Page 289 - Foton Workshop Manual - Tunland (AT)
P. 289
DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-143
P122，P123，P2973-INTAKE MANIFOLD 1 PRESSURE SENSOR
FAULT
P122-INTAKE MANIFOLD 1 PRESSURE SENSOR
CIRCUIT-VOLTAGE IS ABOVE NORMAL OR SHORTED TO HIGH
VOLTAGE POWER SUPPLY 04
P123-INTAKE MANIFOLD 1 PRESSURE SENSOR
CIRCUIT-VOLTAGE IS ABOVE NORMAL OR SHORTED TO HIGH
VOLTAGE POWER SUPPLY
P2973-INTAKE MANIFOLD 1 PRESSURE - THE DATA IS
UNSTABLE, INTERMITTENT OR INCORRECT
Description
1 . The engine control module (ECM) provides a 5V power source to the intake
manifold pressure sensor through the sensor power circuit.The ECM also
provides a grounding to the sensor circuit.The intake manifold pressure sensor
through its signal circuit provides a signal to the two ECM.The signal voltage
of the sensor will varies depending on the intake manifold pressure. Under
conditions of idling or deceleration, the ECM will detect a low signal voltage.
Under the condition of high load operation, the ECM will detect a high signal
voltage.
Circuit Diagram
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