Neon L4-2.0L VIN C (1997)
Oxygen Sensor: Description and Operation
CIRCUIT OPERATION
Circuit A14 is a bus bar in the Power Distribution Center (PDC), and connects to battery voltage. The contact side of the Automatic Shut Down
(ASD) relay connects circuit A14 and circuit A142. A 20 Amp fuse in the PDC protects circuits A14 and A142.
Circuit A14 also supplies voltage to the coil side of the ASD relay. The Powertrain Control Module (PCM) controls the ground path circuit for the
coil side of the ASD relay on circuit K51. Circuit K51 connects to cavity 67 of the PCM connector.
Circuit A142 splices to supply voltage for the upstream and downstream heated oxygen sensors.
The A142 circuit also splices to cavity 6 of the PCM. The input provided by circuit A142 at cavity 6 tells the PCM that the ASD relay energized.
Circuit K41 delivers the signal from the upstream heated oxygen sensor to the PCM. Circuit K41 connects to cavity 30 of the PCM connector.
Circuit K141 delivers the signal from the down-stream heated oxygen sensor to the PCM. Circuit K141 connects to cavity 51 of the PCM
connector.
The PCM provides a ground for the upstream and downstream heated oxygen sensor signals (circuit K41 and K141) through circuit K4. Circuit
K4 connects to cavity 43 of the PCM connector
Circuit Z1 provides ground for the heater circuits in each sensor. Circuit Z1 terminates at the left side of the radiator closure panel.
