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Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 221

Ambient Air Pressure Sensor Circuit


Overview

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

High voltage detected at the ambient air pressure sensor circuit.

Derate in power output of engine.
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 located below 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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