Dtc U0327 Software Incompatibility With Vehicle Security Control Module

Power Source Network. Corolla. Zre142 Aze141
Networking. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK CAN MS BUS WIRE (CERTIFICATION ECU)

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

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.

DTC No.
DTC Detection Condition
Trouble Area
U0327
No communication from certification ECU continues
  1. Certification ECU power source circuit
  2. Certification ECU
  3. Certification ECU branch wire or connector

WIRING DIAGRAM


Corolla. Zre142 Aze141.Networking.Lin Communication System. Dtc U0327 Software Incompatibility With Vehicle Security Control Module


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance between CAN bus main wires and CAN bus branch wires.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  3. 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:
  1. 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.
  2. 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 may help determine the cause of the malfunction.
1.CHECK DTC

  1. Check for DTCs.

    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 (COROLLA_ZRE142 RM000002DX8092X.html).
    Result:
    Result
    		Proceed to
    U1002 is not output
    		A
    U1002 is output
    		B


B
GO TO DTC CHART (COROLLA_ZRE142 RM000002B6V03LX.html)
A


2.CHECK CAN MS BUS WIRE (CERTIFICATION ECU)

  1. Turn the ignition switch off.



    Corolla. Zre142 Aze141.Networking.Lin Communication System. Dtc U0327 Software Incompatibility With Vehicle Security Control Module

  1. Disconnect the certification ECU connector from the certification ECU.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E36-27 (CANH) - E36-28 (CANL)
    		Ignition switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Certification ECU)


NG
REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU)
OK


3.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    Corolla. Zre142 Aze141.Networking.Lin Communication System. Dtc U0327 Software Incompatibility With Vehicle Security Control Module

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E36-17 (E) - Body ground
    		Always
    		Below 1 Ω

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E36-18 (IG) - Body ground
    		Ignition switch ON
    		10 to 14 V
    E36-1 (+B) - Body ground
    		Always
    		10 to 14 V
    E36-19 (ACC) - Body ground
    		Ignition switch ACC
    		10 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Certification ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CERTIFICATION ECU