PUMP GP-PS- 3Z4624 - Caterpillar

Atmospheric Pressure Sensor
Atmospheric pressure sensor (3) measures the atmospheric pressure in the crankcase. A signal is sent to the Electronic Control Module (ECM).
Table 1
Atmospheric Pressure Sensor
Operating pressure range 0 to 116 kPa (0 to 16.8 psi) Boost Pressure Sensor
Boost pressure sensor (4) provides a signal which corresponds to turbocharger outlet pressure to the ECM. The air/fuel ratio control utilizes the actual engine speed and the turbocharger outlet pressure in order to control the transient smoke level. The ECM can control injection timing and the amount of fuel that is injected. When the throttle is increased and when the engine demands more fuel, the fuel limit is controlled in order to reduce overall smoke levels of the engine exhaust.Failure of the Boost Pressure Sensor
The ECM will detect failure of the boost pressure sensor. The operator will be warned of the problem through the diagnostic lamp. The strategies that are related to the boost will be disabled. Engine power will be severely reduced in the event of a failure of the boost pressure sensor. A failure of the boost pressure sensor will not