1) Connect the scan tool.
2) Lift up the vehicle.
3) Turn OFF the ignition switch for 30 seconds or more.
4) Operate the vehicle with the following conditions met.
4WD models
2WD models
5) Observe the DTC information with a scan tool. Is a DTC set?
Yes
=>Go to Prioritized DTC check.
No
Go to Intermittent conditions of rear differential lock control system.
Refer to "204.Driveline, Axle 17D.Symptom intermittent conditions of differential lock control system".
1) Turn OFF the ignition switch for 30 seconds or more.
2) Turn ON the ignition switch.
3) Observe the DTC information with a scan tool. Is DTC P1A00[13] or P1A00[19] set at the same time?
Yes
Go to the applicable DTC diagnosis.
No
=>Go to Differential lock coil inspection.
1) Turn OFF the ignition switch.
2) Disconnect the differential lock coil harness connector (R39).
3) Measure the resistance of the differential lock coil harness connector terminal (pins 1 and 2 of R39) with a DMM. Is the resistance equal to the specified value?
Value: 2.65 to 2.95 Ω 20°C {68°F}
Refer to "LHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
4) Inspect the differential lock coil circuit for a short to the ground circuit. Is the result normal?
5) Are all of the results normal?
Yes
=>Go to Differential lock coil high-side control circuit inspection.
No
Replace the differential lock coil or repair the circuit as necessary.
Refer to "3.Driveline, Axle 3B.Differentials rear final drive (φ220 mm { 8.66 in })(differential lock) removal".
Refer to "3.Driveline, Axle 3B.Differentials rear final drive (φ220 mm { 8.66 in })(differential lock) disassembly".
Refer to "3.Driveline, Axle 3B.Differentials rear final drive (φ220 mm { 8.66 in })(differential lock) inspection".
Refer to "3.Driveline, Axle 3B.Differentials rear final drive (φ220 mm { 8.66 in })(differential lock) reassembly".
Refer to "3.Driveline, Axle 3B.Differentials rear final drive (φ220 mm { 8.66 in })(differential lock) installation".
1) Turn OFF the ignition switch.
2) Disconnect the rear differential lock control unit harness connector (C57).
3) Inspect the wire harnesses and connectors for the following. Is the result normal?
Wire harness to be inspected
Refer to "LHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Inspection items
Yes
=>Go to Differential lock coil low-side control circuit inspection.
No
Repair the circuit as necessary.
1) Inspect the wire harnesses and connectors for the following. Is the result normal?
Wire harness to be inspected
Refer to "LHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Refer to "RHD Differential Lock" in the ETM (wiring diagram). (Open using the ETM viewer.).
Inspection items
Yes
=>Go to Rear differential lock control unit replacement.
No
Repair the circuit as necessary.
Note
Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit removal".
Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit installation".
Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control rear differential lock control unit setting".
Procedure completion
1) Clear the DTC with a scan tool.
2) Turn OFF the ignition switch for 30 seconds or more.
3) Operate the vehicle with the following conditions met.
4WD models
2WD models
4) Observe the DTC information with a scan tool.