DTC Troubleshooting: U0104 (L4, PGM-FI System: With ACC)

DTC Troubleshooting: U0104

DTC U0104: F-CAN Malfunction (PCM - ACC Unit/Multipurpose Camera Unit)

NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
U0104 F-CAN Malfunction (PCM - ACC Unit/Multipurpose Camera Unit)

DTC check:

DTC check

?1.	Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
U0029 F-CAN Malfunction (BUS-OFF(PCM))
U0104 F-CAN Malfunction (PCM - ACC Unit/Multipurpose Camera Unit)

Are DTC U0029 and U0104 indicated at the same time?


	YES

Do the troubleshooting for DTC U0029.?


	NO

Go to step 2.

Problem verification:

Problem verification

?1.	Clear the DTC with the HDS.

?2.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
U0104 F-CAN Malfunction (PCM - ACC Unit/Multipurpose Camera Unit)

Is DTC U0104 indicated?


	YES

Go to step 3.


	NO

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the multipurpose camera unit and the PCM. 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.?

ACC system check:

ACC system check

?1.	Check for communication to the ACC system with the HDS.

Does the HDS communicate with the multipurpose camera unit?


	YES

Go to step 4.


	NO

Go to the symptom troubleshooting for ACC indicator (amber) does not go off.?

Open wire check (F-CAN_H line):

Open wire check (F-CAN_H line)

?1.	Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.	Jump the SCS line with the HDS.

?3.

Disconnect the following connectors.

PCM connector A (51P)

Multipurpose camera unit 20P connector

?4.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	PCM connector A (51P): disconnected
	Multipurpose camera unit 20P connector: disconnected
Test circuit	F-CAN_H
Test point 1	Multipurpose camera unit 20P connector No. 2 (WHT)
Test point 2	PCM connector A (51P) No. 2 (WHT)

Is there continuity?


	YES

Go to step 5.


	NO

Repair an open in the F-CAN_H wire between the PCM (A2) and the multipurpose camera unit.?

Open wire check (F-CAN_L line):

Open wire check (F-CAN_L line)

?1.

Check for continuity between test points 1 and 2.

Test condition	IG LOCK (0) or OFF mode
	PCM connector A (51P): disconnected
	Multipurpose camera unit 20P connector: disconnected
Test circuit	F-CAN_L
Test point 1	Multipurpose camera unit 20P connector No. 13 (RED)
Test point 2	PCM connector A (51P) No. 1 (RED)

Is there continuity?


	YES

Replace the multipurpose camera unit.?


	NO

Repair an open in the F-CAN_L wire between the PCM (A1) and the multipurpose camera unit.?