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HOMESERVICE MANUALSCHEVROLET1999CHEVY EXPRESS G1500, VAN CARGO, 5.7 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0205-P0351DTC P0335DTC P0335: CRANKSHAFT POSITION SENSOR "A" CIRCUIT (3.5L "W" BODY)DIAGNOSTIC PROCEDURES
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 R

Diagnostic Procedures

1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 RSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Using scan tool, check if DTC P0340 is also set. If DTC P0340 is set, diagnose DTC P0340. If DTC P0340 is not set, go to next step.
  3. Start and operate engine. If engine starts, go to next step. If engine does not start, go to step  6.
  4. Using scan tool, select CKP SENSOR STATUS. Start engine. If scan tool indicates CKP sensor status angle, go to next step. If scan tool does not indicate CKP sensor status angle, go to step  6.
  5. Wiggle related harnesses and connectors while monitoring scan tool display. If scan tool indicates that CKP sensor status changes from Time "A" or Time "B", or engine stalls, go to step  13. If scan tool does not indicate that CKP sensor status changed or engine did not stall, problem is intermittent.
  6. This step applies to the senor and related circuit that is malfunctioning. For example, if scan tool indicates Time "A", the system is using the signal from CKP sensor "A". Diagnose CKP sensor "B" and related circuits. To diagnose, turn ignition off. Disconnect affected CKP sensor harness connector. Using DVOM, check voltage on power circuit at CKP sensor harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  14.
  7. Check voltage between power circuit and ignition circuit at CKP sensor harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  15.
  8. Turn ignition off and wait 15 seconds. Turn ignition on. Using scan tool, clear DTCs. Using scan tool, command system to operate in appropriate Time mode for sensor being tested. Monitor 24X crank sensor data. Using a test light connected to battery voltage, momentarily touch signal circuit several times. If RPM is indicated on scan tool, go to step  20. If RPM is not indicated, go to next step.
  9. Turn ignition off. Disconnect PCM harness connector C1. Turn ignition on. Check voltage on CKP sensor signal circuit on PCM harness connector. If voltage is indicated, go to step  18. If voltage is not indicated, go to next step.
  10. Using DVOM, check signal circuit resistance between CKP harness connector and PCM harness connector. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step  16.
  11. Check resistance between ground and signal circuit. If resistance is infinite, go to next step. If resistance is not infinite, go to step  17.
  12. Check resistance between CKP sensor "A" and "B" signal circuits. If resistance is infinite, go to step  22. If resistance is not infinite, go to step  19.
  13. Repair harness or connections as necessary. After repairs, go to step  24.
  14. Repair open/high resistance power circuit between sensor and splice. After repairs, go to step  24.
  15. Repair open/high resistance ground circuit between sensor and splice. After repairs, go to step  24.
  16. Repair open/high resistance in sensor signal circuit. After repairs, go to step  24.
  17. Repair sensor signal circuit shorted to ground. After repairs, go to step  24.
  18. Repair sensor signal circuit shorted to power. After repairs, go to step  24.
  19. Repair signal circuits shorted together. After repairs, go to step  24.
  20. Check for poor connections/terminal tension at CKP sensor. Repair as necessary. After repairs, go to step  24. If connections are okay, go to next step.
  21. Replace CKP sensor. After replacing sensor, go to step  24.
  22. Check for poor connections/terminal tension at PCM harness connector. Repair as necessary. After repairs, go to step  24. If connections are okay, go to next step.
  23. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  24. Using scan tool, clear DTCs. Turn ignition off. Wait 15 seconds, then operate vehicle within conditions required to set 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, go to step  2.
  25. Using scan tool, select CAPTURE INFO function. If any undiagnosed DTCs 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.