Tundra 4WD V8-4.6L (1UR-FE) (2010)
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:
(2) 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 See: Control Module/Service and Repair/Removal.
Standard resistance:
(3) 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: