DTC Description

If the lambda controller reaches the maximum or minimum threshold, then feedback control is no longer possible and emissions will be increased. The ECM sets DTC P2191 if no proportional post catalyst fuel trim adaptation occurs for a defined time after the lambda controller has reached its maximum threshold at part load.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Additive long term fuel trim upper limit monitoring

1.

Poor connector connection

2.

Air leakage in intake or exhaust system

3.

Improper fuel pressure

4.

Stuck PCV valve

5.

Clooged injector

General Enable

Condition

Coolant temperature is higher than 80.3℃(176.54℉)

Intake air temperature is lower than 80.3℃(176.54℉)

Lambda feedback control condition - active

Purge valve control duty is 0%

No MAP sensor error

No CVVT system error

No ATS error

No PCV error

No ECTS error

Enable Condition

Engine speed is higher than 500 RPM

Threshold Value

Long term fuel trim (Multiplicative) is higher than 1.25%

Diagnostic Time

30 sec.

MIL ON Condition

3 driving cycles

Яндекс.Метрика