Turbocharger Recirculating Valve, Checking

Turbocharger Recirculating Valve, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Motronic Engine Control Module (ECM) ( J220 ) fuses OK.





• Battery voltage at least 12.5 volts.

• All electrical consumers such as, lights and rear window defroster, switched off.

• On vehicles with automatic transmission, selector lever in position " P" or "N".

• A/C switched off.

• Ground (GND) connections between engine/transmission/chassis OK.

• Ignition switched off.

Procedure

- Remove the engine cover with air filter Refer to Fuel Injection and Ignition Repair Information.





Checking internal resistance

- Disconnect the Turbocharger Recirculating Valve ( N249) electrical harness connector- 2 -.





- Using a multimeter, check the Turbocharger Recirculating Valve (N249) terminals 1 to 2 for resistance.





Specified value: 20 to 30 ohms (at approx. 20° C)

If the specification was not obtained:

- Replace the Turbocharger Recirculating Valve ( N249) Refer to Engine Mechanical Repair Information.

If the specification was obtained:

Checking Voltage supply

- Using a multimeter, check the Turbocharger Recirculating Valve (N249) electrical harness connector terminal 1 to Ground (GND).









- Operate the starter briefly.

Specified value: battery voltage.

- Switch the ignition off.

If the specified value was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

- Install the test box. Refer to Fuel Injection and Ignition Repair Information.

If the manufacturers test box is not being used. Perform the following step.

- Remove the Motronic Engine Control Module (ECM) ( J220). Refer to => [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

- Using a multimeter, check the Turbocharger Recirculating Valve (N249) electrical harness connector terminal 2 to Motronic Engine Control Module (ECM) (J220 )electrical harness connector terminal 105 for an open circuit.









Specified value: 1.5 ohms max.

If the specification is not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:

- Replace the Motronic Engine Control Module (ECM) (J220). Refer to => [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

- Install the engine cover with air filter. Refer to Fuel Injection and Ignition Repair Information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.

- End of diagnosis.