No Response From TCM - NAG1/Diesel

*NO RESPONSE FROM TCM - NAG1/DIESEL

For a complete wiring diagram refer to Diagrams/Electrical.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.

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

With 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 and any ignition related DTCs, perform DTCs before proceeding.

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

Yes

- Go To 2

No

- The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.

2. (Z910) GROUND CIRCUIT OPEN





Turn the ignition off.

Disconnect the TCM C1 harness connector.

Using a 12-volt test light connected to 12-volts, check the (Z910) ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the (Z910) ground circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

3. (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT OPEN OR SHORTED





Turn the ignition on.

Using a 12-volt test light connected to ground, check the (T16) Transmission Control Output circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (T16) Transmission Control Output circuit for an open or short.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (D65) CAN C BUS (+) CIRCUIT OPEN





Turn the ignition off.

Disconnect the TIPM C1 harness connector.

Disconnect the TCM C2 harness connector.

Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM connector and the TCM connector.

Is resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the (D65) CAN C Bus (+) circuit for an open.
- Perform NAG1/Diesel TRANSMISSION VERIFICATION TEST - VER 1. NAG1 Transmission Verification Test

5. (D64) CAN C BUS (-) CIRCUIT OPEN





Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM connector and the TCM connector.

Is resistance below 5.0 ohms?

Yes

- Replace the Transmission Control Module.
- Perform NAG1/Diesel TRANSMISSION VERIFICATION TEST - VER 1. NAG1 Transmission Verification Test

No

- Repair the (D64) CAN C Bus (-) circuit for an open.
- Perform NAG1/Diesel TRANSMISSION VERIFICATION TEST - VER 1. NAG1 Transmission Verification Test