Signal Too Low

Signal too low

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. A diagnostic trouble code (DTC) for the engine cooling fan (FC) control module may be stored. After fault-tracing the connector must be reconnected.








- Ignition off
- Check the connector on the engine coolant temperature (ECT) sensor. 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 poor contact in the connector.

Other information
- 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




- Ignition off.
Check the resistance of the engine coolant temperature (ECT) sensor between terminals #1 and #2 (component side).

Note! The engine coolant temperature (ECT) sensor may be damaged if there has been a short-circuit to supply voltage in the signal cable. Check this before replacing the sensor.

Check the signal cable between engine control module (ECM) 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 should 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.
If no faults are found and the fault is permanent, replace the engine coolant temperature (ECT) sensor.
Remedy as necessary.

Other information
- Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- Signal specification Signal Description / Specification
- Component specifications Specifications
- Temperature sensor engine coolant, replacing Service and Repair
- 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 - 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 - Checking the connector

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