DTC Description

When the sensor output is out of specification under enable condition, ECM sets DTC P0138 and turns the MIL on.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Signal monitoring

1.

Poor connector connection

2.

Short to power 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

-

Threshold Value

Downstream O2 sensor voltage is higher than 1.15V

Diagnosis Time

5 sec.

MIL ON Condition

3 driving cycles

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