2010 Cadillac CTS Sedan AWD V6-3.6L Page 1334
Circuit/System Description
The crankshaft position sensor is located on the rear of bank 1 of the engine block. The crankshaft position sensor is a hall effect switch that works
in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel is spaced 6 degrees apart with one span
having a 12 degree space. The engine control module (ECM) uses the 12 degree space to determine top dead center (TDC) for cylinders 1 and 4.
The ECM determines when cylinder 1 is on the compression stroke by monitoring the crankshaft position sensor and the camshaft position sensors.
The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the crankshaft position sensor and the
camshaft position sensor inputs.
Conditions for Running the DTC
* The engine is cranking or operating.
* The ECM has detected greater than 12 camshaft revolutions.
* The DTC P0335 and P0336 run continuously once the above conditions are met for greater than 5 s.
* The DTC P0338 runs once each engine revolution once the above conditions are met for greater than 2 s.
Conditions for Setting the DTC
P0335
* The ECM does not detect a signal from the crankshaft position sensor.
OR
* The ECM detects a crankshaft position signal without a reference pulse for greater than 6 revolutions.
P0336
* The ECM re-syncs the engine position greater than 2,600 times during an ignition cycle.
OR
* The ECM detects 28 or more interruptions in the engine speed signal during an ignition cycle.
P0338
The ECM detects a difference of greater than 250 teeth between reference gap position pulses.
Action Taken When the DTC Sets
DTCs P0335, P0336, and P0338 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0335, P0336, and P0338 are Type A DTCs.
Diagnostic Aids
The following conditions could also set the DTCs:
* Physical damage to the crankshaft position sensor or the reluctor wheel
* Excessive play or looseness of the crankshaft position sensor or the reluctor wheel
* Improper installation of the crankshaft position sensor or the reluctor wheel
* Foreign material passing between the crankshaft position sensor and the reluctor wheel
* Excessive air gap between the crankshaft position sensor and the reluctor wheel
* The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition.
* The engine will operate with a crankshaft position sensor condition only if the ECM has stored the learned reference position of the
camshafts in memory. With a crankshaft position sensor condition the engine will go into a limp home mode after a restart. The ECM then
calculates engine speed from one of the camshaft position sensors.
* An intermittent condition in the camshaft position sensor circuits may cause a crankshaft position DTC to set. Inspect the camshaft position
sensor, harness connections, and related wiring, if you suspect this condition.
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)
