P0336
DTC P0335 or P0336 (LUW)
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 Instructionsprovide an overview of each diagnostic category.
DTC Descriptors
DTC P0335
- Crankshaft Position Sensor Circuit
DTC P0336
- 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 externally magnetic biased digital output integrated circuit sensing device. The sensor provides a pulse for each magnetic pole of the magnetic encoder wheel on the crankshaft. Each pole on the encoder wheel is spaced at 60-pole spacing, with 2 missing poles 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 encoder wheel, to the ECM as each pole 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 encoder wheel reference gap to identify crankshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses crankshaft position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.
Conditions for Running the DTC
* DTC P0335, P0365, P0366, P0641, P0651 are not set
* The engine is running.
* The DTC runs continuously.
Conditions for Setting the DTC
P0335
This sets if one of the following conditions occur:
* The ECM detects that the engine has been cranking for greater than 4 s without a crankshaft position sensor pulse.
* The engine is operating and the ECM does not detect a crankshaft position sensor pulse for greater than 0.1 s.
P0336
This sets if one of the following conditions occur:
* The ECM detects that the engine is running without detecting the synchronization gap on the reluctor wheel for greater than 0.4 s.
* The ECM detects that the engine is running, but receives less than 51 or greater than 65 crankshaft position sensor pulses, during one engine revolution.
Action Taken When the DTC Sets
* DTCs P0335 and P0336 are Type B DTCs.
* The ECM will use the camshaft position sensor for engine operation.
* Limp home mode activated.
Conditions for Clearing the DTC
* DTCs P0335 and P0336 are Type B DTCs.
* With a DTC set, the engine may crank for an extended period of time at start-up.
Diagnostic Aids
The following conditions may 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
• If there is a condition with the crankshaft position sensor, the tachometer will be inoperative
* The crankshaft position sensor may be out of range after a hot soak. Review the freeze frame/failure records for engine coolant temperature when the DTC set.
* The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition.
Reference Information
Schematic Reference
Engine Controls Schematics (LUW) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
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 Referencesfor scan tool information
Circuit/System Verification
Note: If you were sent here from Engine Cranks But Does Not Run proceed to Circuit/System Testing.
1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0651 is not set.
• If DTC P0651 is set, refer toDTC P0641, P0651, P0697, or P06A3 (LUW) Powertrain Management for further diagnosis.
2. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335 and P0336 should not set.
3. Engine cranking, observe the scan tool Engine Speed parameter. The scan tool should indicate an engine speed greater than 0 RPM.
4. Move related harnesses/connectors of the B26 Crankshaft Position Sensor and verify the engine does not stumble, stall, or change engine speed.
• If the above condition exists, repair the harness/connectors as necessary.
5. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. 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. If the B26 Crankshaft Position Sensor lead is damaged in any way, replace the B26 Crankshaft Position Sensor.
1. Ignition OFF, disconnect the harness connector at the B26 Crankshaft Position Sensor.
2. Ignition OFF, all vehicles systems OFF. It may take up to 2 min for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. 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.
4. Test for 4.8-5.2 V between the signal circuit terminal 1 and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. 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.
5. Ignition OFF, connect a 3 A fused jumper wire to the B26 Crankshaft Position Sensor signal circuit terminal 1.
Note: Additional DTCs may set when performing this test.
6. Ignition ON, momentarily touch the end of the fused jumper wire to ground while monitoring the scan tool Crankshaft Position Sensor. The Crankshaft Position Sensor should increment.
• If the Crankshaft Position Sensor does increment, replace the reluctor wheel.
• If the Crankshaft Position Sensor does not increment, replace the K20 Engine Control Module.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
Dynamic Test
1. Inspect the B26 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, engine OFF. Observe the Crankshaft Position Sensor Active Counter parameter on the scan tool.
4. Pass 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 parameter does not increment, 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 Referencesfor Engine Control Module replacement, programming and setup