O2 Sensor Circuit
Diagnostic conditions
- Exhaust temperature between 250°C and 750°C
- Battery positive voltage between 10 V and 16 V
- Time elapsed after engine start-up greater than 200 seconds
- No secondary air
- No diagnosis of secondary air system
- No fuel tank ventilation
- No diagnosis of fuel tank ventilation system
- No other oxygen sensor faults
Possible cause of fault
- Short circuit to ground in signal wire
- Intercore short circuit
Affected terminals
DME control module connector II, pin 11 and oxygen sensor jack, bank 1, pin 3
DME control module connector II, pin 17 and oxygen sensor jack, bank 1, pin 4
Diagnosis/troubleshooting
NOTE:
- Do not use contact spray on the oxygen sensor plug connections as this may cause irreparable damage to the wiring (contamination of the oxygen sensor via the reference air channel).