DTC P0800[A3] Battery Voltage High Supply (4WD models)

1. Transfer control system check

Refer to "53.Driveline Control 3A.Troubleshooting(4WD models) diagnostic system check-transfer case controls".

2. Current DTC check

1) Connect the scan tool.

2) Turn OFF the ignition switch for 30 seconds or more.

3) Start the engine.

4) Observe the DTC information with a scan tool. Is a DTC set?

Yes

=>Go to Charging system inspection.

No

Go to Intermittent conditions of transfer case control system.

Refer to "204.Driveline, Axle 17D.Symptom intermittent conditions of transfer case control system".

3. Charging system inspection

1) Inspect the charging system. Is the result normal?

Refer to "1.Engine 1J.Electrical(RZ4E-TC) generator inspection".

Refer to "202.Engine 15D.Symptom(RZ4E-TC) defect of charging system".

Refer to "1.Engine 1J.Electrical(4JJ3 without DPD) generator inspection".

Refer to "202.Engine 15D.Symptom(4JJ3 without DPD) defect of charging system".

Refer to "1.Engine 1J.Electrical(4JJ3 with DPD) generator inspection".

Refer to "202.Engine 15D.Symptom(4JJ3 with DPD) defect of charging system".

Yes

Go to Intermittent conditions of transfer case control system.

Refer to "204.Driveline, Axle 17D.Symptom intermittent conditions of transfer case control system".

No

Repair the charging system.

Refer to "1.Engine 1J.Electrical(RZ4E-TC) generator removal".

Refer to "1.Engine 1J.Electrical(RZ4E-TC) generator installation".

Refer to "1.Engine 1J.Electrical(4JJ3 without DPD) generator removal".

Refer to "1.Engine 1J.Electrical(4JJ3 without DPD) generator installation".

Refer to "1.Engine 1J.Electrical(4JJ3 with DPD) generator removal".

Refer to "1.Engine 1J.Electrical(4JJ3 with DPD) generator installation".

=>Go to Repair verification.

4. Repair verification

1) Clear the DTC with a scan tool.

2) Turn OFF the ignition switch for 30 seconds or more.

3) Start the engine.

4) Observe the Battery Voltage parameter on the scan tool. Is the Battery Voltage parameter more than or equal to the specified value?

Standard: 18.0 V

Yes

=>Go to Charging system inspection.

No

Observe the DTC information with a scan tool.