• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
5-Volt Reference Circuit | P0641, P2228 | P0069 | P0069, P2228 | P0069, P0641 | P2227 |
BARO Sensor Signal Circuit | P2228 | P0069 | P0069, P2228 | P0069, P2229 | P2227 |
Low Reference Circuit | -- | P0069 | P0069, P2227, P2229 | -- | P2227 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: The Ignition is ON Parameter Normal Range: BARO | |||
5-Volt Reference Circuit | 8-10 kPa | 8-10 kPa | 200-208 kPa |
BARO Sensor Signal Circuit | 8-10 kPa | 8-10 kPa | 200-208 kPa |
Low Reference Circuit | -- | 191 kPa | -- |
The barometric pressure (BARO) sensor measures the pressure of the atmosphere. This pressure is affected by altitude and weather conditions. A diaphragm within the BARO sensor is displaced by the pressure changes that occur from varying altitudes and weather conditions. The sensor translates this diaphragm action into the voltage signal input that is used by the engine control module (ECM) for diagnostics, emissions control, and to calculate fuel delivery.
Changes in BARO due to weather are relatively small, while changes due to altitude are significant. Pressure can range from 56 kPa at an altitude of 4 267 meters (14,000 feet), to 104 kPa at or below sea level. The BARO sensor has a 5-volt reference circuit, a low reference circuit and a signal circuit. The BARO sensor provides a voltage signal to the ECM on a signal circuit relative to barometric pressure changes.
• | DTCs P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0128, P0220, P0502, P0503, P2135, P2228, P2229 are not set. |
• | The engine run time is greater than 10 seconds. |
The ECM detects that 80 out of 100 consecutive BARO sensor samples vary greater than 10 kPa between each sample, for 10 seconds.
DTC P2227 is a Type B DTC.
DTC P2227 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 35555 Metal Mityvac
Engine running, monitor the BARO parameter with the scan tool for a steady value.
⇒ | If the BARO parameter is not a steady value, test the BARO circuit for an intermittent short or open. If all circuits test normal, replace the BARO sensor. |
Important: You must perform the Circuit/System Testing before proceeding with the Component Test.
⇒ | If the voltage is not within the specified range or is erratic, replace the BARO sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |