Fuel Pressure Metering 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 Metering Valve -N290- electrical harness connector.

Checking internal resistance

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

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

If The Specified Value Was Not Obtained: 

-- Replace the Fuel Pressure Metering Valve -N290-.

If The Specified Value Was Obtained: 

-- Turn the ignition switch ON.

-- Connect a multimeter red lead to terminal 2 of the Fuel Pressure Metering Valve -N290- and the black 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 Metering Valve -N290- and fuse 14 (2010 Models) or fuse 7 (2011 Models) in Fuse Panel B for an open, short or high resistance. Refer to Appropriate Wiring Diagrams for Pin/fuse locations.

-- 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 Metering Valve -N290- and the black meter lead to ground.

Specified Value: Near 3.2 V (+/-.5 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 Metering Valve -N290- electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 terminal 60 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:

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 .