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Isuzu US-IDSS 2024 Diagnostic is a comprehensive tool for the effective maintenance and repair of Isuzu vehicles. It integrates advanced diagnostic features to assist technicians in identifying and resolving issues promptly. This system supports a wide range of Isuzu models, ensuring compatibility with both US and Canadian specifications. Its capabilities include vehicle recognition, fault code analysis, and real-time data access to streamline the diagnostic process.
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Cummins ISB CM550 (1990-94) Fault Code: 221 PID: 108 SPN: 108 FMI: 3 Ambient Air Pressue Sensor Circuit

Circuit Description
The ambient air pressure sensor monitors atmospheric pressure and passes information to the electronic control module (ECM) through the sensor harness.

Component Location
The ambient air pressure sensor is located below the fuel transfer pump.

Shop Talk
Monitor the ambient air pressure reading with a service tool to confirm that the pressure reading matches the actual air pressure. The ambient air pressure sensor is required with 300 horsepower rated engines and specific 275 horsepower rated engines.

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