Inspection Procedure
WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Turn the ignition switch OFF before measuring the resistances of the main wire and the 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 for at least 1 minute and do not operate the ignition switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
- CHECK CAN BUS LINE FOR DISCONNECTION (4WD CONTROL ECU BRANCH WIRE)
- Disconnect the E57 4WD control ECU connector.
- Measure the resistance of the wire harness side connector.
Standard resistance
RESISTANCE SPECIFICATIONTester Connection Condition Specified Condition E57-14 (CANH) - E57-16 (CANL) Ignition switch OFF 54 to 69 Ω
NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO 4WD CONTROL ECU (CANH, CANL)
OK: Go to next step.
- CHECK WIRE HARNESS (4WD CONTROL ECU - BATTERY AND BODY GROUND)
- Disconnect the E57 4WD control ECU connector.
- Measure the resistance of the wire harness side connector.
Standard resistance
RESISTANCE SPECIFICATIONTester Connection Specified Condition E57-23 (GND) - Body ground Below 1 Ω - Measure the voltage of the wire harness side connector.
Standard voltage
VOLTAGE SPECIFICATIONTester Connection Condition Specified Condition E57-9 (BSLC) - Body ground Always 10 to 14 V E57-11 (IG1) - Body ground Ignition switch ON 10 to 14 V
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE 4WD CONTROL ECU