2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1236

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1236

temperature, boost pressure, sensor. Verify the scan tool Boost Pressure Sensor parameter responds to the applied pressure.

瀚慖f the scan tool Boost Pressure Sensor parameter does not increase with the applied pressure, replace the B65 intake air pressure and

temperature sensor.

4. Inspect the turbocharger oil supply lines for a restriction.

瀚慖f restricted, repair or replace as necessary.

5. If all other components test normal, test or replace the turbocharger.

Repair Instructions

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

* Turbocharger Pressure Sensor Replacement (See: Powertrain Management/Fuel Delivery and Air Induction/Turbocharger/Service and

Repair/Turbocharger Pressure Sensor Replacement) for intake air pressure and temperature sensor replacement.

* Turbocharger Removal (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/20. Turbocharger Removal)

* Turbocharger Disassemble (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/101. Turbocharger Disassemble)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0300

DTC P0300-P0306 (LAU)

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 P0300

- Engine Misfire Detected

DTC P0301

- Cylinder 1 Misfire Detected

DTC P0302

- Cylinder 2 Misfire Detected

DTC P0303

- Cylinder 3 Misfire Detected

DTC P0304

- Cylinder 4 Misfire Detected

DTC P0305

- Cylinder 5 Misfire Detected

DTC P0306

- Cylinder 6 Misfire Detected

Circuit/System Description

The engine control module (ECM) uses information from the crankshaft position sensor and the camshaft position sensors in order to determine

when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect

individual misfire events. A misfire rate that is high enough can cause 3-way catalytic converter damage. The malfunction indicator lamp (MIL)

will flash ON and OFF when the conditions for catalytic converter damage are present. DTCs P0301 through P0306 correspond to cylinders 1

through 6. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder will set.

Conditions for Running the DTC

* DTC P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, or P0338 is not set.

* The engine speed is between 450-6,500 RPM.