Tuesday, January 7, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1249

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1249



Verification for DTC P0420 or P0430. Refer to DTC P0420 or P0430 (See: P Code Charts/P0420).



P0304



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.



* The evaporative emissions (EVAP) leak detection is not active.



* The delivered torque signal is greater than 6 % at idle.



* The delivered torque signal is between 6-21 % with the transmission in drive.



* DTCs P0300 through P0306 run continuously when the above conditions exist for at least 1,000 engine revolutions.



Conditions for Setting the DTC



P0300



The ECM detects a crankshaft rotation speed variation indicating a misfire rate sufficient to cause emissions levels to exceed a predetermined value.



P0301, P0302, P0303, P0304, P0305, P0306



The ECM detects a crankshaft rotation speed variation indicating a single cylinder misfire rate sufficient to cause emissions levels to exceed



mandated standards.



Action Taken When the DTC Sets



* DTCs P0300-P0306 are Type B DTCs.

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