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 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 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
- To connect the breakout box / access the control module, see connecting the breakout box
- To access the engine coolant temperature (ECT) sensor, see Temperature sensor engine coolant, replacing
- For resistance values, see component specifications
- For information about signals, see ELECTRICAL SYSTEM
- See Contents .
- Continue
Refer to Verification