U0327

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U0327: Software Incompatibility with Vehicle Security Control Module

DTC U0327 - Software Incompatibility with Vehicle Security Control Module

DESCRIPTION

The main body ECU will store this DTC when no signals can be received from the certification ECU while the CAN MS main bus is normal.






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 THE VEHICLE TYPE
Result:






B -- GO TO DTC CHART (U1002)
A -- Continue to next step.
2. CHECK FOR DTC
(a) Check for DTC.
HINT: If the CAN MS bus communication error DTC U1002 is output, troubleshoot for U1002 and check for malfunctions in the CAN MS main bus circuit U1002.

Result:






B -- GO TO DTC CHART (U1002)
A -- Continue to next step.
3. CHECK CAN MS BUS WIRE (CERTIFICATION ECU)
(a) Turn the ignition switch off.




(b) Disconnect the connector from the certification ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)




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





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE CERTIFICATION ECU