2193-O2 Sensor 1/1 Circuit/Open: Notes

Fig 1: Oxygen Sensor Circuit Schematic

Courtesy of CHRYSLER LLC

For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS article.

The PCM monitors the exhaust gases for oxygen content and varies the rich/lean fuel mixture of the intake air fuel mixture to adjust the system. This diagnostic monitors the upstream O2 sensor circuit. The PCM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The PCM will turn off the MIL lamp diagnostic runs and passes in four consecutive drive cycles.

When Monitored:
This diagnostic runs when the engine is running.
Set Condition:
The PCM will illuminate the MIL lamp immediately when the diagnostic runs and fails.

Possible Causes
O2 1/1 HEATER CONTROL SUPPLY CIRCUIT OPEN
O2 1/1 HEATER CONTROL RETURN CIRCUIT OPEN
O2 1/1 PUMP CURRENT CIRCUIT OPEN
O2 1/1 RETURN CIRCUIT OPEN
O2 1/1 PUMP CELL CURRENT TRIM CIRCUIT OPEN
O2 1/1 SIGNAL CIRCUIT OPEN
PCM

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.