Inspection Procedure
WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Turn the ignition switch off before measuring the resistance of the main CAN bus wires and the CAN Bus branch wire.
- 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.
- CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (ECM MAIN WIRE)
- Turn the ignition switch off.
- Disconnect the ECM connector.
- Measure the resistance according to the value (s) in the table below.
Standard Resistance
STANDARD RESISTANCE SPECIFICATIONTester Connection Switch Condition Specified Condition A50-41 (CANH) - A50-49 (CANL) Ignition switch off 108 to 132 Ω NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
- CHECK WIRE HARNESS (POWER SOURCE CIRCUIT)
- Check the ECM power source circuit (2ZR-FE: See ECM POWER SOURCE CIRCUIT , 2AZ-FE: See ECM POWER SOURCE CIRCUIT ).
Result
RESULT REFERENCEResult Proceed to OK (2ZR-FE) A OK (2AZ-FE) B NG C B: REPLACE ECM (2AZ-FE) (See REMOVAL )
C: REPAIR OR REPLACE HARNESS OR CONNECTOR
A: REPLACE ECM (2ZR-FE) (See REMOVAL )