GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Corvette 🢒 Engine 🢒 Engine Controls - 5.7L 🢒 DTC P0336

Circuit Description

The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor is connected directly to the powertrain control module (PCM) and consists of the following circuits:

    • The 12-volt reference circuit
    • The low reference circuit
    • The CKP sensor signal circuit

If the PCM detects that the CKP sensor is inconsistent for less than 2 seconds.

Conditions for Running the DTC

The engine is cranking or running.

Conditions for Setting the DTC

The PCM determines that the CKP sensor signal is for less than 2 seconds.

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 3 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.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests for electromagnetic interference (EMI) on the CKP sensor circuits.

    2.

  2. Vertical lines across the face of the sensor may indicate foreign material passing between the CKP sensor and the reluctor wheel. Lines which are not vertical across the face of the sensor may indicate a crack in the CKP sensor. Either of these conditions will cause this DTC to set.

    3.

  3. Damage to the reluctor wheel can affect the CKP sensor output.

Step

Action

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views

1

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

    Important: Before proceeding with this DTC, diagnose DTC P0335, if active.

  1. Observe the Freeze Frame/Failure records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  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.

Does the DTC fail this ignition?

Go to Step 3

Go to Intermittent Conditions

3

  1. Inspect the CKP sensor for circuit harnesses and for wires that are routed too close to the following components:
    2. • The wires to other components, or the secondary ignition wires
    • Aftermarket add-on electrical equipment
    • The solenoids
    • The relays
    • The motors
  2. Inspect for incorrect harness routing.

Did you find and correct the condition?

Go to Step 9

Go to Step 4

4

Test for poor connections at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 5

5

Test for poor connections at the PCM for the CKP sensor circuits, refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

  1. Remove the CKP sensor. Refer to Crankshaft Position Sensor Replacement .
  2. Inspect the CKP sensor for the following conditions:
    3. • Excessive air gap between the CKP sensor and the reluctor wheel
    • Foreign material passing between the CKP sensor and the reluctor wheel
    • Physical damage
    • Improper installation
    • Electromagnetic interference in the CKP sensor circuits

Did you find and correct the condition?

Go to Step 9

Go to Step 7

7

Inspect the CKP reluctor wheel for the following conditions:

    • Physical damage
    • Improper installation
    • Excessive endplay or looseness

Refer to Crankshaft and Bearing Removal in Engine Mechanical.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

8

Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement .

Did you find and correct the condition?

Go to Step 9

--

9
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  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.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 10

10

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK