Symptom:
P0116-ENGINE COOLANT TEMPERATURE PERFORMANCE
When Monitored and Set Condition:
P0116-ENGINE COOLANT TEMPERATURE PERFORMANCE
When Monitored: Engine off time is greater than 480 minutes. Ambient temperature is
greater than -23°C (-9°F).
Set Condition: After a calibrated amount of cool down time, the PCM compares the ECT
Sensor, IAT Sensor and the Ambient Air Temperature Sensor values. If the ECT Sensor
value is not within calibrated temperature amount of the other two temperature sensors
an error is detected. Two Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
(K2) ECT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
ECT SENSOR VOLTAGE BELOW 0.1 VOLT
(K2) ECT SIGNAL CIRCUIT OPEN
(K167) SENSOR GROUND CIRCUIT OPEN
(K2) ECT SIGNAL CIRCUIT SHORTED TO GROUND
(K2) ECT SIGNAL SHORTED TO (K167) SENSOR GROUND
PCM HIGH
PCM LOW
TEST ACTION APPLICABILITY
1 NOTE: The PCM compares IAT,AAT and ECT to determine if they are within
a calibrated temp of one another. Using a block heater that does not meet
OEM specifications or that is not installed at the proper location can defeat
the algorithm in the PCM.
Ignition on, engine not running.
NOTE: Check with the customer to determine if such a block heater is
installed on the vehicle.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
68
DRIVEABILITY - NGC
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