2010 Cadillac CTS Sedan AWD V6-3.6L Page 1336
P0338
DTC P0335, P0336, or P0338 (w/LLT)
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 P0335
- Crankshaft Position Sensor Circuit
DTC P0336
- Crankshaft Position Sensor Performance
DTC P0338
- Crankshaft Position Sensor Circuit High Duty Cycle
Diagnostic Fault Information
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
