Manifold Differential Pressure Sensor Circuit Malfunction

FAULT ID
P1400

TITLE
Manifold Differential Pressure Sensor Circuit Malfunction

BACKGROUND
- The manifold differential pressure sensor outputs a voltage which corresponds to the negative pressure in the intake manifold.
- The engine control module checks whether the voltage output by the manifold differential pressure sensor is within a specified range.

RANGE OF CHECK & SET CONDITIONS
- After the engine has warmed up, it runs at low or medium load.
- The engine coolant temperature at the time of starting the engine is 18°C (65.4°F) or more.
- The sensor output voltage is 4.5 V or more for 4 seconds, or the sensor Output voltage is 0.2 V or less for 4 seconds.

EFFECT
No limp-in

PROBABLE CAUSES
- Manifold differential pressure sensor failed.
- Open or shorted manifold differential pressure sensor circuit, or loose connector.
- Engine control module failed.