Ford Aerostar 1986-1997 Repair Guide

Air Charge Temperature Sensor



See Figure 1

The air charge temperature sensor provides the electronic fuel injection system with air/fuel mixture information. This sensor is used as both a density corrector to calculate air flow and to proportion cold enrichment fuel flow. This sensor is similar in construction to the engine coolant temperature sensor.

Click image to see an enlarged view

Fig. Fig. 1: Air charge temperature sensor


To test the air charge temperature sensor requires the use of expensive specialized equipment. If you suspect a faulty or defective sensor, consult an authorized mechanic whose has access to this equipment.


When the battery cable has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module relearns its adaptive strategy. The vehicle may need to be driven 10 miles (16 km) or more to relearn the adaptive strategy.

This sensor is located in the engine cylinder runner of the intake manifold.

  1. Disconnect the negative battery cable.
  3. Unfasten the wire harness attached to the charge sensor.
  5. Using a suitable wrench or equivalent, remove the sensor from the manifold or cylinder runner. Remove the washer from the sensor and discard.

To install:
  1. Install the sensor, using a new washer into the hole in the cylinder runner or intake manifold. Tighten the sensor to 15-18 ft. lbs. (19-23 Nm).
  3. Fasten the wire harness to the rear of the charge sensor.
  5. Connect the negative battery cable.