2010 Cadillac CTS Sedan AWD V6-3.6L Page 1339
output signal circuit. The camshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor
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. 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.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (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)
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/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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)
Scan Tool Reference
Engine Control Module Scan Tool Information (V6) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Scan
Tool Testing and Procedures)Engine Control Module Scan Tool Information (V8) (See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures)Engine Control Module Scan Tool Information (LF1) (See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures) for scan tool information
Circuit/System Verification
