Fuel Metering Valve Checking

Fuel Metering Valve Checking

Observe all safety precautions: => [ Safety Precautions ] Safety Precautions

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Prior to repair work, perform a preliminary check to verify the condition. Refer to => [ Preliminary Check ] Preliminary Check.

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

The fuel rail and connecting pipes after the high pressure pump, are under extremely high pressure! When working on engine or fuel injection system, fuel pressure must be relieved to residual pressure before opening high pressure components. Never attempt to open a fuel connection with the engine running. Refer to the Service Information for the proper procedure.

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

Test requirements

• The Engine Speed (RPM) Sensor (G28) OK.

• Battery voltage at least 12.5 volts.

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

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

• A/C switched off.

• Ground connections between engine/transmission/chassis OK.

• Ignition switched Off.

Start diagnosis

- Remove the engine cover.

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

Checking internal resistance

- Using a multimeter, check the Fuel Metering Valve (N290) terminals 1 to 2 for resistance.

Specified value: Near 3.2 ohms ( +/- 1 ohm)

If the specified value was Not obtained:

- Replace the Fuel Metering Valve (N290). Refer to the Repair Information.

If the specified value was obtained:

- Turn the ignition switch ON.

- Connect a multimeter red lead to terminal 1 of the Fuel Metering Valve (N290) and the black meter lead to ground and measure the voltage.

Specified value: Battery voltage.

- Connect a multimeter red lead to terminal 2 of the Fuel Metering Valve (N290) and the black meter lead to ground.

Specified value: Near 3.49 V (+/-.5 V).

- Turn the ignition switch Off.

If both of the specified values were obtained:

- Replace the Fuel Metering Valve (N290). Refer to the Repair Information.

If any of the specified values were Not obtained:

Checking wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Information.

- Using a multimeter, check the Fuel Metering Valve (N290) electrical harness connector to the Engine Control Module (ECM) (J623) electrical harness connector or Fuse for a short to ground or voltage, high resistance or an open circuit.






Specified value: 1.5 ohms max.

If the specification is Not obtained:

- Check the wires for a short circuit, high resistance or an open.

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

- Repair as necessary.

If no malfunction is detected in the wiring and the terminal 2 voltage was Not correct:

- Replace the Engine Control Module (ECM) (J623). Refer to the service information for removal and installation procedures.

Final procedures

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 Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.