2010 Cadillac CTS Sedan AWD V6-3.6L Page 805
DTC P029D, P02A1, P02A5, P02A9, P02AD, or P02B1 (w/LLT)
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 P029D
- Cylinder 1 Injector Leak Detected
DTC P02A1
- Cylinder 2 Injector Leak Detected
DTC P02A5
- Cylinder 3 Injector Leak Detected
DTC P02A9
- Cylinder 4 Injector Leak Detected
DTC P02AD
- Cylinder 5 Injector Leak Detected
DTC P02B1
- Cylinder 6 Injector Leak Detected
Circuit/System Description
The fuel injectors are mounted in the cylinder head beneath the intake ports and spray fuel directly into the combustion chamber. Direct injection
requires high fuel pressure due to the fuel injector's location in the combustion chamber. High pressure fuel is regulated by the high pressure fuel
pump actuator, which is a part of the high pressure fuel pump. The engine control module (ECM) monitors the actual fuel rail fuel pressure via the
fuel rail pressure sensor and commands the high pressure fuel pump actuator duty cycle in order to maintain the desired fuel rail pressure. If a fuel
injector delivers more fuel than is needed misfire counts will accumulate on that cylinder, and the ECM will not be able to maintain the desired fuel
rail pressure, indicating a stuck open or leaking fuel injector.
Conditions for Running the DTC
* The engine speed is between 1,520-6,000 RPM
* The engine load is less than 190 percent.
* The misfire monitor is enabled.
* DTCs P029D, P02A1, P02A5, P02A9, P02AD, and P02B1 run continuously once the conditions above have been met for approximately 20
seconds.
Conditions for Setting the DTC
The ECM detects a specific cylinder misfire rate of greater than 30 counts in less than 17 engine revolutions, and P0087 is set. The condition exists
for greater than 4 seconds or for a cumulative of 30 seconds.
Action Taken When the DTC Sets
* DTCs P029D, P02A1, P02A5, P02A9, P02AD, and P02B1 are Type A DTCs.
* The control module commands the engine to operate in the Reduced Engine Power mode.
* The message center displays Reduced Engine Power.
Conditions for Clearing the DTC
DTCs P029D, P02A1, P02A5, P02A9, P02AD, and P02B1 are Type A DTCs.
Diagnostic Aids
A fuel injector leak into the combustion chamber may result in mechanical damage to the cylinder.
