Symptom:
P0117-ENGINE COOLANT TEMPERATURE SENSOR LOW
When Monitored and Set Condition:
P0117-ENGINE COOLANT TEMPERATURE SENSOR LOW
When Monitored: With the ignition on.
Set Condition: The Engine Coolant Temperature (ECT) sensor circuit voltage at the PCM
is less than 0.1 of a volt. One Trip Fault.
POSSIBLE CAUSES
ECT SENSOR VOLTAGE BELOW 0.1 VOLTS
ECT SENSOR INTERNAL FAILURE
(K2) ECT SIGNAL SHORTED TO GROUND
(K2) ECT SIGNAL SHORTED TO (K167) SENSOR GROUND CIRCUIT
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read the ECT Sensor voltage.
Is the voltage below 0.1 volt?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
2 Turn the ignition off.
Disconnect the ECT harness connector.
Ignition on, engine not running.
With the DRBIIIt, read ECT Sensor voltage.
Is the voltage between 4.8 and 5.2 volts?
All
Yes → Replace the ECT Sensor.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
3 Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K2) ECT Signal circuit in the ECT
Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the ground shorted to the (K2) ECT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 4
71
DRIVEABILITY - NGC
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