Fuel Pressure Regulator Valve Checking

Observe all safety precautions: SAFETY PRECAUTIONS

View clean working conditions: CLEAN WORKING CONDITIONS

Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .

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

See Appropriate Wiring Diagram Information for component locations and connector views.

Special Tools And Workshop Equipment 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.

Checking internal resistance

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

Specified Value: Near 4.1 Ω (At Approx. 20° C)

If The Specified Value Was Not Obtained:

-- Replace the Fuel Pressure Regulator Valve -N276-.

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. Refer to Appropriate Wiring Diagrams for Pin locations.

-- 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 14 in Fuse Panel B 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 3.40 V.

-- Turn the ignition switch OFF.

If The Specified Value Was Not Obtained:

Checking wiring

-- Remove the Motronic Engine Control Module (ECM) -J623-.

-- Using a multimeter, check the Fuel Pressure Regulator Valve -N276- electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 45 terminal for a short to ground or voltage, high resistance or an open circuit. Refer to Appropriate Wiring Diagrams for Pin locations.

Specified Value: 1.5 Ω 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 appropriate Service Information for removal and installation procedures.

Final Procedures

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

Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .