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P0336




DTC P0335, P0336, or P0338

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

DTC P0338
- Crankshaft Position Sensor Circuit High Duty Cycle

Diagnostic Fault Information





Circuit/System Description

The crankshaft position sensor is located on the rear of bank 1 of the engine block. The crankshaft position sensor is a hall effect switch that works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel is spaced 6 degrees apart with one span having a 12 degree space. The engine control module (ECM) uses the 12 degree space to determine top dead center (TDC) for cylinders 1 and 4. The ECM determines when cylinder 1 is on the compression stroke by monitoring the crankshaft position sensor and the camshaft position sensors. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the crankshaft position sensor and the camshaft position sensor inputs.

Conditions for Running the DTC

* The engine is cranking or operating.
* The ECM has detected greater than 12 camshaft revolutions.
* The DTC P0335 and P0336 run continuously once the above conditions are met for greater than 5 s.
* The DTC P0338 runs once each engine revolution once the above conditions are met for greater than 2 s.

Conditions for Setting the DTC

P0335
* The ECM does not detect a signal from the crankshaft position sensor.
OR
* The ECM detects a crankshaft position signal without a reference pulse for greater than 6 revolutions.

P0336
* The ECM re-syncs the engine position greater than 2,600 times during an ignition cycle.
OR
* The ECM detects 28 or more interruptions in the engine speed signal during an ignition cycle.

P0338

The ECM detects a difference of greater than 250 teeth between reference gap position pulses.

Action Taken When the DTC Sets

DTCs P0335, P0336, and P0338 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0335, P0336, and P0338 are Type A DTCs.

Diagnostic Aids

The following conditions could 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
* The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition.
* The engine will operate with a crankshaft position sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a crankshaft position sensor condition the engine will go into a limp home mode after a restart. The ECM then calculates engine speed from one of the camshaft position sensors.
* An intermittent condition in the camshaft position sensor circuits may cause a crankshaft position DTC to set. Inspect the camshaft position sensor, harness connections, and related wiring, if you suspect this condition.

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 ON, observe the DTC information with a scan tool. DTC P0697, P0698, or P0699 should not be set.

• If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM) (ECM).

2. Clear the DTC Info with a scan tool. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335, P0336, or P0338 should not set.
3. Observe the scan tool Crankshaft Position Resync parameter, the parameter should always display zero. Move the related harnesses/connectors of the crankshaft position sensor while observing the parameter, verify the engine does not stumble, or stall, and the parameter does not increment.
4. 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

1. Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
2. Disconnect the harness connector at the B26 crankshaft position sensor.
3. Test for 5 ohm or less between the low reference circuit terminal 1 and ground.

• If greater than the specified range, test for an open/high resistance in the low reference circuit. If the circuits/connections test normal, replace the K20 ECM.

4. Install the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
5. Ignition ON, test for greater than 4.8 V between the 5 V reference circuit terminal 3 and the low reference circuit terminal 1.

• If less than the specified value, test the 5 V reference circuit for a short to ground or for an open/high resistance. If the circuits/connections test normal, replace the K20 ECM.
• If greater than the specified value, test the 5 V reference circuit for a short to voltage. If the circuits/connections test normal, replace the K20 ECM.

6. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.

• If the voltage is greater than specified range, test for a short to voltage in the signal circuit. If circuit/connections test normal, replace the K20 ECM.
• If the voltage is less than the specified range, test for a short to ground or an open/high resistance in the signal circuit. If circuit/connections test normal, replace the K20 ECM.

7. If all circuits/connections test normal, test or 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

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