4WD Control ECU Communication Stop Mode

NOTICE:

• Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
• Turn the ignition switch off before inspecting CAN bus wires for a ground short.
• After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
• 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 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 may help determine the cause of the malfunction.

1. CHECK OPEN IN CAN BUS WIRE (4WD CONTROL ECU BRANCH LINE)

(a) Turn the ignition switch off.

(b) Disconnect the 4WD control ECU connector. Text in Illustration *1 Front view of wire harness connector (to 4WD Control ECU)

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

Standard Resistance:

NG

REPAIR OR REPLACE 4WD CONTROL ECU BRANCH WIRE OR CONNECTOR

OK

1. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Switch Condition Specified Condition D38-11 (IG1) - Body ground Ignition switch ON 11 to 14 V Text in Illustration *1 Front view of wire harness connector (to 4WD Control ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

OK

1. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

(a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition D38-23 (GND) - Body ground Always Below 1 Ω Text in Illustration *1 Front view of wire harness connector (to 4WD Control ECU)

OK

REPLACE 4WD CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)