The Air Intake Sensor (AIP) is threaded into the intake manifold. See Figure 27369 . The Series 50G natural gas engines use a wide range sensor that allows pressure measurement under conditions of either manifold vacuum or boost.
1. Intake Manifold
2. Intake Manifold Inlet
6. Air Temperature Sensor (different location on the high pressure fuel system)
3. Intake Manifold Gasket
4. Cylinder Head
8. Turbo Boost Sensor
Air Intake Pressure Sensor Series 50G
This device is a pressure sensor that sends an electrical signal to the ECM. The ECM uses this information to compute the amount of air entering the engine. Fuel supply is regulated by the TBS information to control engine air fuel ratio. The AIP information is also used to control ignition timing.
Note: S50G GFI controlled fuel system that has been converted to the DDEC controlled closed loop fuel system, the AIP was moved from the intake manifold to the side of the intake elbow.
The AIP is non-serviceable and must be replaced as an assembly. No adjustment is required.
Remove the AIP as follows:
Install the AIP as follows:
Note: The AIP is an electronic device. Use care during installation.