Neon L4-2.0L VIN C (1997)
Malfunction Indicator Lamp: Description and Operation
CIRCUIT OPERATION
The Service Engine Soon lamp illuminates when the ignition switch is in the ON position and prior to starting the vehicle. The lamp will turn off
after the vehicle is started.
If while the vehicle is running a problem is detected in the engine control system the lamp is illuminated. This is accomplished by the Powertrain
Control Module (PCM) grounding the G3 circuit.
