CUMMINS FAULT CODE 221

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FAULT CODE 221

Barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source

Overview

CODE

REASON

EFFECT

Fault Code: 221

Barometric Pressure Sensor Circuit – Voltage Above Normal or Shorted to High

Power derate can occur depending on

PID:

Source. High signal voltage detected at barometric pressure circuit.

application and calibration.

SPN: 108

FMI: 3/3

LAMP: Amber

SRT:

Barometric Pressure Sensor Circuit – Industrial Engi

Barometric Pressure Sensor Circuit – Power Generation and M

Circuit Description

The barometric pressure sensor is used by the engine control module (ECM) to monitor the barometric pressure. This value is one of many inputs used by the ECM to determine the correct air/fuel ratio for proper engine operation.

Component Location

The barometric pressure sensor is mounted on the main branch of the engine harness on the fuel pump side of the engine. Use the following procedure for a detailed component location view. Refer to Procedure 100-002 in Section E.

Shop Talk

The barometric pressure sensor shares supply and return wires in the engine harness with other sensors. Opens and shorts in the engine harness can cause multiple fault codes to be active. Before troubleshooting Fault Code 221, check for multiple faults.

Possible causes of this fault code include:

  • Open return circuit in the harness, connectors, or sensor

  • Signal circuit shorted to sensor supply or battery voltage.

Refer to Troubleshooting Fault Code t05-221.

Last Modified: 28-Nov-2012

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