Fuel Pressure Regulator Valve -N276-, 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.

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

Special tools and workshop equipment required 

• Multimeter
• Wiring diagram

Test Requirements 

• The Engine Speed 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: 1.5 to 11 Ω (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

-- Remove the Engine Control Module -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 -J623- electrical harness connector T105 46 terminal for a short to ground or voltage, high resistance or an open circuit.

Fuel Pressure Regulator Valve -N276- electrical harness connector terminal	Engine Control Module -J623- electrical harness connector T105 terminals
1	46

Specified value: 1.5 Ω max.

If the specified value 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 -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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .