A/C Request Signal

This signal tells the PCM when the A/C mode is selected at the A/C control switch. The PCM uses this input to adjust the idle speed before turning on the A/C clutch. The A/C compressor will be inoperative if this signal is not available to the PCM.

Refer to A/C Clutch Circuit Diagnosis for A/C wiring diagrams and diagnosis for the A/C electrical system.
- Purge/Vacuum Hoses. Made of rubber compounds, these hoses route the gasoline fumes from their sources to the canister and from the canister to the intake air flow.
- EVAP Canister. Mounted on a bracket ahead of the fuel tank, the canister stores fuel vapors until the PCM determines that engine conditions are right for them to be removed and burned.