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ISB/ISBe Series Engines – FAULT CODE 221

Ambient Air Pressure Sensor


Overview

CODE REASON EFFECT
Fault Code: 221
PID: P108
SPN: 108
FMI: 3
LAMP: Yellow
SRT: 

Ambient air pressure sensor (internal to the ECM) has had a failure.

Possible black smoke. Engine protection system can be affected. Altitude derate will not function.
Ambient Air Pressure Sensor Circuit
SMALL | MEDIUM | LARGE

Circuit Description

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

Component Location

The ambient air pressure sensor is internal to the ECM.

Shop Talk

Monitor the ambient air pressure reading with a service tool to confirm that the pressure reading matches the actual air pressure.

Refer to Troubleshooting Fault Code t05-221

Last Modified:  26-Oct-2010
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