Low Fuel Pressure Sensor, Checking
The following procedure requires a test drive. Observe all safety precautions. Refer to SAFETY PRECAUTIONS .
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- Fuel Pump (FP) Control Module -J538- OK; check.
- The fuel filter OK.
- The fuses for the engine electronics OK.
- The parking brake engaged.
- The battery voltage at least 12.5 V.
- The selector lever of automatic transmission in position "P" or "N".
- 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
-- Observe safety precautions. Refer to SAFETY PRECAUTIONS
-- Observe Clean Working Conditions. Refer to CLEAN WORKING CONDITIONS
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Checking voltage
-- Disconnect the electrical harness connector from the Low Fuel Pressure Sensor -G410-.
-- Switch the ignition ON.
-- Using a multimeter, check the electrical harness connector for voltage.
| Harness connector Terminal | Specified value |
|---|---|
| 1 to Battery Positive (+) | Battery voltage |
| 2 to ground | Near 5 V |
| 3 to ground | Near 5 V |
-- Switch the ignition OFF.
If specified value was obtained:
-- Replace the Low Fuel Pressure Sensor -G410-
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 Engine Control Module (ECM) -J623-. Refer to the Repair Information.
| Low Fuel Pressure Sensor -G410- electrical harness connector terminals | Engine Control Module (ECM) -J623- electrical connector T60 or T94 terminals |
|---|---|
| 1 | 14 (T60) |
| 2 | 15 (T94) |
| 3 | 37 (T60) |
Specified resistance 1.5 Ω max.
If the specification is Not obtained:
-- Check the wiring for an open, high resistance or short circuit to voltage or ground.
-- If necessary, repair the wiring connection.
If no malfunction is detected in the wiring and the voltage supply was Not OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.
-- Assembly is performed in the reverse of the removal.
Final procedures
After repair work, the following work steps must be performed in the mentioned 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 .