Page 864 - Workshop Manual - Tunland (2017)

04-178 DIAGNOSTICS - ENGINE CONTROL SYSTEM

04
P1228，P2271，P2272-EXHAUST GAS RECIRCULATION (EGR)
VALVE POSITION
P1228-EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION

- DATA IS UNSTABLE, INTERMITTENT OR INCORRECT
P2271-EGREGR VALVE POSITION CIRCUIT - VOLTAGE IS ABOVE
NORMAL OR SHORTED TO HIGH VOLTAGE POWER SUPPLY

P2272-EGR VALVE POSITION CIRCUIT - VOLTAGE IS BELOW
NORMAL OR SHORTED TO LOW VOLTAGE POWER SUPPLY

Description
1 . The engine control module (ECM) uses an exhaust gas recirculation (EGR) valve
position sensor to determine whether the EGR valve conforms to the instruction
position.The ECM supplies 5 volts to the EGR valve position signal circuit, then
the EGR valve position sensor outputs a voltage signal to the ECM according
to the position of the valve. ECM converts this signal to a percentage from 0%
to 100%, indicating the position of the valve.The valve is fully opened, equivalent
to 100%.

Circuit Diagram