Fuel Pressure Regulator Valve Checking

Fuel Pressure Regulator Valve Checking

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

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.

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 Pressure Regulator Valve (N276) electrical harness connector.- 1 -






Checking internal resistance

- Using a multimeter, check the Fuel Pressure Regulator Valve (N276) terminals 1 to 2 for resistance.

Specified value: Near 4.1 ohms (at approx. 20° C)

If the specified value was not obtained:

- Replace the Fuel Pressure Regulator Valve (N276). Refer to the Repair Manual.

If the specified value was obtained:

- Turn the ignition switch ON.

- Connect a multimeter red lead to terminal 2 of the Fuel Pressure Regulator Valve (N276) and the other meter lead to ground and measure the voltage.

- Turn the ignition switch OFF.

Specified value: Battery voltage.

If the specified value was not obtained:

- Check the circuit between terminal 2 of the Fuel Pressure Regulator Valve (N276) and fuse S 10 for an open, short or high resistance.

- Repair as necessary.

If the specified value was obtained:

- Turn the ignition switch ON.

- Connect a multimeter red lead to terminal 1 of the Fuel Pressure Regulator Valve (N276) and the other meter lead to ground.

Specified value: Near 3.48 V.

- Turn the ignition switch OFF.

If the specified value was not obtained:

Checking wiring

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

- Install the test box.

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

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

- Using a multimeter, check the Fuel Pressure Regulator Valve (N276) electrical harness connector terminal 1 to the Engine Control Module (ECM) (J623) electrical harness connector T105 46 terminal 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 to each other, a short to battery voltage, and a short to ground.

- 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 voltage was not correct:

- Replace the Engine Control Module (ECM) (J623). Refer to the service manual 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 ] Programming and Relearning.