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P0335



DTC P0335

Circuit Description

The crankshaft position (CKP) sensor is located on the rear of bank 1 of the engine block. The CKP sensor produces an AC voltage of different amplitude and frequency depending on the velocity of the crankshaft. The CKP sensor works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel are spaced 6 degrees apart with one span having a 12-degree space. The engine control module (ECM) uses the 12-degree space to determine top dead center for cylinders 1 and 4. The ECM determines when cylinder 1 is on the compression stroke by monitoring the CKP sensor and the camshaft position (CMP) sensors. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP sensor and the CMP sensor inputs. If the ECM does not detect a signal from the CKP sensor, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0335 Crankshaft Position (CKP) Sensor Circuit

Conditions for Running the DTC

* The engine is cranking or operating.
* The ECM detects more than 8 CMP sensor pulses.
* DTC P0335 runs continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM does not detect a signal from the CKP sensor for 5 seconds.

OR

The ECM does not recognize 3 or more reference pulses after the CKP signal is received.

Action Taken When the DTC Sets

* The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

* The control module turns OFF the malfunction indicator lamp (MIL) after 4 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
* A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
* Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

The following table illustrates the ECM connector locations:





* Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector. Using this kit prevents damage to the harness or component terminals.
* The ECM uses the camshaft position sensors to determine engine speed and position when there is a CKP sensor condition.
* The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a crankshaft position sensor condition other than a short to voltage in the signal circuit, the engine will go into a limp home mode after a hard restart. The ECM then calculates engine speed from one of the camshaft position sensors. During a limp home mode the following additional DTCs may set and should be ignored:

- DTC P0324 Knock Sensor (KS) Module Performance
- DTC P1011 Intake Camshaft Position Actuator Park Position Bank 1

* A short to voltage in the signal circuit of the CKP sensor will cause the engine to stall or not start and a DTC will not set.
* An intermittent condition in the CMP actuator solenoid circuits can cause a CKP DTC to set. Inspect the CMP actuator solenoid harness connections and related wiring, if you suspect this condition.
* The ECM uses a pull-up voltage of 2.5 volts on each CKP sensor circuit to reduce noise interference from electromagnetic interference (EMI). If the voltage is not present, replace the ECM.
* For an intermittent condition, Refer to Intermittent Conditions. Intermittent Conditions

Test Description

Step 1 - Step 9:




Step 10 - Step 19:




The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the condition is current.
4. This step tests the resistance of the CKP sensor and wiring. if the resistance is not within the specified range, test the circuits of the CKP sensor for an open or for a wire to wire short. CKP sensor and circuits that measure within the specified range may still have a condition. Test the signal circuit for a short to voltage, or a ground, and test the low reference circuit for a short to voltage, if the resistance is within the specified range.
6. This step tests the signal circuit of the CKP sensor for a short to ground.
7. This step tests for a short voltage in the signal and low reference circuits of the CKP sensor. If a voltage is present on either of the CKP circuits repair the short to voltage.
8. This step tests if the CKP sensor is capable of generating a signal. Inspect the CKP sensor for the correct installation and the correct fastener torque, or for a faulty sensor, if the CKP sensor output is less than the specified value.
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