DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .

DTC (PGM-FI)

• 1. Problem verification:

  - 1. Turn the vehicle to the ON mode.

  - 2. Clear the DTC with the HDS.

  - 3. Check for Pending or Confirmed DTCs with the HDS.

  DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
  U0155 F-CAN Malfunction (PCM-Gauge Control Module)

  Is DTC U0155 indicated?

  YES 

  The failure is duplicated. Go to step 2.

  NO 

  Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module 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.

• 2. Gauge control module DTC check:

  - 1. Check for gauge control module DTCs with the HDS.

  DTC Description	DTC
  U0029 F-CAN communication line error
  U0100 Gauge control module lost communication with ENG/AT

  Is DTC U0029 and/or U0100 indicated?

  YES 

  Go to step 3.

  NO 

  Do the gauge control module self-diagnostic function .

• 3. Open wire check (F-CAN_H line):

  - 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.

  PCM connector A (51P)

  Gauge control module connector A (32P)

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

  Test condition	Vehicle OFF (LOCK) mode
  	PCM connector A (51P): disconnected
  	Gauge control module connector A (32P): disconnected
  Test point 1	Gauge control module connector A (32P) No. 19
  Test point 2	PCM connector A (51P) No. 2

  Is there continuity?

  YES 

  The F-CAN_H wire is OK. Go to step 4.

  NO 

  Repair an open in the F-CAN_H wire between the PCM (A2) and the gauge control module.

• 4. Open wire check (F-CAN_L line):

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

  Test condition	Vehicle OFF (LOCK) mode
  	PCM connector A (51P): disconnected
  	Gauge control module connector A (32P): disconnected
  Test point 1	Gauge control module connector A (32P) No. 20
  Test point 2	PCM connector A (51P) No. 1

  Is there continuity?

  YES 

  The F-CAN_L wire is OK. Substitute a known-good gauge control module , then recheck. If DTC U0155 is not indicated after the gauge control module was substituted, replace the original gauge control module .

  NO 

  Repair an open in the F-CAN_L wire between the PCM (A1) and the gauge control module.