P0335
DTC P0335 or 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 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 internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots 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 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 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
Note: The ECM detects engine movement by sensing the airflow through the mass air flow (MAF) sensor when it is more than 3 g/s, or by sensing camshaft position sensor pulses.
P0335
* 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.
OR
* The ECM detects that the engine has been running, but has not received a crankshaft position sensor pulse for 2 of 10 engine revolutions.
P0336
* The ECM detects that the engine is running, but receives less than 51 or more than 65 crankshaft position sensor pulses each engine revolution for 8 of 10 engine revolutions.
OR
* The ECM detects that the engine is running, but more than 20 resyncs occur within 25 s.
OR
* The ECM detects that the engine has been running, but the crankshaft does not sync for 0.1 s.
Action Taken When the DTC Sets
DTCs P0335 and P0336 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0335 and P0336 are Type B DTCs.
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 Relearning) for scan tool information
Circuit/System Verification
1. Ignition OFF, inspect the engine wiring harnesses carrying the crankshaft position sensor circuits for the following conditions:
* Close routing of aftermarket electrical equipment
* Close to solenoids, motors, and relays
• Correct any wire harness routing or component placement conditions if it is determined to be a possible source of electrical interference.
2. Ignition ON, engine OFF, use the Live Plot function on the scan tool. Select the engine speed parameter and the crankshaft position sensor parameter. Change the minimum spec to 400 RPM for both parameters. Change the maximum spec to 4,000 RPM for both parameters.
3. Start the engine and observe the scan tool.
4. Quickly accelerate and release the accelerator pedal several times. Do not accelerate past 4,000 RPM. The two graphed lines on the Live Plot display should track together across the screen.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the crankshaft position sensor.
2. Ignition OFF, test for less than 1 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 ECM.
Note: 5K ohm or greater in the 5 V reference circuit will cause this DTC to set.
3. Ignition ON, engine OFF, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 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 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. Ignition ON, engine OFF, test for 4.8-5.2 V between the signal circuit terminal 3 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 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 fused jumper wire to signal circuit terminal 3.
6. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post repeatedly. 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.
7. Ignition OFF, inspect the crankshaft position sensor for correct installation. Remove the crankshaft position sensor from the engine. Inspect the sensor and the O-ring for damage.
• If the sensor is loose, inspect the sensor and the O-ring for damage. Replace as necessary.
8. Inspect the engine for the following conditions:
* Engine oil for debris
* Crankshaft reluctor wheel for damage
* Timing chain, tensioner, and sprockets for wear or damage
• If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components.
9. If all circuits and components test normal, test or replace the crankshaft position sensor.
Component Testing
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
1. Remove the crankshaft position sensor and inspect the sensor and the O-ring for damage.
2. Connect the connector to the crankshaft position sensor.
3. Ignition ON, engine OFF, observe the Crankshaft Position Active Counter while passing a steel object by the tip of the sensor repeatedly. The Crankshaft Position Active Counter should increment.
• If the Crankshaft Position Active Counter 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 Relearning) for replacement, setup, and programming