Fuel Pressure Sensor, Checking
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
Special tools and workshop equipment required
- multimeter
- Wiring diagram.
Test requirements
- The Fuel Pump (FP) Control Module -J538- OK.
- 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 with air filter -1-. Refer to appropriate service manual.
Checking voltage
-- Disconnect the Fuel Pressure Sensor -G247- electrical harness connector.
-- Switch the ignition on.
-- Using a multimeter, check the Fuel Pressure Sensor -G247- electrical harness connector terminals for voltage.
| Fuel Pressure Sensor -G247- electrical harness connector terminals | Specified value |
|---|---|
| 1 to Battery positive (+) | Battery voltage |
| 3 to Ground (GND) | about 5 V |
-- Switch the ignition off.
If the specified value was obtained:
-- Replace the Fuel Pressure Sensor -G247-. Refer to appropriate service manual.
If the specified value was not obtained:
Checking wiring connections
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 Motronic Engine Control Module (ECM) -J623-. Refer to appropriate service manual.
-- 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 according to the wiring diagram.
| Fuel Pressure Sensor -G247- electrical harness connector terminals | Motronic Engine Control Module (ECM) -J623- electrical connector T60 terminals or test box socket |
|---|---|
| 1 | 14 |
| 2 | 25 |
| 3 | 26 |
Specified value: 1.5 Ω Max.
If the specification is not obtained:
-- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to appropriate service manual.
-- Install the engine cover with air filter. Refer to appropriate service manual.
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 .