RAM 2500 Truck 4WD V8-5.9L VIN Z (1997)
Oxygen Sensor: Description and Operation
Heavy Duty
When the Automatic Shut Down (ASD) relay contacts CLOSE, they connect circuits A16 and K125. Circuit K125 splices to supply voltage to the heated
oxygen sensors.
Circuit K41 delivers the signal from the upstream heated oxygen sensor to the PCM. Circuit K41 connects to cavity A24 of the PCM. Circuit K241
delivers the signal from the downstream sensor and connects to cavity A26 of the PCM.
The PCM provides a ground for the heated oxygen sensor signals (circuits K41 and K241) through circuit K4. Circuit K4 connects to cavity A4 of the
PCM connector.
Circuit Z11 provides a ground for the heater circuit in the sensors.
