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Barometric Pressure Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 221 PID: P108 SPN: 108 FMI: 3/3 LAMP: Amber SRT: |
Barometric Pressure Sensor – shorted high. High signal voltage detected at barometric pressure circuit. |
Engine power derate. |
 Barometric Pressure Sensor Circuit
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Circuit Description
The barometric pressure sensor is used by the electronic 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 near the ECM. Refer to Section E for a detailed component location view.
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
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