The crankshaft position (CKP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. The CKP 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 CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP 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 CKP sensor. The ECM uses each CKP 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 CKP sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.

P0335

DTC P0335 is a Type B DTC.

DTC P0335 is a Type B DTC.

Inspect the CKP sensor connector and the ECM connector for corrosion.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, inspect the engine wiring harness carrying the CKP 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. Start the engine. Observe the Engine Speed parameter with the scan tool. The parameter should display the current engine speed matching the CMP Sensor parameter.

⇒	If the Engine Speed parameter displays a value other than the current engine speed, continue with Circuit/System Testing.

3. With the engine running, observe the CKP Active Counter parameter with the scan tool. The counter should increment from 0-255 and over again as the CKP sensor pulses are counted.

⇒	If the CKP Active Counter displays a value of 0, or a fixed value, continue with Circuit/System Testing.

4. Turn OFF the ignition for 60 seconds.
5. Start the engine. Do not cycle the ignition until this test is completed.
6. Operate the vehicle in various operating conditions within the Conditions for Running the DTC and observe the CKP Resync Counter parameter with the scan tool. The CKP Resync Counter should remain at 0 counts.

⇒	If the CKP Resync Counter increments, continue with Circuit/System Testing.

7. Engine running, observe the DTC information with a scan tool. DTC P0335 should not set.
8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Ignition OFF, disconnect the harness connector at the CKP sensor.
2. Test for less than 1 ohm of resistance between the CKP 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 ECM.

3. Ignition ON, test for 4.8-5.2 volts between the CKP 5-volt reference circuit terminal A and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Ignition ON, test for 4.8-5.2 volts between the CKP signal circuit terminal C 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 ECM.

5. Ignition ON, connect a test lamp between the CKP signal circuit terminal C and ground. The test lamp should not illuminate.

⇒	If the test lamp illuminates, test the CKP signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

6. Ignition OFF, connect a fused jumper wire to the CKP signal circuit terminal C.
7. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CKP Active counter parameter should increment.

⇒	If the CKP active counter increments, replace the CKP sensor.

⇒	If the CKP active counter does not increment, replace the ECM.

Important: You must perform the Circuit/System Testing before proceeding with Component Testing.

1. Inspect the CKP sensor for correct installation. Remove the CKP sensor from the engine and inspect the sensor O-ring for damage.

⇒	If the sensor is loose, incorrectly installed, or damaged, replace the CKP sensor.

2. Connect the CKP sensor harness connector to the CKP sensor.
3. Ignition ON, engine OFF, observe the CKP Active counter parameter on the scan tool.
4. Pass a flat steel object across the tip of the sensor repeatedly. The CKP Active counter parameter should increment with each pass of the steel object.

⇒	If the parameter does not increment, replace the CKP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.