P0336
DTC P0335, P0336, or P0338
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0335
- Crankshaft Position (CKP) Sensor Circuit
DTC P0336
- Crankshaft Position (CKP) Sensor Performance
DTC P0338
- Crankshaft Position (CKP) Sensor Circuit High Duty Cycle
Diagnostic Fault Information
Circuit/System Description
The crankshaft position (CKP) sensor is located on the rear of bank 1 of the engine block. The CKP 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 CKP sensor and the camshaft position (CMP) sensors. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP sensor and the CMP sensor inputs.
Conditions for Running the DTC
* The engine is cranking or operating.
* The ECM has detected greater than 12 camshaft revolutions.
* The DTCs run continuously once the above conditions are met for greater than 5 seconds.
Conditions for Setting the DTC
P0335
* The ECM does not detect a signal from the CKP sensor.
OR
* The ECM detects a CKP signal without reference pulse for greater than 3 revolutions.
* Either condition exists for greater than 5 seconds or a cumulative of 50 seconds.
P0336
* The ECM re-syncs the engine position 6 or greater times during an ignition cycle.
OR
* The ECM detects 14 or greater interruptions in the engine speed signal during an ignition cycle.
* Either condition exists for greater than 4 seconds or a cumulative of 50 seconds.
P0338
* The ECM detects a difference of greater than 8 teeth between reference gap position pulses for 4 consecutive crankshaft revolutions in which the same number of pulses are detected each crankshaft revolution.
* The condition exists for greater than 4 seconds, or a cumulative of 50 seconds.
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 CKP sensor or the reluctor wheel
* Excessive play or looseness of the CKP sensor or the reluctor wheel
* Improper installation of the CKP sensor or the reluctor wheel
* Foreign material passing between the CKP sensor and the reluctor wheel
* Excessive air gap between the CKP sensor and the reluctor wheel
* The ECM uses the camshaft position sensors to determine engine speed and position when there is a CKP sensor condition.
* The engine will operate with a CKP 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. During a limp home mode the following additional DTCs may set and should be ignored:
- DTC P0324 Knock Sensor (KS) Module Performance
- DTC P1011 Intake Camshaft Position Actuator Park Position Bank 1
* An intermittent condition in the camshaft position (CMP) sensor circuits can cause a CKP DTC to set. Inspect the CMP sensor, harness connections, and related wiring, if you suspect this condition.
Reference Information
Schematic Reference
Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Electronic Ignition (EI) System Description (Electronic Ignition (EI) System Description)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, clear the diagnostic trouble code (DTC) information with a scan tool. Attempt to start the engine, observe the scan tool DTC information. DTC P0335, P0336, or P0338 should not set.
2. Move related harnesses/connectors of the CKP sensor and verify the engine does not stumble, stall, or change engine speed.
3. 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 are captured in the Freeze Frame/Failure Records Data List.
Circuit/System Testing
1. Ignition ON, clear the DTCs with a scan tool.
2. Engine idling, raise the engine speed to 1,000 RPM for 30 seconds, and then return to idle. Move the related CKP harnesses and connectors between the CKP and the ECM. Verify the engine does not stall or stumble.
• If the engine stalls or stumbles, repair the harness/connections as necessary.
3. Ignition OFF, inspect the CKP harness for the following:
* Routed too close to the battery or the battery cables
* Routed too close to other wiring or components
* Routed too close to after market add on electrical equipment
* Routed too close to solenoids, relays, and motors
• If a condition is located, repair as necessary.
4. Disconnect the harness connector at the CKP sensor.
5. Ignition ON, test for 2-3 volts between the signal circuit terminal 2 and ground.
• If less than the specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuits/connections test normal, replace the ECM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.
6. Test for 2-3 volts between the low reference circuit terminal 1 and ground.
• If less than the specified range, test the low reference circuit for a short to ground or an open. If the circuit/connections test normal, replace the ECM.
• If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
7. Remove the CKP sensor-Refer to Crankshaft Position Sensor Replacement (Service and Repair).
8. Inspect the crankshaft reluctor wheel for damage.
• If the crankshaft reluctor wheel is damaged-Refer to Crankshaft and Bearing Cleaning and Inspection (Overhaul) , and replace the CKP sensor.
9. If all circuits/connections test normal, test or replace the CKP sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the CKP sensor.
2. Test for 700-1,200 ohms of resistance between the signal circuit and low reference circuit of the CKP sensor.
• If not within the specified range, replace the CKP sensor.
3. Disconnect the fuel pump relay.
4. Set the DMM to the AC voltage scale.
5. While cranking the engine, test for greater than 1.3 VAC between the signal circuit and low reference circuit of the CKP sensor.
• If less than the specified range, replace the CKP 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 engine control module replacement, setup, and programming