DTC Description

When downstream O2 sensor signal output is not detected for pre-defined time, ECM sets DTC P0140.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Signal monitoring

1.

Poor connector connection

2.

Short/open in downstream O2 sensor signal circuit

3.

Faulty downstream O2 sensor

General Enable

Condition

30 sec. elapsed after downstream dew point end detected

Battery voltage is higher than 11V

Exhaust gas temperature around O2 sensor is higher than 350℃(662℉)

No downstream O2 sensor heater error

Enable

Condition

Case 1

Time duration for target lambda(1.12) is 12 sec.

Lambda feedback control value is at between 0.95 and 1.05

Case 2

Time duration for target lambda(0.88) is 12 sec.

Lambda feedback control value is at between 0.95 and 1.05

Osciliation test not completed

Threshold

Value

Case 1

Downstream O2 sensor voltage is higher than 0.65V

Case 2

Downstream O2 sensor voltage is lower than 0.65V

Diagnostic Time

95 sec.

MIL ON Condition

3 driving cycles

Яндекс.Метрика