Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking 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) low-speed signal may be stored. After fault-tracing the connector must be reconnected.








- Ignition off
- Check the engine coolant temperature (ECT) sensor connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Reinstall components, reconnect 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 Engine temperature sensor Engine Temperature Sensor.













Is the temperature within its permitted range?

Yes - FAULT FOUND

No - Checking wiring and components

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

Checking wiring and components
Check engine coolant temperature (ECT) sensor resistance.

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 #A4 (#A4) engine coolant temperature (ECT) sensor #1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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

Check ground lead between control module #A60 (#A60) and engine coolant temperature (ECT) sensor #2 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- To access the engine coolant temperature (ECT) sensor, see Engine temperature sensor Engine Temperature Sensor.
- For resistance values, see Component specifications [1][2]Engine Control Module.
- For information about signals, see Signal specification Signal Specifications.














Continue - Verification

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

Verification




Verification

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








- Ignition off
- Reconnect 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

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

VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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

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 - Checking connector

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