Cirrus V6-2.5L VIN H (1995)
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.
Circuit A142 splices to supply voltage to the upstream and downstream heated oxygen sensors.
The A142 circuit also splices to cavity 6 of the PCM connector. The input by circuit A142 tells the PCM that the ASD relay is energized.
Circuit K41 (K141 2.5L) delivers the signal from the upstream heated oxygen sensor to the PCM. Circuit K41 (K141) connects to cavity 30 of the
PCM connector.
Circuit K141 connects to cavity 29 of the PCM connector.
The PCM provides a ground for the upstream and downstream heated oxygen sensor signals (circuits K41 and K141) through circuit K4. Circuit
K4 connects to cavity 43 of the PCM connector.
Circuit Z1 provides the ground path for the heater circuits in the sensors. This ground terminates at the right frame rail.
NAME OF CODE: O2S Stays Above Center (Rich)
When Monitored:
With the engine running in closed loop and the coolant temperature above 170°F.
Set Condition:
The oxygen sensor signal voltage stays between 0.5 and 1.2 volts without toggling for at least 8 minutes.
Possible Causes:
-
High fuel pressure
-
Other engine sensor calibrations
-
Ignition system failure
-
O2 sensor failure
-
Mechanical engine problem
NAME OF CODE: O2S Stays Below Center (Lean)
When Monitored:
With the engine running in closed loop and the coolant temperature above 170°F.
Set Condition:
The oxygen sensor signal voltage stays below 0.5 without toggling for at least 8 minutes.
Possible Causes:
-
Low fuel pressure
-
Vacuum Leak
-
Other engine sensor calibrations
-
Ignition system failure
-
O2 sensor failure
-
Mechanical engine problem
NAME OF CODE: Upstream O2S Shorted To Voltage
When Monitored:
With the ignition key ON.
Set Condition:
The upstream oxygen sensor signal voltage is above 1.2 volts for 3 seconds.
Possible Causes:
-
Sensor output wire shorted to another circuit
-
Dirty/wet connection causing voltage tracking in connector
-
O2 sensor failure
-
PCM failure
-
Connector terminals
-
Connector wires
NAME OF CODE: Upstream O2S Stays at Center
