Signal Too High - Intermittent Fault

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

Checking wiring and connectors



Check signal cable between control module #A40 and Engine Coolant Temperature (ECT) sensor terminal 1 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults and an short-circuit to intermittent supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

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 and Engine Coolant Temperature (ECT) sensor connector terminal 2 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

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


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.