Wastegate Frequency Valve

1. Turn ignition on. Using a spare fuse, jumper the contacts on the fuel pump relay for at least five seconds.
2. Check for a code 4433 on the display. If fuel pump runs, proceed to step 3. If fuel pump does not run, check the operation of the fuel pump relay.
3. With the ignition on, using a spare fuse, jumper the contacts on the fuel pump relay for at least five seconds. Check for a code 4441 on the display.
4. If the duty cycle maintains a fixed value of 50%, proceed to step 5. If the value does not hold 50%, check the operation of the fuel system frequency valve.
5. With the ignition on, using a spare fuse, jumper the contacts on the fuel pump relay for at least five seconds. Check for a code 4442 on the display. If the valve does not click, proceed to step 8. If the valve clicks, unplug the harness connector to the wastegate valve.
6. Using a suitable led tester, connect one test lead to the blue/black wire and the other test lead to the green/yellow wire of the frequency valve terminal connector.

Fig. 4 Three Terminal Plug Pin Designations:

7. With the engine running at idle, unplug the connector at the throttle body. Using a jumper wire, momentarily jumper terminals 2 and 3 of the throttle body switch connector, Fig. 4. The led light should illuminate at least briefly. If the light doesn't act as outlined above, check the integrity of the circuit leading to the wastegate frequency valve.
8. Unplug the connector to the wastegate frequency valve and connect a suitable led tester to the terminals of the harness connector. Repeat the test sequence until code 4442 is displayed.
9. If tester is illuminated or flickers, replace the wastegate frequency valve. If the lamp does not illuminate or flicker, check the available voltage between the frequency valve harness connector and ground.
10. If battery voltage is not present, check the integrity of the circuit. If battery voltage is present, remove the ECU cover (located in footwell of the front passenger compartment).
10. Check for continuity between pin 19 of the ECU connector and the green/yellow wire of the frequency valve connector. If the reading is about 0.2 ohms, replace the ECU. If the voltage is not about 0.2 ohms, check for an open circuit between the two connectors.