SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 7.4LDIAGNOSTIC TROUBLE CODESDTC P0339 - CRANKSHAFT POSITION SENSOR CIRCUIT INTERMITTENTDIAGNOSTIC PROCEDURES
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Diagnostic Procedures

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Diagnostic Procedures
  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.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.