Identification and detection of capacitive intake manifold pressure sensor 2

Structural diagram of capacitive intake manifold pressure sensor 2: Connection circuit between Ford's capacitive intake pressure sensor and computer diode

① Check the connection status of the vacuum hose to ensure there is no aging or cracking phenomenon.

② Turn on the ignition switch and check the voltage between terminal 26 (orange/black) of the ECU and the ground, which should be 5V.diode

③ The voltage of the 46 terminal signal circuit (black/white) should be 0V, and the grounding resistance should not exceed 5 Ω.

④ Check the intake pressure signal line (blue/yellow), remove the sensor connector connector, measure the voltage at terminal 45, and it is 0.5V when the ignition switch is turned on.diode

The frequency test of the intake pressure sensor can also be performed using a car specific multimeter. The testing method is to turn on the ignition switch, with the engine not running, and the output signal frequency of the intake pressure sensor is about 160Hz; the frequency during deceleration is 80Hz; and the frequency during idle is 105Hz.

When the intake pressure signal disappears or exceeds the working range (frequency less than 80Hz or greater than 162Hz), the electronic control unit ECU will issue a substitute value 9 based on the working condition of the throttle position sensor to ensure normal engine operation. However, the computer also records the faults caused by the intake pressure sensor and stores them in the form of fault codes.diode