Oxygen Sensor: Testing and Inspection

Circuit A142 splices to supply voltage to the fuel injectors, ignition coil, ASD relay, generator, and the Powertrain control Module (PCM). The PCM controls the ground path for each of the components powered by circuit A142.

Circuit K4 splices to supply ground for the signals for the following:
- Intake air temperature sensor
- Engine coolant temperature sensor
- Manifold absolute pressure sensor
- Throttle position sensor
- Camshaft position sensor
- Crankshaft position sensor
- Vehicle speed sensor