Fault-Tracing Information

Fault-tracing

Checking the status




Check whether the fault is permanent or intermittent by reading the signals from the fuel, outside and engine temperature sensors.

Note! In order for the correct values to be shown, reading of the temperatures must take place at the moment of start.

- Start the engine.
Check that the fuel temperature is within its permitted range. The fuel temperature should not be lower than the outdoor temperature and a maximum of 40 °C above the engine temperature.
The fault is permanent if the signal is incorrect. The fault is intermittent if the signal is correct.

Hint: Remove the fuel temperature sensor, but let the connector remain connected. The fuel temperature sensor is integrated in the fuel pressure sensor. The sensor should then show the same temperature as the outdoor temperature.









Continue - Checking the component and wiring

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Checking the component and wiring








- Ignition off.
- Disconnect the fuel temperature sensor connector.
- Check the connectors. Check for loose connections. Check for contact resistance. Check for oxidation.
Check the resistance of the sensor between #1 and #2 (to the sensor).
Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Pressure sensor, fuel rail (FRP), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Ignition on.
Read off the fuel temperature sensor signal. Check that the signal is within its permitted range.





Is the value OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing information

Attempt New Test - Checking the status

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