Fuel Pressure Sensor, Checking
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
See Appropriate Wiring Diagram Information for component locations and connector views.
Special Tools And Workshop Equipment Required
- Multimeter.
- Wiring diagram.
Test Requirements
- The Motronic 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.
Test Procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start Diagnosis
-- Remove the engine cover.
Checking Voltage
-- Disconnect the Fuel Pressure Sensor -G247- electrical harness connector.
-- Switch the ignition On.
-- Using a multimeter, check the Fuel Pressure Sensor -G247- view electrical harness connector terminals for voltage.
| Fuel Pressure Sensor -G247- electrical harness connector terminals | Specified value |
|---|---|
| 1 to Battery Positive | Battery Voltage |
| 2 to Ground | 4.6 - 5 Volts |
| 3 to Ground | 5 Volts |
-- Switch the ignition Off.
If The Specified Value Was Obtained:
-- Replace the Fuel Pressure Sensor -G247- : Refer to the Repair information.
If the specified value was Not obtained:
Checking Wiring
-- Remove the Motronic Engine Control Module (ECM) -J623-.
-- Using a multimeter, check the Fuel Pressure Sensor -G247- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit. Refer to Appropriate Wiring Diagrams for Pin locations.
| Fuel Pressure Sensor -G247- electrical harness connector terminals | Motronic Engine Control Module (ECM) -J623- electrical connector T60 terminals |
|---|---|
| 1 | 53 |
| 2 | 40 |
| 3 | 25 |
Specified Value: 1.5 Ω Max.
If The Specified Value Was Not Obtained:
-- Check the wiring for an open, high resistance or short to ground.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If The Specified Value Was Obtained:
-- Replace the Motronic Engine Control Module (ECM) -J623-.
-- Install the engine cover.
Final Procedures
After the 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 .