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DTC P0336 (LF1, LFW)

DTC P0336 (LF1, LFW)

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC P0336

Crankshaft Position Sensor Performance

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
5 V Reference Circuit P0651 P0335 P0651, P2135 -
Crankshaft Position Sensor Signal Circuit P0335 P0335 P0335 P0336
Low Reference Circuit - P0335 P0335 -


Circuit/System Description

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

Conditions for Running the DTC


• DTCs P0101, P0102, P0103, P0340, P0341, P0641, or P0651 are not set.

• The engine is cranking or running.

• The airflow into the engine is greater than 3 g/s.

• The DTC runs continuously once the above conditions are met.


Conditions for Setting the DTC


• The ECM detects that the engine is running, but receives less than 51 or more than 65 crankshaft position sensor pulses each engine revolution for 8 of 10 engine revolutions.

• The ECM detects that the engine is running, but more than 19 resyncs occur within 25 seconds.

• The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 second.


Action Taken When the DTC Sets


• DTC P0336 is a Type B DTC.

• The camshaft position actuator is commanded to the Home or Parked position.


Conditions for Clearing the MIL/DTC

DTC P0336 is a Type B DTC.

Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Description and Operation


• Electronic Ignition System Description

• Engine Control Module Description


Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Engine Control Module Scan Tool Information (LF1,LFW) for scan tool information

Circuit/System Verification


1. Engine idling, observe the scan tool Crankshaft Position Active Counter parameter. The parameter should be incrementing.

2. Engine idling, check the DTC information with a scan tool. DTC P0335 should not be set.

3. 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.


Circuit/System Testing


1. Ignition OFF, disconnect the B26 crankshaft position sensor connector.

2. Ignition OFF, vehicle systems OFF, this may take 2 minutes. Test for less than 3 Ω between the low reference circuit pin 1 and ground.

3. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

5. If less than the specified range, test the 5 V reference circuit for an open circuit/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.

6. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

7. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.

8. 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 K20 ECM.

9. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

10. Ignition ON, engine OFF, using a 3 A jumper wire connected to ground, momentarily touch the crankshaft position sensor signal circuit terminal 2 repeatedly. The crankshaft position active counter parameter should increment.

11. If the crankshaft position active counter parameter does not increment, replace the K20 ECM.

12. If the crankshaft position active counter increments, test or replace the B26 crankshaft position sensor.


Component Testing

Note

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



1. Inspect the B26 crankshaft position sensor for looseness and correct installation. Remove the crankshaft position sensor from the engine and inspect the sensor and the O-ring for damage.

2. If the sensor is loose, incorrectly installed, or damaged, repair or replace the B26 crankshaft position sensor.

3. Connect the crankshaft position sensor connector to the crankshaft position sensor. Turn ON the ignition, with the engine OFF.

4. Observe the Crankshaft Position Active Counter parameter with a scan tool. Pass a steel object by the tip of the sensor repeatedly. The Crankshaft Position Active Counter parameter should increment.

5. If the function does not perform as specified, replace the B26 crankshaft position sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Crankshaft Position Sensor Replacement

• Control Module References for ECM replacement, setup, and programming