2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1981
DTC P0300-P0308
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
DTC P0307
- Cylinder 7 Misfire Detected
DTC P0308
- Cylinder 8 Misfire Detected
Circuit/System Description
The engine control module (ECM) uses information from the crankshaft position (CKP) sensor in order to determine when an engine misfire is
occurring, and uses information from the camshaft position (CMP) sensor in order to determine which cylinder is misfiring. By monitoring
variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. If the ECM detects a misfire rate
sufficient to cause emission levels to exceed mandated standards, DTC P0300 sets. Under certain driving conditions, a misfire rate can be high
enough to cause the catalytic converter to overheat, possibly damaging the converter. The malfunction indicator lamp (MIL) will flash ON and OFF
when catalytic converter overheating conditions are present and DTC P0300 is set. DTCs P0301-P0308 corresponds to cylinders 1-8. If the ECM is
able to determine that a specific cylinder is misfiring, the DTC for that cylinder will also set.
Conditions for Running the DTC
* DTCs P0010, P0011, P0016, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123,
P0220, P0222, P0223, P0335, P0336, P0606, P0641, P0651, P1516, P2101, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, and
P2176 are not set.
* When DTC P0315 is set, the engine speed must be more than 1,000 RPM.
* Engine run time is more than 2 crankshaft revolutions.
* The engine speed is between 375-5,600 RPM.
* The ignition voltage is between 9-18 volts.
* The engine coolant temperature (ECT) is between -7 and +130掳C (+19 and +266掳F).
* When the startup ECT is colder than -7掳C (+19掳F), this diagnostic will be delayed until the ECT is warmer than +21掳C (+69掳F).
* The fuel level is more than 10 percent.
* The ECM is not in fuel shut-off, or decel fuel cut-off mode.
* The electronic brake control module (EBCM) and the traction control system (TCS) are not active or detecting rough road.
* An automatic transmission shift with a throttle position more than 95 percent is not occuring.
* The power management is not active.
* Excessive drive wheel slip is not detected.
* The power take-off (PTO) is disabled, where applicable.
* The cylinder deactivation is not in progress, where applicable.
