Circuit Description

SERVICE THROTTLE SOON indicator light is illuminated by PCM if diagnostics have detected certain errors related to Accelerator Pedal Position (APP) sensor. Illumination is accomplished by PCM providing a ground path for light circuit.

DTC will set when the following conditions are present:

SERVICE THROTTLE SOON indicator light is requested on.
No voltage drop on SERVICE THROTTLE SOON indicator light control circuit.
Two consecutive faults detected.
Conditions are met for 2 seconds.

SERVICE THROTTLE SOON indicator light is requested off.
No ignition voltage on SERVICE THROTTLE SOON indicator light control circuit.
Two consecutive faults detected.
Conditions are met for 2 seconds.