DTC P1A00[13] Differential Lock Coil Circuit (Disconnection) (Differential Lock)

1. Differential lock control system check

Refer to "53.Driveline Control 3A.Troubleshooting(Differential Lock) diagnostic system check - differential lock controls".

2. Current DTC check

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 Differential lock coil high-side control circuit voltage 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".

3. Differential lock coil high-side control circuit voltage check

1) Turn OFF the ignition switch.

2) Disconnect the differential lock coil harness connector (R39).

3) Connect a test lamp between the differential lock coil high-side control circuit (pin 1 of R39) and the body ground.

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) Turn ON the ignition switch. Does the test lamp illuminate?

Yes

=>Go to Differential lock coil low-side control circuit voltage check.

No

=>Go to Inspection for open circuit in differential lock coil high-side control circuit.

4. Differential lock coil low-side control circuit voltage check

1) Turn OFF the ignition switch.

2) Connect a test lamp between the high-side and low-side control circuits (pins 1 and 2 of R39) of the differential lock coil.

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.).

3) Turn ON the ignition switch. Does the test lamp illuminate?

Yes

=>Go to Differential lock coil harness connector inspection.

No

=>Go to Inspection for open circuit in differential lock coil low-side control circuit.

5. Inspection for open circuit in differential lock coil high-side control circuit

1) Disconnect the rear differential lock control unit harness connector (C57).

2) Inspect the differential lock coil high-side control circuit between the rear differential lock control unit (pin 8 of C57) and the differential lock coil (pin 1 of R39) for an open circuit or high resistance. Is the result normal?

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.).

Yes

=>Go to Rear differential lock control unit harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. Inspection for open circuit in differential lock coil low-side control circuit

1) Inspect the differential lock coil low-side control circuit between the rear differential lock control unit (pin 7 of C57) and the differential lock coil (pin 2 of R39) for an open circuit or high resistance. Is the result normal?

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.).

Yes

=>Go to Rear differential lock control unit harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. Differential lock coil harness connector inspection

1) Inspect for poor connections at the differential lock coil harness connector (pins 1 and 2 of R39). Is the result normal?

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.).

Yes

Replace the differential lock coil.

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".

=>Go to Repair verification.

No

Repair the connections as necessary.

=>Go to Repair verification.

8. Rear differential lock control unit harness connector inspection

1) Inspect for poor connections at the rear differential lock control unit harness connector (pins 7 and 8 of C57). Is the result normal?

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.).

Yes

=>Go to Rear differential lock control unit replacement.

No

Repair the connections as necessary.

=>Go to Repair verification.

9. Rear differential lock control unit replacement

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

=>Go to Repair verification.

10. Repair verification

1) Clear the DTC with a 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.