Signal Too Low

Signal too low

Checking the status




- Start the engine and run it to normal operating temperature.
Check whether the fault is permanent or intermittent. Read off the signal from the fuel temperature sensor.
Check that the signal is within its permitted range. The signal is measured in the fuel rail for the injectors.
The fault is permanent if the signal is incorrect. The fault is intermittent if the signal is correct.










Continue - Checking the component and wiring

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Checking the component and wiring

Hint: The fuel temperature sensor is integrated in the fuel pressure sensor.

- Check the fuel pressure sensor connectors. Check for contact resistance and oxidation.
Check the fuel pressure sensor between terminals #1 and #2 (sensor side). Check the resistance.
Check the signal cable between engine control module (ECM) terminal #A66 (#B6) and fuel pressure sensor terminal #2. Check for a short-circuit to supply voltage. Check for an open-circuit.
Check the ground lead between engine control module (ECM) terminal #A15 (#A15) and fuel pressure sensor terminal #1. Check for an open-circuit.
Remedy as necessary.

Other information:
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- Component specifications [1][2]Electrical Specifications
- Pressure sensor, fuel rail (FRP) Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals














Continue - Verification

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Verification




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. The signal is measured in the fuel rail for the injectors.





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




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the status

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