Lotus Evora - O2 Sensor (Pre Catalyst)

Lotus Service Notes Section EMR
Page 25
O2 Sensor (Pre Catalyst)
P0131 O2 Sensor 1 Circuit Low Voltage (Bank 1)
P0132 O2 Sensor 1 Circuit High Voltage (Bank 1)
P0133 O2 Sensor 1 Circuit Slow Response (Bank 1)
P0134 O2 Sensor 1 Circuit No Activity Detected (Bank 1)
P0135 O2 Sensor 1 Heater Circuit (Bank 1)
P0151 O2 Sensor 1 Circuit Low Voltage (Bank 2)
P0152 O2 Sensor 1 Circuit High Voltage (Bank 2)
P0153 O2 Sensor 1 Circuit Slow Response (Bank 2)
P0154 O2 Sensor 1 Circuit No Activity Detected (Bank 2)
P0155 O2 Sensor 1 Heater Circuit (Bank 2)
Description
The oxygen sensors separately monitor the oxygen content in the exhaust gases of each bank of the engine.
Each sensor is electrically heated to improve response after start.
The sensor consists of a zirconia electrode between two platinum plates. When zirconia comes into contact with
oxygen, it becomes an electrical conductor. The exhaust gases pass through louvers in the sensor. One plate
is in contact with the outside air and the other plate is in contact with the exhaust gases. The platinum plate in
contact with the air is electrically negative due to the oxygen in the atmosphere and the plate in contact with
the exhaust gases is electrically positive. This will cause a difference in electrical potential to develop between
the two plates. Thus the voltage across the platinum plates ranges approximately from 100 millivolts to 900
millivolts, depending on the oxygen content of the exhaust gases. Thus when the air/fuel mixture is rich, the
oxygen sensor output will be high. If the air/fuel mixture is lean, the oxygen sensor output will be low.
Sensor connections
Sensor Connector Description ECU Pin ECU Connector
1 Bank 1 Signal G3 48 Way (Centre)
2 Bank 1 Ground J2 48 Way (Centre)
3 Bank 1 Heater H3 48 Way (Centre)
4 Bank 1 Battery Voltage - -
1 Bank 2 Signal G4 48 Way (Centre)
2 Bank 2 Ground J2 48 Way (Centre)
3 Bank 2 Heater H4 48 Way (Centre)
4 Bank 2 Battery Voltage - -
Sensor characteristics
Normal operating range is 0 – 1000mV
P0131 (Bank1) or P0151 (Bank2)
Monitor:
• Continuous.
Disable Criteria:
• DFCO(DecelerationFuelCutOff)
• AEDE(AccelerationEnrichmentDecelerationEnleanment)
• Misfire
Enable Criteria:
• Enginerunning
Failure Criteria:
• Sensorvoltage<15mVformorethan1.5secondsconsecutivelyforaspecifiednumberoftimes.
2009/02