EGR VALVE INSPECTION [L3 R.H.D.]

EGR Control Inspection

Without using WDS or equivalent

1. Inspect for the following:

• EGR pipe clogging

• PCM terminal voltage

- EGR valve signal

- Vehicle speed signal

- Throttle opening signal

- Engine coolant temperature signal

• EGR valve (If it is stuck or not moving smoothly, replace it with a new one.)

Using WDS or equivalent

1. Connect the WDS or equivalent to the DLC-2.

2. Start the engine.

3. Using the "SEGRP" simulation function, operate using Steps 0 (idling) to 52 and verify that the engine speed becomes unstable or the engine stalls.

• If the engine speed does not change, inspect the following.

(1) Stop the engine.

(2) Remove the EGR valve.

(3) Connect the EGR valve connector.

(4) Turn the ignition switch to the ON position.

(5) Using the "SEGRP" simulation function, operate using Steps 0 (idling) to 52.

• If the EGR valve operates, inspect the following.

- EGR pipe clogging

• If the EGR valve does not operate, inspect the following.

- PCM terminal voltage

• EGR valve signal

- EGR valve (If it is stuck or not moving smoothly, replace it with a new one.)

4. Start the engine and warm it up.

5. Place the vehicle on a chassis dynamometer.

6. Monitor the following signals using the PID/data monitor function.

• SEGRP

• RPM

• VSS

• TP

• ECT

7. Verify that the EGR valve step number is 0 while idling.

8. Verify that the EGR valve step number increases when the accelerator pedal is depressed to increase the vehicle speed.

• If it does not increase, inspect the following using the PID/data monitor function.

- VSS

- TP

- ECT

9. Stop the vehicle and, while idling, verify that the EGR valve step number is 0.

On-vehicle inspection

1. Verify that the buzzing sound (valve operation sound) is heard from the EGR valve when cranking the engine.

• If the buzzing sound is not heard, perform the "resistance inspection."

Resistance inspection

1. Disconnect the negative battery cable.

2. Disconnect the EGR valve connector.

3. Measure the resistance between the EGR valve terminals using a tester.

• If it is within the specification, inspect the related harnesses.

• If it is without the specification, replace the EGR valve.