P0336
DTC P0336
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0336
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Crankshaft Position Sensor Performance
Diagnostic Fault Information
Circuit/System Description
The crankshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference 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 two 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
Condition 1
* DTCs P0101, P0102, P0103 is not set.
* The engine is cranking.
* The engine airflow is greater than 3 g/s.
Condition 2
* DTC P0651 is not set.
* The engine is running.
Condition 3
* DTCs P0335 or P0651 is not set.
* The engine is running and engine speed is greater than 450 RPM.
* The engine airflow is greater than 3 g/s.
Condition 4
* DTCs P0340, P0341, P0641, or P0651 is not set.
* The engine is running or engine is cranking.
The DTC P0336 runs continuously when the above conditions are met.
Conditions for Setting the DTC
* The ECM detects that the engine is running, but receives less than 53 or more than 63 crankshaft position sensor pulses, during each engine revolution, for 8 of 10 engine revolutions.
* The ECM detects that the engine is running, but more than 25 crankshaft resyncs have occurred within 20 s.
* The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 s.
Action Taken When the DTC Sets
DTC P0336 is a Type A DTC.
Conditions for Clearing the DTC
DTC P0336 is a Type A DTC.
Diagnostic Aids
With this DTC set, the engine may crank for an extended period of time during start-up.
Reference Information
Schematic Reference
Engine Controls Schematics (LS3) [1][2]Electrical DiagramsEngine Controls Schematics (LS9) [1][2]Electrical DiagramsEngine Controls Schematics (LS7) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Folding Top 5 Bow Lowered Switch (CM7)
Description and Operation
Electronic Ignition System Description Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Clear the DTC information with a scan tool. Attempt to start the engine. Observe the DTC information with a scan tool. DTC P0335 should not set.
2. Engine idling, observe the scan tool Crankshaft Position Resync Counter parameter. The parameter should always display zero. Move the related harnesses/connectors of the B26 crankshaft position sensor while observing the parameter. Verify the engine does not stumble or stall, and the parameter does not increment.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not set. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. DTC P0336 should not be set.
• If DTC P0336 is set, inspect the engine for the conditions listed below and repair as necessary:
* Excessive play or looseness of the CKP sensor or the reluctor wheel.
* Improper installation of the CKP sensor.
* Foreign material passing between the CKP sensor and the reluctor wheel.
* Excessive air gap between the CKP sensor and the reluctor wheel.
* Engine oil for debris.
* Timing chain, tensioner, and sprockets for wear or damage.
2. Ignition OFF, disconnect the harness connector at the B26 crankshaft position sensor.
3. Ignition OFF, vehicle systems OFF. It may take 2 minutes, test for less than 1 ohms between the low reference circuit, terminal B, and ground.
• If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit, terminal C and ground.
• If less than the specified range, test the 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 engine control module.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.
• If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 engine control module.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
6. Ignition OFF, connect a 3 A fused jumper wire to the signal circuit terminal A.
Note:
Additional DTCs may set when performing this test.
7. Ignition ON, momentarily touch the other end of the fused jumper wire to ground repeatedly while monitoring the scan tool Crankshaft Position Sensor Active Counter parameter. The Crankshaft Position Active counter, should increment.
• If the Crankshaft Position Active counter does not increment, replace the K20 engine control module.
8. If all circuits and components test normal, test or replace the B26 crankshaft position sensor.
Component Testing
Note:
You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Inspect the crankshaft position sensor for correct installation. Remove the B26 crankshaft position sensor from the engine and inspect the sensor O-ring for damage.
• If the sensor is loose, incorrectly installed, or damaged, replace the B26 crankshaft position sensor.
2. Connect the crankshaft position sensor harness connector to the B26 crankshaft position sensor.
3. Ignition ON, observe the Crankshaft Position Active counter parameter with a scan tool while passing a flat steel object across the tip of the sensor repeatedly. The Crankshaft Position Active counter parameter should increment with each pass of the steel object.
• If the function does not perform as specified, replace the B26 crankshaft position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Crankshaft Position Sensor Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, setup, and programming