2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2875

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2875

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool BARO sensor parameter is less than 2 kPa.

瀚慖f greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool BARO

sensor parameter is greater than 126 kPa.

瀚慖f less than the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace

the ECM.

6. If all circuits test normal, test or replace the BARO sensor.

Component Testing

Note: You must perform the Circuit/System Testing before proceeding with the Component Testing.

1. Ignition OFF, remove the BARO sensor.

2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the BARO sensor.

3. Install a jumper wire between the low reference circuit terminal 2 of the BARO sensor and ground.

4. Install a jumper wire at terminal B of the BARO sensor.

5. Connect a DMM between the jumper wire from terminal 3 of the BARO sensor and ground.

6. Ignition ON, with the J-23738-A or J-35555, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage

should vary between 0-5.2 V without any spikes or dropouts.

瀚慖f the voltage reading is erratic, replace the BARO sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Barometric Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Barometric Pressure

Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P2229

DTC P2228 or P2229

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2228

- Barometric Pressure (BARO) Sensor Circuit Low Voltage

DTC P2229

- Barometric Pressure (BARO) Sensor Circuit High Voltage

Diagnostic Fault Information