Pcm Code P015 - Open Coolant Sensor Signal: Action

PCM turns on SERVICE ENGINE SOON light and uses IAT sensor value instead of coolant sensor value for all calculations during first 10 minutes of operation. After 10 minutes, PCM uses a value of 194°F (90°C).

1. If sensor or wiring is open, parameter PD04 should indicate -38°C or less. If PD04 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 PD04 indicates 148-151°C with connector shorted, circuits No. 410 and 1076 are okay.
3. Checks for open in circuit No. 1076 from sensor terminal "B". If shorting terminal "B" to ground causes parameter PD04 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 3E16, coolant temperature signal. If grounding terminal 3E16 causes PD04 to indicate 148-151°C, circuit No. 410 from PCM to coolant sensor is open.
5. Fault is most likely at PCM connector or PCM.