Diagnostic Test

1) CHECK TO SEE IF TCM DTCS ARE PRESENT

Fig 1: Connecting Scan Tool & Turning Ignition On
Courtesy of DAIMLERCHRYSLER CORP.

Turn ignition on.

With the DRB III®, read TCM DTCs.

Are any performance or Bus related DTCs present?

Yes
1. Repair all TCM DTCs before proceeding.
2. Perform BODY VERIFICATION TEST .
No

Go To step 2).
2) VERIFY DTCS

Fig 2: Connecting Scan Tool & Turning Ignition On
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition on.

With the DRB III®, erase DTCs.

Turn the ignition off, then back on.

Monitor the DRB III® for this DTC.

Did this DTC set again?

Yes
1. Go To step 3).
No
1. Go To step 12).
3) PCM AND SKREEM CAN C BUS TERMINATION

Fig 3: Checking PCM CAN C BUS Termination
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance of the PCM CAN C Bus termination by back probing the CAN C Bus (+) circuit to the CAN C Bus (-) circuit at the PCM C4 harness connector.

Is the resistance between 50 and 70 ohms?

Yes
1. Go To step 11).
No
1. Go To step 4).
4) PCM CAN C BUS TERMINATION

Fig 4: Checking SKREEM CAN C BUS Termination
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Disconnect the PCM C4 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the SKREEM CAN C Bus termination by back probing the CAN C Bus (+) circuit to the CAN C Bus (-) circuit at the PCM C4 harness connector.

Is the SKREEM CAN C Bus termination resistance between 110 and 130 ohms?

Yes
1. Replace and program the Powertrain Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL) .
2. Perform BODY VERIFICATION TEST .
No
1. Go To step 5).
5) SKREEM TERMINATION

Fig 5: Checking SKREEM CAN C BUS Termination
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance of the SKREEM CAN C Bus termination by back probing the CAN C Bus (+) circuit to the CAN C Bus (-) circuit at the SKREEM C2 harness connector.

Is the resistance between 110 and 130 ohms?

Yes
1. Go To step 6).
No
1. Replace the SKREEM. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/ENTRY MODULE - REMOVAL) .
2. Perform BODY VERIFICATION TEST .
6) CAN C BUS (-) CIRCUIT OPEN

Fig 6: Checking CAN C BUS (-) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance of the CAN C Bus (-) circuit from the SKREEM C2 harness connector to the PCM C4 harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 7).
No
1. Repair the CAN C Bus (-) circuit for an open.
2. Perform BODY VERIFICATION TEST .
7) CAN C BUS (+) CIRCUIT OPEN

Fig 7: Checking CAN C BUS (+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance of the CAN C Bus (+) circuit from the PCM C4 harness connector to the SKREEM C2 harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 8).
No
1. Repair the CAN C Bus (+) circuit for an open.
2. Perform BODY VERIFICATION TEST .
8) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE

Fig 8: Checking CAN C BUS (+) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on.

Measure the voltage of the CAN C Bus (+) circuit at the PCM C4 harness connector.

Is the voltage above 1.0 volt?

Yes
1. Repair the CAN C Bus (+) circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST .
No
1. Go To step 9).
9) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE

Fig 9: Checking CAN C BUS (-) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition on.

Measure the voltage of the CAN C Bus (-) circuit at the PCM C4 harness connector.

Is the voltage above 1.0 volt?

Yes
1. Repair the CAN C Bus (-) circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST .
No
1. Go To step 10).
10) CAN C BUS (-) CIRCUIT SHORT TO GROUND

Fig 10: Checking CAN C BUS (-) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance between ground and the CAN C Bus (-) circuit.

Is the resistance below 100 ohms?

Yes
1. Repair the CAN C Bus (-) circuit for a short to ground.
2. Perform BODY VERIFICATION TEST .
No
1. Repair the CAN C Bus (+) circuit for a short to ground.
2. Perform BODY VERIFICATION TEST .
11) CAN C BUS (-) CIRCUIT OPEN FROM TCM TO INSTRUMENT CLUSTER

Fig 11: Checking CAN C BUS (-) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Disconnect the TCM C3 harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the CAN C Bus (-) circuit from the TCM C3 harness connector to the Instrument Cluster C1 harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Repair the CAN C Bus (+) circuit for an open between the Instrument Cluster C1 harness and the TCM C3 harness connector.
2. Perform BODY VERIFICATION TEST .
No
1. Repair the CAN C Bus (-) circuit for an open between the Instrument Cluster C1 harness and the TCM C3 harness connector.
2. Perform BODY VERIFICATION TEST .
12) INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.

NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs.

NOTE: Check for any Technical Service Bulletins that may apply.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and/or open circuits.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST - VER 1 .
No
1. The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition.