Faulty Signal

Faulty signal

Checking the fuel pump unit and the fuel pressure sensor

Note! The vehicle should be switched off, ignition off, for at least 5 minutes before starting fault-tracing.




- Ignition on
- Check that the power supply to fuel pressure sensor terminal #4 is approximately 5 V
- Start reading off parameters
- Check that the pressure is lower than 380±5 kPa
- Start the car
- At idle speed:
- Check that the pressure has risen to 380±5 kPa.
- Check that battery voltage is normal, that is above 12 V.
- Check the pressure and the pump work load:
If the pump work load is high (>75%), check the fuel pump unit.
Check the fuel pump unit if the pressure is extremely high (>500 kPa) at the same time as the pump work load is low (>15%).
Check the pressure sensor if the pressure is not constant at 380±5 kPa.
Check the connectors for the engine control module (ECM), fuel pump unit and fuel pressure sensor. Check for contact resistance and oxidation.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- For information about signals, see Signal specification Signal Description / Specification
- To access and replace the fuel pressure sensor, see Fuel pressure sensor, replacement Service and Repair
- To access / replace the fuel pump unit, see Level sensor, fuel tank, right-hand/fuel tank, replacing Level Sensor, Fuel Tank/Fuel Pump, Replacement
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Information

Fault-tracing information
In case of this defect, troubleshooting is not followed by verification.
The information can be displayed again or the fault-tracing for this fault can be interrupted.

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Yes - Attempt New Test

No - Fault Found

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Attempt New Test - Checking the fuel pump unit and the fuel pressure sensor

FAULT FOUND - Fault Found

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