Short-circuit to Ground

Short-circuit to ground

Checking the function of the engine coolant temperature sensor




- Ignition on
- Read off the engine coolant temperature.
Check that the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.





Är temperaturen OK?

Yes - Intermittent fault

No - Checking components and wiring

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Checking components and wiring
Check the resistance of the engine coolant temperature sensor. For the resistance values, see Components resistance values Electronic. Auxiliary Heater.
Check the cable between control module terminal #16 and the signal terminal for the engine coolant temperature (ECT) sensor. Check for a short-circuit to ground. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: It is difficult to separate the ground lead for the engine coolant temperature sensor from the signal cable. Therefore, measure one cable at a time and see if the permitted values are present on either of them.

Remedy as necessary.

Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access or replace the engine coolant temperature sensor, see Overheat protection thermostat / flame sensor / engine coolant temperature sensor, replacing Service and Repair
- With the ignition on and the signal cable for the engine coolant temperature sensor cut, the voltage between the signal cable for the engine coolant temperature sensor (engine control module (ECM) side) and ground should be approximately 5 V
- For other values, see Signal specification Signal Specification.













Välj Fortsätt.

Continue - Verification

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Verification




Verification

Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Connect connector, install components etc.
- Ignition on.
- Read the water temperature.
Check that the coolant temperature is correct. Compare with the actual temperature of the engine.





Is the temperature reasonable?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

PAPER - No 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 - Checking the function of the engine coolant temperature sensor

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Intermittent fault
Check the cable between control module terminal #16 and the signal terminal for the engine coolant temperature sensor. Check for an intermittent short-circuit to ground.
Remedy as necessary.

Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access or replace the engine coolant temperature sensor, see Overheat protection thermostat / flame sensor / engine coolant temperature sensor, replacing Service and Repair
- For other values, see Signal specification Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals.













Välj Fortsätt.

Continue - Fault-tracing information
DONE

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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 - Checking the function of the engine coolant temperature sensor

FAULT-TRACING FAILED - DONE

FAULT FOUND - Fault Found

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