Checking Activation

1. Switch ignition off.
2. Disconnect 2-pin harness connector from two-way valve for EGR.
3. Connect voltage tester using jumper cables from connector test kit to connector terminals.
4. Start engine and let idle.

   LED must light up.

5. Slowly increase engine speed.

   LED light most go out for 2 seconds and then light up again.

6. Continue to increase engine speed until EGR part throttle switch closes.

   LED must go out.

If control is OK, check EGR two-way valve or EGR valve.

If control is not OK, check engine coolant temperature sensor or check EGR part throttle switch.

If no malfunction is detected for engine temperature or for EGR part throttle switch, check wiring using Electrical Wiring Diagrams, Troubleshooting & Component locations, or replace automatic glow time control module, if necessary.