54Da-DTC U109F Compressor CAN timeout

DTC U109F: Compressor CAN timeout

caution

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.

MONITOR EXECUTION

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

Sensor (The sensor below is determined to be normal)

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

The PHEV-ECU power supply voltage is between 10 and 16 volts for more than 5 seconds.

Judgment Criterion

Unable to receive A/C compressor assembly signals through the CAN bus line for 2.5 seconds.

OBD-II DRIVE CYCLE PATTERN

PROBABLE CAUSES

DIAGNOSIS

STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.

Diagnose the CAN bus lines.

Is the check result normal?

Go to Step 2

Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting

). Then go to Step 4

STEP 2. Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2

(2) Check the DTC.

Is the DTC set?

Replace the A/C compressor assembly (Refer to GROUP 55 - A/C compressor Removal and Installation

). Then go to Step 3

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction

STEP 3. Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2

(2) Check the DTC.

Is the DTC set?

Replace the PHEV-ECU (Refer to

). Then go to Step 4

The procedure is complete.

STEP 4. Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2

(2) Check the DTC.

Is the DTC set?

Retry the troubleshooting.

The procedure is complete.