Fuel Metering Valve, Checking

The following procedure is used to diagnose the Fuel Metering Valve -N290- which is controlled by Engine Control Module -J623-.

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements

• The Engine Component Power Supply Relay -J757- OK.
• The Fuse -SA5- OK.
• The fuel filter OK.
• The parking brake engaged.
• The battery voltage at least 12.5 V.
• The selector lever of automatic transmission in position "P" or "N".
• All electrical consumers switched OFF.
• A/C switched OFF.
• The fuel tank at least ¹ /₄ filled.
• The ignition switched OFF.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- Remove the engine covers. Refer to the appropriate Service Information.

-- Located on the high pressure pump, right side of cylinder head.

-- Disconnect the Fuel Metering Valve -N290- electrical harness connector -2-.

Checking internal resistance 

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

Specified value: 450 to 1000 Ω.

If the specified value was Not obtained:

-- Replace the Fuel Metering Valve - N290-. Refer to the appropriate Service Information.

-- Go to Final procedures.

If the specified value was obtained:

Checking voltage 

-- Switch the ignition ON.

-- Using a Multimeter, check the Fuel Metering Valve - N290- electrical harness connector terminal 1 to Ground (GND) for voltage.

Specified value: Battery voltage.

-- Switch the ignition ON.

If the specified value was Not obtained:

-- Check the wiring from the Fuel Metering Valve -N290- electrical harness connector terminal 1 to the appropriate fuse. Refer to appropriate System Wiring Diagram for fuse positions for an open circuit or a short circuit to Ground (GND).

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

-- If necessary, repair the faulty wiring connection.

-- Repair the circuit and replace any open fuses.

-- Go to Final procedures.

If the specified value was obtained:

Checking wiring connections 

-- Remove the Engine Control Module -J623-. Refer to appropriate Service Information.

-- Using a multimeter, check the Fuel Metering Valve -N290- electrical harness connector terminal 2 to the Engine Control Module -J623- electrical harness connector T60 terminal 60 for resistance.

Fuel Metering Valve -N290- electrical harness connector terminal:	Engine Control Module -J623- electrical harness connector T60 terminal:
2	60

Specified value: 1.5 Ω Max.

If the specified value was Not obtained:

-- Check the wiring for an open circuit, a short circuit to each other, Battery voltage or Ground (GND).

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return: 

Repair complete, Generate readiness code. Refer to READINESS CODE .

-- End diagnosis.

If the DTC returns and no malfunction is found in the wiring and voltage supply was OK:

-- Remove the Engine Control Module -J623-. Refer to appropriate Service Information.

Assembly is performed in the reverse order of the removal, note the following:

Final procedures 

-- Reinstall the engine cover with air filter, if necessary. Refer to the appropriate Service Information.

-- After the 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 .