EPS System

Control System DTCs

EPS DTC Troubleshooting: 23-04

DTC 23-04 : CAN Bus-Off Malfunction

NOTE:
* Before you troubleshoot, record all freeze data and any on-board snapshot, and review the how to troubleshoot the EPS Initial Inspection and Diagnostic Overview.
* If the MIL indicator is on, troubleshoot the fuel and emissions systems first.






1. Problem verification:

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

-2. Clear the DTC with the HDS.

-3. Turn the ignition switch to LOCK (0), then start the engine.

-4. Check for DTCs with the HDS.






Is DTC 23-04 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time.

2. Open wire check (F CAN-H, F CAN-L lines):

-1. Turn the ignition switch to LOCK (0).

-2. Short the SCS line with the HDS.

-3. Disconnect the following connectors.






-4. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- The F CAN-H, F CAN-L wires are OK. Go to step 3.
-NO- Repair an open in the wire between the EPS control unit and the PCM.

3. EPS control unit check (update):

-1. Reconnect the following connectors.






-2. Update the EPS control unit Programming and Relearning if it does not have the latest software.

-3. Turn the ignition switch to LOCK (0), then start the engine.

-4. Check for DTCs with the HDS.






Is DTC 23-04 indicated?
-YES- Replace the EPS control unit Service and Repair.
-NO- Troubleshooting is complete.