55-U0230 POWER GATE CAN TIMEOUT

DTC U0230: Power Gate CAN timeout

caution

If DTC No.U0230 is set in the heater controller assembly (A/C-ECU), diagnose the CAN main bus line.

caution

Whenever the ECU is replaced, ensure that the communication circuit is normal.

DTC SET CONDITION

The heater controller assembly (A/C-ECU) receives air conditioning control-related signals from the power liftgate via the CAN bus lines. If the ECU cannot receive any of the air conditioning control-related signals from the power liftgate, DTC U0230 will be set.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

Connector(s) or wiring harness in the CAN bus lines between the power liftgate and the heater controller assembly (A/C-ECU), the power supply system to the power liftgate, the power liftgate itself, or the heater controller assembly (A/C-ECU) may be defective.

Past trouble

Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the heater controller assembly (A/C-ECU) and the power liftgate, and the power supply system to the power liftgate. For diagnostic procedures, refer to "How to treat past trouble" (Refer to GROUP 00 - How to Treat Past Trouble

note

For a past trouble, you cannot find it by the M.U.T.-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Cope with Intermittent Malfunction

and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow

TROUBLESHOOTING HINT

The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
Malfunction of the liftgate
Malfunction of the heater controller assembly (A/C-ECU)

DIAGNOSIS

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

(1)

caution

To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).

Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III)

(2) Turn the ignition switch to the "ON" position.

(3) Diagnose the CAN bus line.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Is the CAN bus line found to be normal?

Go to Step 2

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

). On completion, go to Step 6

STEP 2. Check whether the DTC is set.

Check whether the power liftgate-related DTC is set.

Is the DTC set?

Troubleshoot the power liftgate control unit (Refer to GROUP 42A - Liftgate <vehicles with power liftgate> - Diagnosis Code Chart

Go to Step 3

STEP 3. Check whether the DTC is set again.

Check if a DTC, which relates to CAN communication-linked systems below, is set.

ETACS-ECU
U0230: Power Gate CAN timeout

Is the DTC set?

Go to Step 4

Go to Step 5

STEP 4. Check whether the DTC is set again.

Recheck if the DTC is set

(1) Erase the DTC.

(2) Ignition switch: LOCK (OFF) to ON

(3) Check if the DTC is set

Is the DTC set?

Replace the power liftgate, and then go to Step 6

A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the power liftgate and the heater controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction

STEP 5. Check whether the DTC is set again.

Recheck if the DTC is set.

(1) Erase the DTC.

(2) Ignition switch: LOCK (OFF) to ON

(3) Check if the DTC is set

Is the DTC set?

Replace the heater controller assembly (A/C-ECU), and then go to Step 6

STEP 6. Check whether the DTC is set again.

Recheck if the DTC is set.

(1) Erase the DTC.

(2) Ignition switch: LOCK (OFF) to ON

(3) Check if the DTC is set.

Is the DTC set?

Return to Step 1

The procedure is complete.