LEMON Manuals: Even more car manuals for everyone
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 P0339 - Crankshaft Position Sensor Circuit Intermittent >> 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. Check if engine starts and continues to run. If engine starts and continues to run, see DIAGNOSTIC AIDS. If engine does not start and or starts and stall, 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. Install test light between CKP sensor connector (engine harness side) ignition feed circuit and ground circuit. 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 40-60 percent, go to step 8). If duty cycle is not 40-60 percent, 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 circuit is open, go to step 11). If circuit is okay, go to step 9).
  8. With DVOM still connected, set DVOM to AC volt scale. Crank engine. If voltage reading is greater than 10 volts, go to step 11). If voltage reading is not greater 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 replacing sensor, go to step 13).
  11. Repair as necessary. After repairs, go to step 13).
  12. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  13. 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).
  14. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
scientia non olet · About LEMON Manuals