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.
P2111 is set when ACV is open less than 6% of target value within 1sec or stuck open over 3sec.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Signal monitoring | 1. ACV | ||
Enable Conditions |
•
Engine Running | |||
Threshold Value |
•
AACV is open less than 6% of target value for 1sec or stuck open for 3sec. | |||
Diagnostic Time |
•
Refer to threshold value | |||
Fail Safe | Fuel Cut | NO |
•
- | |
EGR Off | YES | |||
Fuel Limit | YES | |||
Check Lamp | ON | |||
ACV actuator resistance |
23 Ω (between 1,3 terminal) |
Fig.1) Signal at idle
Fig.2) Signal when Key "ON" → "OFF"
