8508822-8508816-8508850-8508856-8508862-8508810-8508828

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

P2101 is set when ACV position can not follow the target position of ECM more than 1 sec.

DTC Detecting Condition

Item	Detecting Condition			Possible Cause
DTC Strategy	• Signal monitoring			• ACV actuator
Enable Conditions	• Engine running
Threshold Value	• Actuator temperature is high. • The differece of virgin and new learnt value is over limited value.
Diagnostic Time	• 1 sec.
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

To view Flash content, you need to install the appropriate browser extension

Signal Waveform & Data

Fig.1) Signal at idle

Fig.2) Signal when Key "ON" → "OFF"