Signal Too High - Permanent Fault

ECM-2000 ENGINE COOLANT TEMPERATURE (ECT) SENSOR
SIGNAL TOO HIGH - PERMANENT FAULT

Checking wiring and components




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.

Check engine coolant temperature (ECT) sensor resistance. Check signal cable between control module #A4 (#A4) and engine coolant temperature (ECT) sensor #1 for a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- Connecting the breakout box/accessing the control module, Connecting the Breakout Box (ECM)
- To access the engine coolant temperature (ECT) sensor, Engine Temperature Sensor, Replacing
- For resistance values, see Component Specifications. Specifications
- For information about signals, see Diagnostic Parameters and Pinout Values. Signal Description, ME7, B5XX4T


Verification




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

- Ignition off.
- Reconnect connectors, reinstall components
- Ignition on.
- Read off the engine coolant temperature (ECT) sensor.

Is the temperature within its permitted range?
Yes - Testing Complete.
No - Continue below.


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.