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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P0335: Crankshaft Position Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Attempt to start the engine. Does the engine start and continue to run? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
  3. Turn OFF the ignition. Disconnect the CKP sensor harness connector. Turn ON the ignition, with the engine OFF. Connect a Digital Multimeter (DMM) between the 12-volt reference and a good ground. Does the DMM display a reading above 10 V? If yes, go to next step. If no, go to step  8.
  4. Connect a DMM between the 12-volt reference and the low reference circuit of the CKP sensor. Does the DMM display a reading above 10 V? If yes, go to next step. If no, go to step  7.
  5. Connect a DMM between the CKP sensor signal and a good ground. Does the DMM display 0 V? If yes, go to next step. If no, go to step  9.
  6. Turn OFF the ignition. Reconnect the CKP sensor. Disconnect the ECM connectors. Carefully remove the CKP signal circuit pin from the ECM connector. Reconnect the ECM connectors. Connect a DMM between the CKP signal circuit pin at the ECM and a good ground. Crank the engine and measure the DC duty cycle of the CKP signal. Does the DMM display a DC duty cycle of 45-55 percent? If yes, go to step  12. If no, go to step  10.
  7. Test the low reference circuit for an open. Did you find and correct the condition? If yes, go to step  17. If no, go to step  12.
  8. Test the 12-volt reference circuit for an open or a short to ground. Did you find and correct the condition? If yes, go to step  17. If no, go to step  12.
  9. Test the CKP signal circuit for a short to voltage or a short to the 12-volt reference circuit. Did you find and correct the condition? If yes, go to step  17. If no, go to step  15.
  10. Test the CKP signal circuit for an open or a short to ground. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  11. Check for poor connections at the CKP sensor. Did you find and correct the condition? If yes, go to step  17. If no, go to step  13.
  12. Inspect for poor connections at the ECM. If you find a poor connection, repair the condition as necessary. Did you complete the repair? If yes, go to step  17. If no, go to step  15.
  13. Inspect the CKP sensor for damage or looseness. Did you find and correct the condition? If yes, go to step  17. If no, go to next step.
  14. Inspect the CKP reluctor wheel for damage or looseness. If you find the CKP reluctor wheel damaged, see appropriate article in ENGINES to repair. Did you find and correct the condition? If yes, go to step  17. If no, go to step  16.
  15. Replace the ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram ECM. See ENGINE CONTROL MODULE  under PROGRAMMING. After repairs, go to step  17.
  16. Replace the CKP sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  17. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  18. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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