Circuit Description
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
PCM and Throttle Actuator Control (TAC) module communicate through a dedicated serial data circuit. This diagnostic monitors accuracy of serial data transmission between PCM and TAC module. If a loss of data or invalid data is detected, this DTC will set.
Conditions for setting this DTC are, invalid or missing serial data messages are detected for a predetermined amount of time and condition is present for less than one second.