category.
Did the vehicle pass this test?
All
Yes
→
No
→
Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
2
Turn the ignition off.
NOTE: Reconnect all previously disconnected components.
Disconnect the PCM harness connectors.
Turn the ignition on.
With the DRB, attempt to communicate with the ECM.
Was the DRB able to communicate with the ECM?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Transmit circuit at the DLC connector.
Is the voltage above 1.0 volt?
All
Yes
→
Repair the SCI Transmit circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
27
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance between the SCI Transmit circuit and the SCI Receive circuit
at the PCM connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the short between the SCI Transmit and the SCI Receive
circuits.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
5
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the SCI Transmit circuit at the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the SCI Transmit circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
6
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Measure the resistance of the SCI Transmit circuit between the PCM C3 connector
and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Transmit circuit for an open between the splice
and the DLC.
Perform ROAD TEST VERIFICATION - VER-2.
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Engine Control Module in accordance with the Ser-
vice Information.
Perform ROAD TEST VERIFICATION - VER-2.
28
COMMUNICATION
*NO RESPONSE FROM ECM AND PCM (DIESEL ONLY) —
Continued
Symptom:
*NO RESPONSE FROM PCM (SCI ONLY) - DIESEL ONLY
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE ECM
CHECK PCM POWERS AND GROUNDS
SCI RECEIVE CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB attempt to communicate with the ECM.
Was the DRB able to communicate with the ECM?
All
Yes
→
No
→
Refer to symptom list for problems related to No Response From
ECM and PCM.
Perform ROAD TEST VERIFICATION - VER-2.
2
Perform the symptom Checking ECM and PCM Power and Ground Circuits in the
Driveability category.
Did the vehicle pass this test?
All
Yes
→
No
→
Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Receive circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the SCI Receive circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
4
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Measure the resistance of the SCI Receive circuit between the PCM C3 connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Receive circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
29
COMMUNICATION
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Measure the resistance of the SCI Transmit circuit between the PCM C3 connector
and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Transmit circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
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 ROAD TEST VERIFICATION - VER-2.
30
COMMUNICATION
*NO RESPONSE FROM PCM (SCI ONLY) - DIESEL ONLY —
Continued
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