Component Tests and General Diagnostics

Drive-by-wire Control System Inspection

Engine coolant temperature compensation inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Select the following PIDs:
- ECT
- IAT
- RPM

3. Verify that the engine is cold, then start the engine.
4. Verify that the engine speed decreases as the engine warms up.
- If the engine speed does not decrease or decreases slowly, inspect the following:
- ECT sensor and related wiring harness
- Throttle body and related wiring harness

Load compensation inspection

1. Start the engine and run it at idle.
2. Connect the WDS or equivalent to the DLC-2.
3. Verify that P0506 or P0507 is not displayed.
- If P0506 or P0507 are displayed, perform DTC inspection.

4. Select the RPM PID.

NOTE: Excludes temporary idle speed drop just after the loads are turned on.




5. Verify that the engine speed is within the specification under each load condition.
- If load condition is not as specified, inspect the following:
- A/C switch and related wiring harness (See CLIMATE CONTROL UNIT INSPECTION.)
- Fan switch and related wiring harness (See CLIMATE CONTROL UNIT INSPECTION.)
- CAN signal and related wiring harness (P/S operation signal)