• | 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 | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5-Volt Reference | P0107, P0452, P0522, P0532, P0641, P2228 | P0069, P2228 | P0069, P0533, P0641, P2229 | P2227 |
BARO Sensor Signal | P0069, P2228 | P0069, P2228 | P0069, P2229 | P2227 |
Low Reference | -- | P0069, P2229 | -- | P2227 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: Altitude Versus Barometric Pressure | |||
5-Volt Reference | 0 kPa | 0 kPa | 128 kPa |
BARO Sensor Signal | 0 kPa | 0 kPa | 128 kPa |
Low Reference | -- | 124 kPa | -- |
The barometric pressure (BARO) sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5 volts to the BARO sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The BARO sensor provides a voltage signal to the ECM on a signal circuit relative to the atmospheric pressure changes. 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 105 kPa at or below sea level. The BARO sensor has a range of 0-128 kPa.
• | DTCs P0068, P0069, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0220, P0222, P0223, P0502, P0503, P2135, P2228, P2229 are not set. |
• | The engine run time is more than 10 seconds. |
• | The vehicle speed is less than 100 km/h (62 mph). |
• | The control module detects that 80 out of 100 BARO sensor samples that vary more than 10 kPa between each sample. |
• | The above condition is met 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 23738-A Mityvac |
• | J 35555 Metal Mityvac |
Ignition ON, observe the scan tool MAP and BARO sensor parameters. The readings should be within 5 kPa of each other, and also the current BARO for your location. Refer to Altitude Versus Barometric Pressure.
Start the vehicle and monitor the BARO parameter with the scan tool for a steady value.
⇒ | If the BARO parameter fluctuates rapidly: |
• | Test for an intermittent and for a poor connection at the BARO sensor. |
• | Test for proper BARO wiring harness routing. |
• | Test all of the BARO sensor circuits for intermittent shorts or opens. |
• | Test for an intermittent and for a poor connection at the control module. |
⇒ | If the circuits test normal, replace the BARO sensor. |
Important: You must perform the Circuit/System Testing before proceeding with the Component Test.
⇒ | If the voltage reading 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 |