Signal Too High

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

Diagnostic Trouble Code (DTC) status ECM-2000 Engine Coolant Temperature (ECT) sensor. Signal too high
Reading Diagnostic Trouble Code (DTC) status ECM-2000



Note! When Reading the Diagnostic Trouble Code (DTC) status, other stored Diagnostic Trouble Codes (DTCs) and their status will be listed.

- Read the Diagnostic Trouble Code (DTC) status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent?
Yes - Continue below.
No - Signal Too High - Intermittent Fault


Checking connector



- Ignition off
- Check Engine Coolant Temperature (ECT) sensor connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- To access/replace the engine coolant temperature (ECT) sensor, Thermostat/Temperature Sensor, Engine Coolant,Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Checking connector



- Ignition off
- Reinstall components, reconnect connectors etc.
- Ignition on.
- Read Engine Coolant Temperature (ECT) sensor signal.

Check that the signal is within bounds, compare with table values: Engine Coolant Temperature (ECT) Sensor
If the temperature is now OK it means that the fault was caused by loose connections in the connector.

Other information
- To access/replace the engine coolant temperature (ECT) sensor, Thermostat/Temperature Sensor, Engine Coolant,Replacing
- For information about signals, Pinout Values and Diagnostic Parameters

Is the temperature reading OK?
Yes - Skip to "Verification"
No - Continue below.


Checking wiring and components



Check Engine Coolant Temperature (ECT) sensor resistance. For resistance values, Engine Coolant Temperature (ECT) Sensor

Check signal lead between control module # A40 (# A40) and Engine Coolant Temperature (ECT) sensor connector terminal 1 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault and a short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault

Hint: With the ignition on and Engine Coolant Temperature (ECT) sensor connector disconnected the voltage between terminal 1 and ground terminal should be approximately 5V.

Check ground lead between control module # A61 (# B3) and Engine Coolant Temperature (ECT) sensor connector terminal 2 for an open-circuit according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the engine coolant temperature (ECT) sensor, Thermostat/Temperature Sensor, Engine Coolant,Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components.
- Start the engine and let it idle.
- Read Engine Coolant Temperature (ECT) sensor signal. Compare the Engine Coolant Temperature (ECT) sensor signal to the table value. Engine Coolant Temperature (ECT) Sensor

Let the engine run at idling speed, check that the signal sinks when the engine warms up.

Is the engine coolant temperature (ECT) sensor signal OK?
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.