Circuit Description
WARNING: This page is about a different car, the 1998 Pontiac Trans Sport, 1998 Oldsmobile Silhouette, and 1998 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Output Driver Modules (ODMs) are used by Powertrain Control Module (PCM) to turn on current driven devices that are needed to control various engine and transaxle functions. Each ODM can control up to 7 separate outputs by grounding the device that PCM is commanding on. ODMs can diagnose each output circuit individually. DTC P1641 indicates an improper voltage level has been detected on the output circuit controlling the A/C compressor control relay.
Conditions for setting this DTC:
- Ignition is on.
- Improper voltage level detected on output circuit controlling A/C control relay.
- Conditions present for at least 30 seconds.