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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 5.7L) >> Diagnostic Trouble Codes >> DTC P0336 - Crankshaft Position Sensor Circuit Performance >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Start and run vehicle. If vehicle starts and continues to run, see DIAGNOSTIC AIDS. If vehicle does not start and continue to run, go to next step.
  3. Turn ignition off. Disconnect crankshaft position sensor connector. Turn ignition on, engine off. Using test light connected to ground, probe ignition feed circuit of crankshaft position sensor connector (engine harness side). If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
  4. Connect test light between ignition feed circuit and ground circuit of crankshaft position sensor connector (engine harness side). If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
  5. Turn ignition off. Install Gray jumper wires from Connector Test Kit(J 35616-A) between engine harness connector and crankshaft position sensor. Set DVOM to duty cycle position. Connect DVOM between signal circuit and ground circuit of crankshaft position sensor connector (engine harness side). Crank engine. If duty cycle is less than 40-60 percent (V6 engines) or less than 20-40 percent (V8 engines), go to step 8). If duty cycle is not as specified, go to step 9).
  6. Repair open or short to ground in CKP sensor ignition feed circuit. After repairs, go to step 12).
  7. Check for open in CKP sensor low circuit. If CKP sensor low circuit is open, go to step 10). If circuit is okay, go to step 11).
  8. Check for open in signal (3X) circuit or open in CKP sensor low circuit. If circuit is open, go to step 10). If circuit is okay, go to step 11).
  9. Replace CKP sensor. Perform CKP SYSTEM VARIATION LEARN PROCEDURE. After performing CKP learn procedure, go to step 12).
  10. Repair as necessary. After repairs, go to step 12).
  11. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  12. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  13. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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