Page 433 - Foton Workshop Manual - Tunland (AT)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-287

P2373，P2374，P2554-EXHAUST PRESSURE SENSOR FAILURE

P2373-EXHAUST PRESSURE SENSOR CIRCUIT -VOLTAGE IS
ABOVE NORMAL OR SHORTED TO HIGH VOLTAGE POWER

SUPPLY
P2374-EXHAUST PRESSURE SENSOR CIRCUIT -VOLTAGE IS 04
BELOW NORMAL OR SHORTED TO LOW VOLTAGE POWER

SUPPLY
P2554-EXHAUST PRESSURE - DATA IS UNSTABLE,

INTERMITTENT OR INCORRECT
Description

1 . An exhaust pressure sensor is used to measure the exhaust pressure of the
exhaust manifold.The engine control module (ECM) uses this information to
control the operation of the emissions and exhaust gas recirculation (EGR)
valves.The ECM provides a 5 volt power supply to the exhaust pressure sensor
through the sensor power circuit.The ECM also provides a ground to the sensor
circuit.The exhaust pressure sensor provides a signal to the ECM through the
exhaust pressure sensor signal circuit.The signal voltage of the sensor will vary
depending on the pressure of the exhaust manifold.
Circuit Diagram

Page 433