Circuit/System Description
The crankshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V circuit, low reference circuit and an output signal
circuit. The crankshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic
flux changes between the peaks and valleys of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth
spacing, with 2 missing teeth for the reference gap. The crankshaft position sensor produces an ON/OFF DC voltage of varying frequency, with 58
output pulses per crankshaft revolution. The frequency of the crankshaft position sensor output depends on the velocity of the crankshaft. The
crankshaft position sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel
rotates past the crankshaft position sensor. The ECM uses each crankshaft position signal pulse to determine crankshaft speed and decodes the
crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to sequence the ignition timing and fuel
injection events for the engine. The ECM also uses crankshaft position sensor output information to determine the crankshaft relative position to the
camshaft, to detect cylinder misfire, and to control the camshaft position actuator if equipped.
Conditions for Running the DTC
* DTC P0101, P0102, P0103, P0641, or P0651 is not set.
* The engine is cranking or running.
* The airflow into the engine is greater than 3 g/s.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
Note: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by
sensing camshaft position sensor pulses.
* The ECM detects that the starter is commanded on and the engine has been cranking for more than 4 s without a crankshaft position sensor
pulse.
* The ECM detects that the engine is running, but has not received a crankshaft position sensor pulse for 2 of 10 engine cycles.
Action Taken When the DTC Sets
* DTC P0335 is a Type A DTC.
* The camshaft position actuator if equipped is commanded to the parked position.
* The ignition system defaults to a limp home mode. The camshaft position sensor is used to determine engine position.
Conditions for Clearing the DTC
DTC P0335 is a Type A DTC.
Diagnostic Aids
* With this DTC set, the engine may crank for an extended period of time during start-up.
* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (See:
Starting and Charging/Testing and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).
Reference Information
Schematic Reference
Engine Controls Schematics (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/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
