No Response From DTCM (Drivetrain Control Module)

NO RESPONSE FROM DTCM (DRIVETRAIN CONTROL MODULE)





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 battery voltage is between 10.0 and 16.0 volts.

2. With the scan tool, read the module status.

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

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

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.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

2. CHECK THE (A913) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT CIRCUIT




1. Turn the ignition off.
2. Disconnect the DTCM harness connector.
3. Using a 12-volt test light connected to ground, check the (A913) Fused B(+) circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the open or short in the (A913) Fused B(+) circuit.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

3. CHECK THE (Z901) GROUND CIRCUIT FOR AN OPEN




1. Using a 12-volt test light connected to 12-volts, check the (Z901) Ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open in the (Z901) Ground circuit.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

4. CHECK THE (F946) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT




1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F946) Fused Ignition Switch Output (Run-Start) circuit.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the open or short in the (F946) Fused Ignition Switch Output (Run-Start) circuit.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

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




1. Turn the ignition off.
2. Disconnect the Front CAN C Star Connector C12 harness connector.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the Front CAN C Star Connector C12 harness connector and the DTCM harness connector.
4. Measure the resistance of the (D64) CAN C Bus (-) circuit between the Front CAN C Star Connector C12 harness connector and the DTCM harness connector.

Are the resistances below 5.0 Ohms?

Yes

- Replace the Drivetrain Control Module (DTCM). Drivetrain Control Module - Removal.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.

No

- Repair the open in the (D65) CAN C Bus (+) or (D64) CAN C Bus (-) circuit.
- Perform the DTCM VERIFICATION TEST. DTCM Verification Test.