41-4

SH AWD DTC Troubleshooting: 41-4

DTC 41-4:

F-CAN Malfunction (Lost Communication with A/T Control Unit)

NOTE: Before you troubleshoot, review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine.

4. Check for DTCs in the PGM-FI system with the HDS.

Are there any PGM-FI DTCs indicated?

YES -

Go to the indicated DTC's troubleshooting.�

NO -

Go to step 5.

5. Check for DTCs with the HDS.

Is DTC 41-4 indicated?

YES -

Go to step 6.

NO -

Intermittent failure, the system is OK at this time. Check for intermittent open between SH-AWD control unit connector terminals A10 and A20 and PCM connector terminals A36 and A37.�

6. Turn the ignition switch to LOCK (0).

7. Jump the SCS line with the HDS.

NOTE: This step must be done to prevent PCM damage.

8. Disconnect PCM connector A (44P).

9. Disconnect SH-AWD control unit connector A (20P).

10. Check for continuity between PCM connector terminals A36, A37 and SH-AWD control unit connector terminals A10, A20 respectively.





Is there continuity?

YES -

Go to step 11.

NO -

Repair an open in the wires between the SH-AWD control unit and the PCM.�

11. Check for DTCs in the gauge control module with the HDS.

Are there any F-CAN communication failure DTCs between the gauge control module and PGM-FI system indicated?

YES -

Update the PCM if it does not have latest software PCM Update. If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview and recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM Service and Repair.�

NO -

Update the SH-AWD control unit if it does not have the latest software SH-AWD Control Unit Update, or substitute a known-good SH-AWD control unit Service and Repair and recheck. If the symptom/indication goes away with the updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good SH-AWD control unit, replace the original SH-AWD control unit Service and Repair.�