P014

Diagnostic Trouble Code Chart P014:

PCM Circuit:

CIRCUIT DESCRIPTION
The Engine Coolant Temperature (ECT) sensor is a thermistor, a sensor whose resistance varies with temperature. The ECT sensor signal is on CKT 410 and sensor ground on CKT 808. As the temperature of the sensor increases, resistance decreases. A high coolant temperature will result in low signal voltage on CKT 410. Code P014 sets because the coolant temperature cannot be greater than 147°C (297°F) when the Intake Air Temperature (IAT) is less than 100°C (212°F).

TEST CONDITIONS
1. Codes P037 and P038 not set.
2. IAT temperature of 100°C (212°F) or less.

FAILURE CONDITION
Engine Coolant Temperature Sensor signal 147°C (297°F) or greater for 2 seconds.

ACTION TAKEN
1. Powertrain Control Module (PCM) turns "ON" the Malfunction Indicator Lamp (MIL) (Service Engine Soon).
2. PCM uses the IAT sensor values in place of the engine coolant temperature sensor for the first 4.25 minutes of engine operation, and a value of 90°C (194°F) afterwards.
3. Transaxle shift adapts are maintained at current levels.

NOTES ON FAULT TREE
1. With the ECT sensor or wiring shorted, PCM Data parameter PD04 will read 147°C (297°F) or greater.
2. Checking for sensor shorted or CKT 410 shorted. If the parameter value stays at 147°C (297°F) or greater with the sensor unplugged, the short is in CKT 410 between sensor pin "B" and PCM terminal "1B5."
3. Checking for faulty mating of PCM connector. Fault is most likely at the PCM connector.