NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE)

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

Possible Causes
(Z916) GROUND CIRCUIT OPEN
(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT OPEN OR SHORTED
(D65) CAN C BUS (+) CIRCUIT OPEN
(D64) CAN C BUS (-) CIRCUIT OPEN
TRANSMISSION CONTROL MODULE (TCM)

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.

Go To 2

2. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT 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 (T16) Transmission Control Output circuit.

Does the test light illuminate brightly?

Yes

Go To 3

Repair the open or short in the (T16) Transmission Control Output circuit.
Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).

3. CHECK THE (Z916) GROUND CIRCUIT FOR AN OPEN

1.	Turn the ignition off.

2.	Using a 12-volt test light connected to 12-volts, check the (Z916) Ground circuit.

Does the test light illuminate brightly?

Yes

Go To 4

Repair the open in the (Z916) Ground circuit.
Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).

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 in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Transmission Control - Description) .
Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).

Repair the open in the (D64) or (D65) CAN C Bus circuit.
Perform the NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).

NO RESPONSE FROM TCM (TRANSMISSION CONTROL MODULE)

Possible Causes