Pcm Code E015, Open Coolant Sensor Circuit: Action

PCM turns on SERVICE ENGINE SOON light and uses MAT sensor value instead of coolant sensor value for all calculations for first 4 minutes of operation. After 4 minutes, PCM uses a value of 194°F (90°C).

1. If sensor is open, PCM parameter ED04 should indicate -38°C or less. If ED04 does not indicate -38°C or less, sensor signal is not open. See NOTE ON INTERMITTENTS.
2. This checks for open sensor signal in circuit No. 410 from PCM to sensor connector. If parameter ED04 indicates 148-151°C with connector shorted, circuit No. 410 is okay.
3. This checks for open in sensor ground (circuit No. 1076 from sensor terminal "A" to ground splice). If shorting terminal "A" to ground causes parameter ED04 to indicate 148-151°C, an open in circuit No. 1076 exists.
4. This checks if PCM can recognize a short to ground or low voltage on terminal E16, coolant temperature signal. If grounding terminal E16 causes ED04 to indicate 148-151°C, open circuit exists in circuit No. 410 from PCM to coolant sensor.
5. Fault is most likely at PCM connector or PCM.