Circuit Description

Accelerator Position Sensor (APS) circuit provides a voltage signal relative to accelerator pedal angle. APS1 angle will vary from about 13 percent at idle position to about 87 percent at wide open throttle. DTC P1290 detects if system is in Electric Throttle Control (ETC) Forced Idle Mode (Fail Safe Mode).

PCM will store conditions present when DTC was set as freeze frame data and in the FAILURE RECORDS data.

PCM will turn MIL off on third consecutive trip cycle during which diagnostic runs and fault is no longer recognized. A history DTC will clear after 40 consecutive trip cycles during which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.