Page 406 - Foton Workshop Manual - Tunland (AT)
P. 406
04-260 DIAGNOSTICS - ENGINE CONTROL SYSTEM
P1228，P2271，P2272-EXHAUST GAS RECIRCULATION (EGR)
VALVE POSITION
P1228-EXHAUST GAS RECIRCULATION (EGR) VALVE POSITION
- DATA IS UNSTABLE, INTERMITTENT OR INCORRECT
04 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
Page 406
