Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
VCM provides a ground to AIR pump relay. Relay energizes the AIR pump and solenoid. VCM monitors HO2S voltage. If voltages go below calibrated threshold value, VCM interprets this as an indication that AIR system is operational. DTC P1415 sets if VCM determines that HO2S voltage on Bank 1 did not respond as expected during monitoring.