Low Fuel Pressure Sensor G410 , Checking

Low Fuel Pressure Sensor G410, Checking

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- The Fuel Pump (FP) Control Module J538 OK.
- The Engine Control Module (ECM) J623 fuses OK.
- The fuel filter OK.
- The battery voltage at least 12.5 V.
- All electrical consumers switched off (radiator fan must NOT run during test).
- A/C switched off.
- The fuel tank at least 1 / 4 filled.
- The ignition switched off.

Procedure







- Remove the rear engine cover - arrows -.

Checking voltage
- Disconnect the Low Fuel Pressure Sensor G410 connector.
- Switch the ignition on.







- Using a multimeter, check the Low Fuel Pressure Sensor G410 electrical harness connector for voltage.

Low Fuel Pressure Sensor Specified
G410 electrical harness value
connector terminals
1 to Battery positive (+) Battery voltage (+)
2 to Ground (GND) about 5 V
3 to Ground (GND) about 5 V

- Switch the ignition off.

If the specified values are obtained:
- Replace the Low Fuel Pressure Sensor G410.

If the specified values are not obtained:

Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Engine Control Module (ECM) J623.







- Using a Multimeter, check the Low Fuel Pressure Sensor G410 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector T94 terminals for an open circuit.

Low Fuel Pressure Sensor Engine Control Module
G410 electrical harness (ECM) J623 electrical
connector terminals connector T94 terminals or test box socket
1 53
2 38
3 19

Specified value: 1.5 Ohms Max.

If the specified value was not obtained:
- Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the voltage supply was not OK:
- Replace the Engine Control Module (ECM) J623.







- Install the rear engine cover - arrows -.

Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

- End of diagnosis.