2010 Cadillac Truck SRX AWD V6-3.0L Page 1451
detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past
the camshaft position sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The
sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent
an image of the camshaft reluctor wheel. The frequency of the camshaft position sensor output depends on the velocity of the camshaft. The ECM
decodes the narrow and wide tooth pattern to identify camshaft position. The ECM uses the cylinder 1 intake camshaft position sensor to determine
injector and ignition system synchronization. Also, the cylinder 1 intake camshaft position sensor is used to determine camshaft to crankshaft
relationship. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses camshaft
position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home
operation.
Conditions for Running the DTC
Note: The ECM detects engine movement by sensing the airflow through the MAF sensor when airflow is greater than 3 g/s, or by sensing
crankshaft position sensor pulses.
* DTC P0102, P0103, P0335, P0336, P0641, P0651, or P0697 is not set.
* The engine is cranking or running.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
* The ECM detects that the starter is commanded ON and the engine has been cranking for more than 4 seconds without a camshaft position
sensor pulse.
* The ECM detects that the engine has started, but did not receive a camshaft position sensor pulse during the first engine revolution.
* The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1,000 engine cycles.
Action Taken When the DTC Sets
* DTCs P0340, P0345, P0365, and P0390 are Type B DTCs.
* The camshaft position actuator is commanded to the Home or Parked position.
Conditions for Clearing the MIL/DTC
DTCs P0340, P0345, P0365, and P0390 are Type B DTCs.
Diagnostic Aids
* With a DTC set, the engine may crank for an extended period of time at start-up.
* The cylinder 1 intake camshaft position sensor is used for injector and ignition system synchronization. A stalling condition will occur if the
CMP sensor signal is intermittent and a DTC will not set. Inspect all cylinder 1 intake camshaft position sensor circuits for poor connections.
Reference Information
Schematic Reference
Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Electronic
Ignition System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
