Checking the Fuel Pressure and Residual Pressure in the Workshop

Checking the fuel pressure and residual pressure in the workshop

Choosing a method for taking a reading

Note! For vehicles with demand activated fuel pumps (FP), see VIDA vehicle communication Quick test of fuel pump (FP).

The fuel pressure can be measured with the car stationary or while being driven. Residual pressure is measured with the car stationary.
When the car is being driven, see Taking fuel pressure readings while driving the car Taking Fuel Pressure Readings While Driving the Car.


Continue - Measuring the line pressure

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Measuring the line pressure
- Connect the pressure gauge according to Fuel pressure gauge Fuel Pressure Gauge
- Remove the soundproofing panel
- Remove the fuel pump (FP) relay (CMI 12 in the passenger compartment)
- Connect a cable to the relay base as illustrated.
Read off the line pressure from the pressure gauge. The line pressure must be 375-395 kPa
Check the residual pressure if the fuel pressure is OK.
Remedy as necessary

Other information
- For the location of and to replace the fuel pump (FP) relay, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- For the location of and to replace the fuel pump (FP), see Right side fuel pump with level sensor Right Side Fuel Pump With Level Sensor
- Replacing the fuel filter Service and Repair
- To disconnect the pressure gauge, see Fuel pressure gauge Fuel Pressure Gauge.





Is the rest pressure to be checked?

Yes - Checking the residual pressure

No - DONE

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Checking the residual pressure
- Switch off the ignition
- Disconnect the cable between the terminals on the relay base
- Reinstall the fuel pump (FP) relay.
The line pressure must not fall below 200 kPa within 20 minutes of the fuel pump (FP) being shut-off.
Remedy as necessary

Other information
- Injector/pulse damper, replacement Service and Repair
- For the location of and to replace the fuel pump (FP) relay, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- For the location of and to replace the fuel pump (FP), see Right side fuel pump with level sensor Right Side Fuel Pump With Level Sensor
- To disconnect the pressure gauge, see Fuel pressure gauge Fuel Pressure Gauge.






Continue - DONE

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