Fuel Metering Valve, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test Requirements 

• Fuel Pump (FP) Control Module -J538- OK
• Fuses for engine electronics OK.
• Fuel filter OK.
• Parking brake engaged.
• Battery voltage at least 12.5 V.
• Vehicles with automatic transmission, shift selector lever into position "P" or "N".
• All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
• A/C switched off.
• The fuel tank at least 1/4 full.
• Ignition switched off.

Test Procedure 

-- Perform a preliminary check to verify the customer's complaint. Refer to PRELIMINARY CHECK .

-- Remove three screws -arrows- and the engine lifting eye to gain access to the electrical harness connector.

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

Checking internal resistance

-- Using aMultimeter --, check the Fuel Metering Valve -N290- terminals for resistance.

Fuel Metering Valve -N290- Electrical Harness Terminals
1 to 2

Specified value: 1.5 to 11 Ω.

If specified value is not obtained:

-- Replace the Fuel Metering Valve -N290-. Refer to Component Locations Overview .

If specified value is obtained:

Checking voltage

-- Using aMultimeter --, check the wiring connection from the Fuel Metering ValveN290electrical harness connector terminals for voltage.

Fuel Metering ValveN290Electrical Harness Connector Terminal	Specified value
1 to Ground (GND)	Battery positive (+)
2 to Battery positive (+)	Battery positive (+)

-- Operate the starter briefly.

Specified value: Battery voltage.

-- Switch the ignition off.

If there is no voltage:

Checking wiring connections

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

-- Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable1598/39-1. Refer to Component Locations Overview .

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

-- Remove the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

-- Using aMultimeter, check the following wire connections for an open circuit.

Fuel Metering ValveN290Electrical Harness Connector Terminal	Engine Component Power Supply Relay -J757- Electrical Harness Connector Terminal
1	2

Fuel Metering ValveN290Electrical Harness Connector Terminal	Engine Control Module (ECM)J623 Electrical Harness Connector Terminal
2	45

Specified value: 1.5 Ω max.

If the specification is not obtained:

-- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

If specified value is not obtained:

-- If necessary, repair the wiring connection.

If no malfunctions are found in wiring:

-- Replace the Engine Control Module (ECM) -J623-.

-- Assembly is performed in the reverse of the removal.

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 .