No Response From TCM (Transmission Control Module)

*NO RESPONSE FROM TRANSMISSION CONTROL MODULE









Diagnostic Test

1. CHECK COMMUNICATION WITH OTHER MODULES





Turn the ignition on.

Using the DRB III(R), attempt to communicate with any other module.

Is the DRB III(R) able to communicate with the module selected?

Yes

- Go to 2

No

- Perform Symptom *No Response From All Modules. No Response From All Modules

2. TRACTION SYSTEM RELAY OUTPUT CIRCUIT OPEN





Turn the ignition off.

Disconnect the TCM harness connector.

NOTE: Check connector - Clean/repair as necessary.

Turn the ignition on.

Measure the voltage of the Traction System Relay Output circuit at the TCM harness connector.

Is the voltage above 10 volts?

Yes

- Go to 3

No

- Repair the Traction System Relay Output circuit for an open.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

3. GROUND CIRCUIT OPEN





Turn the ignition off.

Measure the resistance of the Ground circuit from the TCM harness connector to ground.

Is the resistance below 5.0 ohms?

Yes

- Go to 4

No

- Repair the Ground circuit for an open.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

4. SCI TRANSMIT CIRCUIT OPEN





With the ignition off.

Measure the resistance of the SCI Transmit circuit from the TCM harness connector to the DLC.

Is the resistance below 5.0 ohms?

Yes

- Go to 5

No

- Repair the SCI Transmit circuit for an open.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

5. SCI TRANSMIT CIRCUIT SHORTED TO GROUND





With the ignition off.

Measure the resistance between ground and the SCI Transmit circuit.

Is the resistance above 100 kohms?

Yes

- Go to 6

No

- Repair the SCI Transmit circuit for a short to ground.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

6. SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE





Turn the ignition on.

Measure the voltage of the SCI Transmit circuit at the DLC.

Is the voltage below 0.5 volt?

Yes

- Replace the Transmission Control Module.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test

No

- Repair the SCI Transmit circuit for a short to voltage.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. Transmission Verification Test