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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

P0122 is set when ACV position sensor voltage is lower than 200mV for 2.5 sec.

DTC Detecting Condition

Item	Detecting Condition			Possible Cause
DTC Strategy	• Signal monitoring			• ACV position sensor circuit • ACV
Enable Conditions	• Engine running
Threshold Value	• ACV position sensor voltage is lower than 200mV
Diagnostic Time	• 2.5sec.
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

note

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Signal Waveform & Data

Fig.1) Signal at idle

Fig.2) Signal when Key "ON" → "OFF"