Four Wheel Drive Selector Switch: Testing and Inspection

JF1A TRANSFER: 4WD CONTROL SWITCH:

ON-VEHICLE INSPECTION

1. INSPECT 4WD CONTROL SWITCH
(a) Check the harness and connector (ECU - battery and body ground).





(1) Measure the voltage and resistance according to the value(s) in the table below.
Standard voltage:





If there is a malfunction, inspect the harness or connector. If the harness is malfunctioning, repair or replace harness or connector. If the harness or connector is normal, replace the 4WD control ECU (Removal).
Standard resistance:





If there is a malfunction, repair or replace the harness or connector.
(b) Check the harness and connector (switch - ECU).
(1) Disconnect the A25 ECU connector.
(2) Disconnect the L1 switch connector.
(3) Measure the resistance according to the value(s) in the table below.





Standard resistance:





If the resistance is not as specified, repair or replace the harness or connector.
(c) Check the 4WD control switch.
(1) Turn the ignition switch OFF.
(2) Connect the L1 switch connector.
(3) Connect the A25 and A26 ECU connectors.





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





If the voltage is not as specified, check the 4WD control ECU.
(d) Check the 4WD control ECU.
(1) Disconnect the L1 switch connector.





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





If the voltage is not as specified, replace the 4WD control ECU (Removal). If the voltage is normal, replace the 4WD control switch.