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 Instructions) provides 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 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.
Conditions for Running the DTC
* DTC P0101, P0102, P0103, P0641, or P0651 is not set.
* The engine is cranking or running.
* The airflow into the engine is greater than 3 g/s.
* The DTCs run continuously when the above conditions are met.
Conditions for Setting the DTC
Note: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by sensing camshaft position sensor pulses.
* 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 parked position.
* The ignition system defaults to a limp home mode. The camshaft position sensor is used to determine engine position.
Conditions for Clearing the DTC
DTC P0335 is a Type A DTC.
Diagnostic Aids
* With this DTC set, the engine may crank for an extended period of time during start-up.
* This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test (Component Tests and General Diagnostics).
Reference Information
Schematic Reference
Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
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 Relearning) for scan tool information
Special Tools
J 35616-A/BT-8637 - Connector Test Adapter Kit
Circuit/System Verification
1. Engine idling, observe the scan tool Crankshaft Position Active Counter parameter. The parameter should be incrementing.
2. Engine idling, observe the DTC information with a scan tool. DTC P0335 should not set.
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. Ignition OFF, disconnect the harness connector at the B26 crankshaft position sensor.
2. Ignition OFF and all vehicle systems OFF, it may take 2 minutes for all vehicle systems to power down, test for less than 1 ohm between the crankshaft position 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 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 K20 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 K20 ECM.
4. Ignition ON, 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 K20 ECM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 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 the battery negative post. The Crankshaft Position Active counter, should increment.
• If the Crankshaft Position Active counter increments, test or replace the B26 crankshaft position sensor.
• If the Crankshaft Position Active counter does not increment, replace the K20 ECM.
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 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 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 (Programming and Relearning) for ECM replacement, setup, and programming