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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1568 (Engine Controls Diagnostic (DTC P0172 To DTC P0455) -- 5.7L) >> Diagnosis >> DTC P0336 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  This step tests for electromagnetic interference (EMI) on the CKP sensor circuits.
  2. 6:  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. 7:  Damage to the reluctor wheel can affect the CKP sensor output.
DTC P0336

Step Action Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference:  Powertrain Control Module (PCM) 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:
    • 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 (CKP) Sensor Replacement .
  2. Inspect the CKP sensor for the following conditions:
    • 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 Bearings 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 (CKP) 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
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