Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
ECM receives the operating condition of A/C system from the A/C Electronic Control Unit (ECU) and electrical load information from the body Electronic Control Unit (ECU) over the bus communications system. ECM uses this information to control engine idle speed. Possible causes are:
- Defective body ECU.
- Bus communications circuit is open or shorted.
- Defective ECM.