Fuel Pressure Sensor, 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 .

Checking voltage

-- Disconnect the 14 pin electrical harness connector -3- for Fuel Pressure Sensor -G247- from the left rear of the engine.

-- Using a Multimeter --, check the Fuel Pressure Sensor -G247- for voltage at the 14 pin electrical harness connector terminals.

Fuel Pressure SensorG247 Electrical Harness Connector Terminal	Specified value
1 to Battery positive (+)	Battery positive (+)
2 to Ground (GND)	about 5 V
3 to Ground (GND)	about 5 V

If specified value is obtained:

-- Replace the Fuel Pressure Sensor -G247-. .

If the specified value was not obtained:

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 Pressure SensorG247 Electrical Harness Connector Terminal	Engine Control Module (ECM)J623 Electrical Harness Connector Terminal
1	40
2	59
3	29

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 necessary, repair the wiring connection.

If no malfunctions are found in wiring:

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

-- 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 .