Code P037, Shorted Intake Air Temperature (IAT) Sensor: Action
WARNING: This page is about a different car, the 1995 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
PCM turns on MIL. PCM substitutes outside air temperature for IAT. Transaxle shift adapts are maintained at current levels.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- With a shorted IAT sensor, PCM parameter PD05 should indicate 148°C or greater. If PD05 does not indicate 148°C or greater, sensor is not shorted.
- Checks for sensor short or circuit No. 472 shorted to ground. If PCM parameter PDO5 stays at 147-151°C with sensor unplugged, circuit is shorted to ground.
- Checks shorted sensor or circuit No. 472 shorted to ground inside intake manifold. If PCM data PD05 stays at 147-151°C with sensor unplugged, circuit No. 472 is sorted to ground.
- IAT sensors can be damaged by a backfire in intake. If vehicle has had more than one IAT sensor replaced, check for signs of backfire and high intake manifold temperatures due to improper valve train operation.