The hall effect crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. There are 57 teeth on the front of the crankshaft sprocket, plus a sync gap. The CKP sensor will output an ON/OFF pulse as each tooth passes the sensing element. The CKP sensor is connected directly to the engine control module (ECM) by the following circuits:

P0335

P0336

P0335

The ECM determines that there are no signal pulses from the CKP sensor.

P0336

The ECM detects CKP sensor pulses that are more than 0 but not equal to 57 teeth, and a sync gap per one crankshaft revolution.

DTCs P0335 and P0336 are Type A DTCs.

DTCs P0335 and P0336 are Type A DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Special Tools

J 38522 Variable Signal Generator

1. If DTCs P0642 or P0643 are set, diagnose those DTCs first.
2. The engine starts and runs.
3. Engine running, observe the DTC information with a scan tool. DTCs P0335 or P0336 should not set.
4. 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.

P0335

1. Ignition OFF and the scan tool disconnected for 90 seconds, disconnect the harness connector at the CKP sensor.
2. Test for less than 5 ohms between low reference circuit terminal 2 of the connector 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 5-volt reference 1 circuit terminal 3 of the connector and ground.

⇒	If less than the specified range, test the 5-volt reference 1 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 1 circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Test for 4.8-5.2 volts between the signal circuit terminal 1 of the connector 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 3A fused jumper wire between signal circuit terminal 1 of the connector and ground.
6. Ignition ON, observe the scan tool 5-Volt Reference 1 Circuit Status parameter. The parameter should display OK.

⇒	If the 5-Volt Reference 1 Circuit Status parameter does not display OK, test the signal circuit for a short to 5-volt reference. If the circuit tests normal, replace the ECM.

7. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal 1 of the connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
8. Set the J 38522 signal switch to 5 volts, the frequency to 5K, and the duty cycle to normal.
9. Ignition ON, observe the CKP Sensor Signal Present parameter of the scan tool. The parameter should display YES.

⇒	If the parameter does not display YES, replace the ECM.

10. If the circuits test normal replace the CKP sensor.

P0336

1. Ensure that the CKP sensor circuits are not routed too closely to the fuel injector wiring after-market add-on electrical equipment, solenoids, relays or motors.
2. Ignition OFF, inspect the CKP sensor for correct installation.

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

Important: Refer to Inducing Intermittent Fault Conditions for additional instructions on inducing intermittent conditions.

3. Engine running, observe the CKP Sensor Signal Present parameter of the scan tool while manipulating the related harnesses, connectors, and wires of the CKP sensor. The parameter should display Yes.

⇒	If the parameter displays No or fluctuates between Yes and No, inspect the related harness, connector, or wire for damage or poor connectivity at or near the point of the manipulation. Repair or replace as necessary.

4. Inspect the engine for the following conditions:

•	The engine oil for debris

•	The crankshaft reluctor wheel for damage or foreign material passing between the sensor and reluctor wheel

•	The timing chain, tensioner, and sprockets for wear or damage

5. If no other condition is found, replace the CKP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.