Circuit Description

ECM receives the operating condition of A/C system from the instrument cluster. ECM also receives electrical load information from the body ECM over the bus communications system from the instrument cluster. ECM uses this information to control engine idle speed. Possible causes are:

• Defective ABS ECU.
• Defective air bag sensor assembly.
• Defective instrument cluster.
• Defective A/C ECU.
• Bus communications circuit is open or shorted.
• Defective ECM.