U0230

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U0230: Lost Communication with Rear Gate Module

DTC U0230 - Lost Communication with Rear Gate Module

DESCRIPTION

HINT: For vehicles with power back door system only.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTICE:
- Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
- After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
- Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.
HINT:
- Operating the ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
- Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

PROCEDURE

1. CHECK FOR DTC
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on (IG).
(c) Check for DTC.
HINT: If the CAN MS bus communication error DTC U1002 is output, troubleshooting for U1002 and check for malfunctions in the CAN MS bus.

Result:

B -- GO TO GO TO DTC CHART (U1002)
A -- Continue to next step.
2. CHECK CAN BUS LINE FOR DISCONNECTION (BACK DOOR ECU BRANCH WIRE)
(a) Disconnect the back door ECU connector.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER SLIDE DOOR ECU RH (MPX1, MPX2)
OK -- Continue to next step.
3. CHECK WIRE HARNESS

(a) Disconnect the back door ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BACK DOOR MOTOR UNIT (BACK DOOR ECU)