Page 480 - Foton Workshop Manual - Tunland (AT)

04-334 DIAGNOSTICS - ENGINE CONTROL SYSTEM

P3382，P3383-ENGINE EGR SYSTEM FAULT

P3382-ENGINE EGR SYSTEM - DATA IS VALID BUT BELOW
NORMAL OPERATING RANGE - MEDIUM SEVERITY LEVEL

P3383-ENGINE EGR SYSTEM - DATA VALID BUT ABOVE

04 NORMAL OPERATING RANGE - MEDIUM SEVERITY LEVEL
Description
1 . The engine control module (ECM) uses the EGR pressure differential sensor
readings to determine the amount of exhaust flowing through the EGR connection
pipe to the intake manifold.The EGR differential pressure sensor uses two
exhaust ports to measure the pressure drop which flows through the EGR
pressure differential orifice.The sensor outputs a voltage that represents the
pressure difference between two ports, then the ECM associates the voltage
with the EGR flow rate.This information is used to control the EGR valve to
achieve the correct emission level.
2 . The ECM provides a 5 volt power supply to the EGR differential pressure sensor
through the sensor power circuit.The ECM also provides a ground to the sensor
circuit.The EGR differential pressure sensor provides a signal to the ECM
through the EGR pressure differential sensor signal circuit.The signal voltage
of the sensor will vary according to the pressure difference of cross-under pipe.

Circuit Diagram

Page 480