Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the connector

Warning! Before fault-tracing can begin, the engine cooling fan (FC) connector must be disconnected to prevent the engine cooling fan (FC) engaging. Diagnostic trouble code (DTC) ECM-6110 Engine cooling fan (FC) control module may be stored. After fault-tracing the connector must be reconnected.








- Ignition off
- Check the engine coolant temperature (ECT) sensor connector. Check for contact resistance and oxidation
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the engine coolant temperature (ECT) sensor.
If the temperature is now within its permitted range, the fault was caused by loose connections in the connector.

Other information
- To access the engine coolant temperature (ECT) sensor, see Temperature sensor engine coolant, replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals.













Is the temperature within its permitted range?

Yes - FAULT FOUND

No - Checking the wiring and component

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Checking the wiring and component
Check the resistance of the engine coolant temperature (ECT) sensor.

Note! The engine coolant temperature (ECT) sensor may be defective as a result of the signal cable having been short-circuited to supply voltage. Check this before replacing the sensor.

Check the signal cable between control module terminal #A4 (#A4) and engine coolant temperature (ECT) sensor terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage.

Hint: With the ignition on and engine coolant temperature (ECT) sensor connector disconnected the voltage between terminal #1 and ground terminal must be approximately 5 V.

Check the ground lead between control module terminal #A60 (#A60) and engine coolant temperature (ECT) sensor terminal #2. Check for an open-circuit.
Remedy as necessary.

Other information
- To connect the breakout box / access the control module, see Connecting the breakout box, B5254T2 Connecting the Test Box
- To access the engine coolant temperature (ECT) sensor, see Temperature sensor engine coolant, replacing Service and Repair
- For resistance values, see Component specifications Specifications
- For information about signals, see Signal specification Signal Specification
- 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 engine coolant temperature (ECT) sensor.





Is the temperature within its permitted range?

Yes - Verification completed

No - Fault-tracing information

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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 connector

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