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 sequence the ignition timing and fuel injection events for the engine. The ECM also uses CKP sensor output information to determine the crankshaft relative position to the camshaft, to detect cylinder misfire, and to control the CMP actuator if equipped.

Important: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 g/s, or by sensing camshaft position (CMP) sensor pulses.

P0335

P0336

DTC P0335 and P0336 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Description and Operation

Electronic Ignition (EI) System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Special Tools Required

J 35616 Connector Test Adapter Kit

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. Using the Live Plot function on the scan tool, select the CMP parameter. Change the minimum spec to 400, and the maximum spec to 4,000 RPM. Select the CKP sensor parameter. Change the minimum spec to 600, and the maximum spec to 3,300 RPM.
3. Observe the scan tool.
4. Quickly accelerate and release the accelerator pedal several times. Do not accelerate pass 3,200 RPM. The graphed lines on the live plot display should track together across the screen.

⇒	If the vehicle passes the Circuit/System Verification test, 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 data list.

P0335

1. Ignition OFF, disconnect the harness connector at the CKP sensor.
2. Test for less than 1 ohms 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 C 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 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 A 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.

⇒	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 the CKP signal circuit terminal A.
6. Ignition ON, momentarily touch the other 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.

P0336

1. Ignition OFF, inspect the CKP sensor for correct installation.

⇒	If the CKP sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary.

2. 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 engine components to determine the cause. Refer to Camshaft Timing Chain and Sprocket Cleaning and Inspection .

⇒	If any parts are worn or damaged, replace as necessary.

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.