Dodge Dakota (R1). Manual — part 37
Symptom:
*NO RESPONSE FROM PCM (SCI ONLY)
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
GROUND CIRCUITS AT DLC OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
Did the vehicle pass this test?
All
Yes
→
No
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
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 circuit.
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 Transmission Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
145
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRBIII
t 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 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 POWERTRAIN VERIFICATION TEST VER - 1.
No
→
5
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Receive circuit at the DLC connector.
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
→
6
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the PCM 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 POWERTRAIN VERIFICATION TEST VER - 1.
No
→
7
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t 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 POWERTRAIN VERIFICATION TEST VER - 1.
No
→
8
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t from the DLC.
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 POWERTRAIN VERIFICATION TEST VER - 1.
146
COMMUNICATION
*NO RESPONSE FROM PCM (SCI ONLY) —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t from the DLC.
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 POWERTRAIN VERIFICATION TEST VER - 1.
10
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the negative battery cable.
Measure the resistance between ground and both ground circuits at the DLC.
Is the resistance below 5.0 ohms for each measurement?
All
Yes
→
No
→
Repair the ground circuit that measured above 5.0 ohms for an
open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
11
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.
147
COMMUNICATION
*NO RESPONSE FROM PCM (SCI 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.
148
COMMUNICATION
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