P0335

DTC P0335 or P0336

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P0335
- Crankshaft Position (CKP) Sensor Circuit

DTC P0336
- Crankshaft Position (CKP) Sensor Performance

Diagnostic Fault Information






Circuit/System Description

The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft, and the AC voltage output depends on the crankshaft position and battery voltage. The CKP sensor works in conjunction with a 58X reluctor wheel attached to the crankshaft. The engine control module (ECM) can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP and the camshaft position (CMP) sensor inputs. The CKP sensor is also used to detect misfire and tachometer display.

Conditions for Running the DTC

* DTCs P0016 and P0340 are not set.
* The engine is cranking or running.
* The DTCs run continuously once the above conditions are met.

Conditions for Setting the DTC

DTC P0335

The ECM does not detect a signal from the CKP sensor.

DTC P0336

The ECM detects an incorrect number of CKP reference pulses for 10 consecutive crankshaft revolutions.

Action Taken When the DTC Sets

* DTCs P0335 and P0336 are Type B DTCs.
* The ECM will use the camshaft position (CMP) sensor for engine operation.

Conditions for Clearing the DTC

DTCs P0335 and P0336 are Type B 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

Circuit/System Verification

Important: If you were sent here from Engine Cranks but Does Not Run, proceed to Circuit/System Testing.

1. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335 and P0336 should not set.
2. Observe the Engine Speed parameter while cranking the engine. The scan tool should indicate an engine speed greater than 0 RPM.
3. Move related harnesses/connectors of the CKP sensor and verify the engine does not stumble, stall, or change engine speed.
4. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

Important: If the CKP sensor lead is damaged in any way, replace the CKP sensor.

1. Ignition OFF, disconnect the harness connector of the CKP sensor.
2. Ignition ON, verify that 2-3 volts is available on the signal circuit and the low reference circuit.

• If less than the specified range, test the applicable 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 applicable circuit for a short to voltage. If the circuits/connections test normal, replace the ECM.

3. If all circuits/connections test normal, test or replace the CKP sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector of the CKP sensor.

Important: If the CKP sensor lead is damaged in any way, replace the CKP sensor.

2. Test for 500-700 ohms between the signal circuit and low reference circuit of the CKP sensor.

• If the resistance is 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 500 mVAC between the signal circuit and low reference circuit of the CKP sensor.

• If less than the specified value, replace the CKP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Crankshaft Position Sensor Replacement
* Programming and Relearning for ECM setup, and programming Programming and Relearning