No Response From TCM (Transmission Control Module) - NAG1

NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE) - NAG1





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. With the scan tool, read the module status.

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

Does the scan tool indicate that the module is active on the bus?

Yes

- The no response condition is 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.

No

- Go To 2

2. CHECK THE (F202) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT




1. Turn the ignition off.
2. Disconnect the TCM C1 harness connector.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, check the (F202) Fused Ignition Switch Output (Run-Start) circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the open or short in the (F202) Fused Ignition Switch Output (Run-Start) circuit.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. .

3. CHECK THE (Z909) GROUND CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z909) Ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open in the (Z909) Ground circuit.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. .

4. CHECK THE (D64) AND (D65) CAN C BUS CIRCUITS FOR AN OPEN




1. Disconnect the TIPM C1 harness connector.
2. Disconnect the TCM C2 harness connector.
3. Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM C1 harness connector and the TCM C2 harness connector.
4. Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM C1 harness connector and the TCM C2 harness connector.

Are the resistances below 5.0 Ohms?

Yes

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

No

- Repair the open in the (D64) or (D65) CAN C Bus circuit.
- Perform the NAG1 TRANSMISSION VERIFICATION TEST. .