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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 18 (ENGINE CONTROLS - TESTS W/CODES - 7.4L (G SERIES))DIAGNOSTIC TROUBLE CODESDTC P0336 - CRANKSHAFT POSITION SENSOR CIRCUIT PERFORMANCEDIAGNOSTIC PROCEDURES
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F

Diagnostic Procedures

1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Diagnostic Procedures
WARNING: This page is about a different variant/trim than selected.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING - 7.4L article. After performing OBD system check, 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, with engine off. Using test light, probe ignition feed circuit of crankshaft position sensor connector (engine harness side) to ground. 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 20-40 percent, go to step 8). If duty cycle is not as specified, go to step 10).
  6. Repair open or short to ground in ignition feed circuit. After repairs, go to step 13).
  7. Check for open in ground circuit. If an open was found, go to step 11). If a problem was not found, go to step 9).
  8. With DVOM still connected, set DVOM to AC-volt scale. Crank engine. If voltage is greater than 10 volts, go to step 11). If voltage is less than 10 volts, go to next step.
  9. Check for open in signal circuit or ground circuit. If circuit is open, go to step 11). If circuit is okay, go to step 12).
  10. Replace crankshaft position sensor. Inspect sensor mounting surface and clean debris as necessary. After repairs, go to step 13).
  11. Repair as necessary. After repairs, go to step 13).
  12. Replace VCM. After replacing VCM, go to step 13).
  13. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0336. 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).
  14. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.