DTC P0800[45] Flash ROM Internal Checksum Error (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 TCCM replacement.

No

=>Go to Repair verification.

3. TCCM replacement

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control TCCM removal".

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control TCCM installation".

Refer to "3.Driveline, Axle 3Z.Driveline, Axle Electrical Control TCCM setting".

Procedure completion

=>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) Turn ON the ignition switch.

4) Drive the vehicle in 2H, 4H, and 4L modes respectively.

5) Observe the DTC information with a scan tool.