P0335
DTC P0335
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 Instructionsprovides an overview of each diagnostic category.
DTC Descriptor
DTC P0335
- Crankshaft Position Sensor Circuit
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 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.
The crankshaft position sensor signal circuit and the low reference circuits are also shared with the motor control module (MCM) 1. The MCM 1 uses the crankshaft position signal to determine engine crankshaft position to enable the Auto-Start function.
Conditions for Running the DTC
Note: The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor when airflow is greater than 3 gps or by sensing camshaft position sensor pulses.
* DTC P0101, P0102, P0103, P0340, P0341, P0641, or P0651 is not set.
* The engine is cranking or running.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
* 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 Park position.
Conditions for Clearing the DTC
DTC P0335 is a Type A DTC.
Diagnostic Aids
Note: After clearing the DTCs, the ECM must be completely powered down or the DTCs will not be cleared.
The engine will crank over for 1-3 s, resulting in a no-start condition, if DTCs P0335, P0336, P1AC6 or P1AC7 are set.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Electronic Ignition System Description Electronic Ignition System Description
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 Programming and Relearningfor scan tool information
Special Tools
J 35616-A/BT-8637 - Connector Test Adapter Kit
Circuit/System Verification
1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description Hybrid Modes of Operation.
2. Ignition ON, verify the scan tool hood position parameter displays Open.
• If the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for DTC P254F.
3. Ignition ON, observe the DTC information with a scan tool. DTCs P0641 and P0651 should not be set.
• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
4. Attempt to start the engine. The engine should start.
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.
1. Ignition OFF, disconnect the harness connector at the crankshaft position sensor.
2. Test for less than 3 ohm between the crankshaft position low reference circuit, terminal B, 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 ECM.
3. Ignition ON, test for 4.8-5.2 V between the crankshaft position 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 ECM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Test for 4.8-5.2 V between the crankshaft position 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 ECM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
5. Ignition OFF, connect a 3 A fused jumper wire to the crankshaft position signal circuit terminal A.
6. Ignition ON, momentarily touch the other end of the fused jumper wire to a good ground. The crankshaft position active counter should increment.
• If the crankshaft position active counter increments, test or replace the crankshaft position sensor.
• If the crankshaft position active counter does not increment, replace the ECM.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Ignition OFF, disconnect the harness connector at the crankshaft position sensor. Inspect the crankshaft position sensor for correct installation. Remove the 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 crankshaft position sensor.
2. Connect the crankshaft position sensor harness connector to the crankshaft position sensor.
3. Ignition ON, observe the scan tool Crankshaft Position Active counter parameter while repeatedly passing a flat steel object across the tip of the sensor. The CKP Active Counter parameter should increment.
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 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 Programming and Relearningfor ECM replacement, setup, and programming