Chart A-1, No Service Engine Soon Light: Notes
The SERVICE ENGINE SOON (SES) light should illuminate with ignition on and engine off. The ECM controls the SES light and turns it on by providing a ground path through ECM terminal A5.
The SERVICE ENGINE SOON (SES) light should illuminate with ignition on and engine off. The ECM controls the SES light and turns it on by providing a ground path through ECM terminal A5.