Component Location
General Description

Intake and exhaust manifold pressure in diesel engine is equal to atmospheric pressure or bigger than it.

So it is difficult to recirculate exhaust gas within short time because the pressure difference of intake and exhaust manifold is not enough.

ACV(Air Control Valve) is installed before intake manifold.

This is shut when EGR is operated and the pressure difference come to be bigger. So EGR gas recirculation come to be easy.

ACV is consist of DC motor and position senser.

DTC Description

P2112 is set when ACV is open more than 6% of target value over 1sec or stuck close over 3sec.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Signal monitoring

1.

ACV

Enable Conditions

•

Engine Running

Threshold Value

•

ACV is open more than 6% of target value over 1sec or stuck close over 3sec.

Diagnostic Time

•

Refer to threshold value

Fail Safe

Fuel Cut

NO

•

-

EGR Off

YES

Fuel Limit

YES

Check

Lamp

ON

Specification

ACV actuator resistance

23 Ω (between 1,3 terminal)

Diagnostic Circuit Diagram
Signal Waveform & Data

Fig.1) Signal at idle

Fig.2) Signal when Key "ON" → "OFF"

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