Fuel Metering Valve, Checking

Fuel Metering Valve, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuel Pump (FP) Control Module (J538)OK

• Fuses for engine electronics OK.

• Fuel filter OK.

• Parking brake engaged.

• Battery voltage at least 12.5 V.

• Vehicles with automatic transmission, shift selector lever into position "P" or "N".

• All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).

• A/C switched off.

• The fuel tank at least 1/4 full.

• Ignition switched off.

Test procedure

- Perform a preliminary check to verify the customer's complaint. Refer to => [ Preliminary Check ] Preliminary Check.





- Remove three screws - arrows - and the engine lifting eye to gain access to the electrical harness connector.





- Disconnect the Fuel Metering Valve (N290)electrical harness connector - 2 - from the Fuel Metering Valve (N290).

Checking internal resistance





- Using a Multimeter , check the Fuel Metering Valve (N290) terminals for resistance.





Specified value: 450 to 1000 ohms.

If specified value is not obtained:

- Replace the Fuel Metering Valve (N290)

If specified value is obtained:

Checking voltage





- Using a Multimeter , check the wiring connection from the Fuel Metering Valve (N290)electrical harness connector terminals for voltage.





- Operate the starter briefly.

Specified value: Battery voltage.

- Switch the ignition off.

If there is no voltage:

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

- Connect the Test Box 105 Pin (VAG1598/42) with Adapter Cable (1598/39-1).

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

- Remove the Engine Control Module (ECM) (J623) => [ Engine Control Module, Replacing ] Engine Control Module, Replacing.





- Using a Multimeter , check the following wire connections for an open circuit.









Specified value: 1.5 ohms max.

If the specification is not obtained:

- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

If specified value is not obtained:

- If necessary, repair the wiring connection.

If no malfunctions are found in wiring:

- Replace the Engine Control Module (ECM) (J623).

- Assembly is performed in the reverse of the removal.

After 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 ] Monitors, Trips, Drive Cycles and Readiness Codes.