Page 735 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - ENGINE CONTROL SYSTEM 04-49

P122，P123，P2973-INTAKE MANIFOLD 1 PRESSURE SENSOR 04

FAULT
P122-INTAKE MANIFOLD 1 PRESSURE SENSOR

CIRCUIT-VOLTAGE IS ABOVE NORMAL OR SHORTED TO HIGH
VOLTAGE POWER SUPPLY
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