Faulty Signal

Faulty signal

Information
The diagnostic trouble code (DTC) may for example be stored when:
- Insufficient coolant in cooling system.
- Clogged radiator.
These should therefore be checked and rectified first.





Continue - Checking the function

-------------------------------------------------

Checking the function




- Ignition on.
Activate the engine cooling fan (FC). Check that it starts and runs normally.
Try by activating different speeds on the electric cooling fan.
Remedy as necessary.

Other information









Continue - Checking the component and wiring

-------------------------------------------------

Verification




Verification

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








- Verification should begin with a cold engine (+20 °C) so that the engine coolant temperature (ECT) sensor can be tested over as wide a temperature range as possible
- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine.
Read off the engine coolant temperature (ECT) sensor signal.
Check that the engine coolant temperature (ECT) is within its permitted range and corresponds with the engine warming up.





Is the temperature within its permitted range?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

-------------------------------------------------

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

------------------------

Attempt New Test - Information

-------------------------------------------------

Checking the component and wiring








- Ignition off.
- Unplug the engine temperature sensor connectors.
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, Engine Control Module (ECM)
- Component specifications, B5254T7 Specifications
- Engine coolant temperature sensor (ECT), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Continue - Verification

-------------------------------------------------