No Response From TCM (Transmission Control Module)

NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE) - 6.7L





For a complete wiring diagram, refer to the Wiring Information.






1. TEST FOR INTERMITTENT CONDITION

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

1. Turn the ignition on.

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

2. Using the scan tool, select ECU View.

NOTE: A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

NOTE: Check the TIPM for any active CAN C hardware DTCs, perform DTC before proceeding.

Does the scan tool display a red "X" next to the module?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

2. (A209) FUSED B(+) CIRCUIT OPEN OR SHORTED




1. Turn the ignition off.
2. Disconnect the TCM C2 harness connector.
3. Using a 12-volt test light connected to ground, check the (A209) Fused B(+) circuit.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 3

No

- Repair the open or short to ground in the (A209) Fused B(+) circuit.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

3. (Z906) GROUND CIRCUITS OPEN




1. Using a 12-volt test light connected to 12-volts, check the (Z906) Ground circuits.

Does the test light illuminate brightly for each circuit?

Yes

- Go To 4

No

- Repair the open in the (Z906) Ground circuit.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

4. (D52) CAN C BUS (+) CIRCUIT OPEN




1. Disconnect the TIPM C7 harness connector.
2. Measure the resistance of the (D52) CAN C Bus (+) circuit between the TIPM C7 harness connector and the TCM C2 harness connector.

Is resistance below 5.0 Ohms?

Yes

- Go To 5

No

- Repair the open in the (D52) CAN C Bus (+) circuit.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

5. (D51) CAN C BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D51) CAN C Bus (-) circuit between the TIPM C7 harness connector and the TCM C2 harness connector.

Is resistance below 5.0 Ohms?

Yes

- Replace the TCM.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Repair the open in the (D51) CAN C Bus (-) circuit.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.