DTC 23-04: CAN Bus-Off Malfunction

NOTE:

Before you troubleshoot, review the general troubleshooting information .
Troubleshoot any PGM-FI DTCs first - Refer to: How to Troubleshoot the Fuel and Emissions Systems How to Troubleshoot the CVT System(CVT System) .

DTC Description	DTC	Freeze Frame
23-04 CAN Bus-Off Malfunction

1. Problem verification:

1. Turn the vehicle to the ON mode.

2. Clear the DTC with the HDS.

3. Turn the vehicle to the OFF (LOCK) mode, then start the engine.

4. Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame
23-04 CAN Bus-Off Malfunction

Is DTC 23-04 indicated?

YES

The failure is duplicated. Go to step 2.

Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. Open wire check (F-CAN_H, F-CAN_L lines):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Jump the SCS line with the HDS, and wait more than 1 minute.

3. Disconnect the following connectors.

EPS control unit connector A (11P)

PCM connector A (51P)

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

Test condition	Vehicle OFF (LOCK) mode
	EPS control unit connector A (11P): disconnected
	PCM connector A (51P): disconnected

Test point 1	EPS control unit connector A (11P) No. 7
Test point 2	PCM connector A (51P) No. 2

Test point 1	EPS control unit connector A (11P) No. 9
Test point 2	PCM connector A (51P) No. 1

Is there continuity?

YES

The F-CAN_H and F-CAN_L wires are OK. Go to step 3.

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.

EPS control unit connector A (11P)

PCM connector A (51P)

2. Update the EPS control unit if it does not have the latest software.

3. Clear the DTC with the HDS.

4. Turn the vehicle to the OFF (LOCK) mode, then start the engine.

5. Check for DTCs with the HDS.

DTC Description	DTC	Freeze Frame
23-04 CAN Bus-Off Malfunction

Is DTC 23-04 indicated?

YES

Replace the EPS control unit .

Troubleshooting is complete.