Faulty Signal

Faulty signal

Diagnostic trouble code (DTC) status ECM-200F Engine coolant temperature (ECT) sensor. Faulty signal

Note! When reading off the diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.

Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).





Was the status of the relevant diagnostic trouble code (DTC) permanent?

Yes - Checking the engine coolant temperature (ECT)

No - Checking wiring and connectors

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Checking wiring and connectors
Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation. Check for loose connections.

Other information
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the control module, see Engine control module (ECM), replacing Service and Repair
- To access the engine coolant temperature (ECT) sensor, see Engine coolant temperature (ECT) sensor, replacing Service and Repair
- For information about signals see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.










Continue - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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Attempt New Test - Diagnostic trouble code (DTC) status ECM-200F Engine coolant temperature (ECT) sensor. Faulty signal

FAULT FOUND - DONE

DONE - DONE

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Checking the engine coolant temperature (ECT)




- Fault-tracing must begin with the engine cold (+20°C) so that the engine coolant temperature (ECT) sensor can be tested over as wide a temperature range as possible
- Switch off the climate control system
- Start the engine.
Read off the engine coolant temperature (ECT).
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 - Checking the thermostat

No - Replacing component

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Checking the thermostat




- Start the engine. Run the engine until the engine coolant temperature (ECT) reaches approximately 100°C
- Activate the engine cooling fan (FC) with the engine running
- Wait approximately 90 seconds and then shut-off the engine cooling fan (FC).
Read off the engine coolant temperature (ECT). If it is 85°C or lower when the fan stops, the thermostat is defective.




°
Is the engine coolant temperature (ECT) 85C or lower?

Yes - Replacing component

No - Fault-tracing information

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Replacing component
Try a new engine coolant temperature (ECT) sensor.

Other information
- To access or replace the engine coolant temperature (ECT) sensor, see Engine coolant temperature (ECT) sensor, replacing Service and Repair.


Continue - Verification

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Replacing component
Try a new thermostat.

Other information
- To access or replace the thermostat see Engine coolant temperature (ECT) sensor, replacing Service and Repair.


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 connectors, reinstall components
- Verification must begin with cold engine (+20°C (68°F)) so that the engine coolant temperature (ECT) sensor can be tested over as wide a temperature range as possible.
- Turn off climate control.
- Start the engine.
Read off engine coolant temperature (ECT).
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 - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Diagnostic trouble code (DTC) status ECM-200F Engine coolant temperature (ECT) sensor. Faulty signal

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