EGR Valve: Testing and Inspection

COMPONENTS FOR REMOVAL AND INSTALLATION





1. DISCONNECT NEGATIVE (-) TERMINAL CABLE FROM BATTERY.

CAUTION: Work must be started after 90 seconds from the time the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected from the battery.

2. DISCONNECT EGR VALVE CONNECTOR.





3. INSPECT EGR VALVE RESISTANCE.
- Using an ohmmeter, measure the resistance between terminal B1 (or B2) and other terminals (S1. S2, S3 and S4).

Resistance (Cold): 19.9 - 23.4 Ohms

4. DRAIN ENGINE COOLANT.
5. REMOVE EGR VALVE.





- Disconnect the following hoses from the EGR valve:
- Water bypass hose from Idle Air Control (IAC) valve.
- Water bypass hose from rear water bypass joint.





- Remove the 2 nuts, EGR valve and gasket.





6. INSPECT EGR VALVE.
- Visually inspect EGR valve.
- Check for sticking and heavy carbon deposits.
- If a problem is found, replace the EGR valve assembly.
- Inspect EGR valve operation.





- Apply battery voltage to terminal B1 and B2, and while repeatedly grounding (S4) - (S4 and *S3) (S3 and*S2) - (S2 and SS1) - (S1 and *S4) in sequence, and check that the valve moves toward the open position.

HINT: Keep the terminal marked with an asterisk (*) grounded while proceeding to the next grounding.





- Apply battery voltage to terminal B1 and B2, and while repeatedly grounding (*S1) - (S1 and *S2) - (S2 and *S3) - (S3 and *S4) - (S4 and S1) in sequence, and check that the valve moves toward the closed position.

HINT:
- Keep the terminal marked with an asterisk (S) grounded while proceeding to the next grounding.
- Perform this operation after opening the valve by performing step (a) above.
- If operation is not as specified, replace the EGR valve assembly.





7. REINSTALL EGR VALVE.
- Place a new gasket on the EGR valve adaptor.

NOTICE:
- Do not touch the adaptor and EGR valve surfaces of the gasket with your hand.
- Align the port holes of the gasket and adaptor. Be careful of the installation direction.





- Install the EGR valve with the 2 nuts.

Torque: 18 Nm (13 ft lb)





- Connect the following hoses to the EGR valve:
- Water bypass hose (from IAC valve).
- Water bypass hose (from rear water bypass joint).
8. RECONNECT EGR VALVE CONNECTOR.
9. RECONNECT NEGATIVE (-) TERMINAL CABLE TO BATTERY.
10. REFILL WITH ENGINE COOLANT.