Low 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 electrical harness connector -1- from the Low Fuel Pressure Sensor -G410-.
-- Using aMultimeter --, check the electrical harness connector terminals for voltage.
| Low Fuel Pressure SensorG410Harness Connector Terminal | Specified Value |
|---|---|
| 1 to Battery positive (+) | Battery positive (+) |
| 2 to Ground (GND) | 5 V or less |
| 3 to Ground (GND) | about 5 V |
If specified value is obtained:
-- Replace the Low Fuel Pressure Sensor -G410-.
Refer to Component Locations Overview .
The 3.2L 6-Cyl. 4V (BKH) engine is equipped with two different Low Fuel Pressure Sensors -G410- designs. One design is integrated into the high pressure fuel pump and must be replaced as a complete assembly. The second design is not integrated into the high pressure fuel pump and may be replaced separately.
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.
| Low Fuel Pressure SensorG410Harness Connector Terminal | Engine Control Module (ECM)J623 Electrical Harness Connector Terminal |
|---|---|
| 1 | 40 |
| 2 | 49 |
| 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:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .