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HOMESERVICE MANUALSBUICK1996ROADMASTER BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEMS - TESTS W/CODESDIAGNOSTIC TROUBLE CODESDTC P0335 - CRANKSHAFT POSITION SENSOR CIRCUITDIAGNOSTIC PROCEDURES
1996 Buick Roadmaster Base

Diagnostic Procedures

1996 Buick Roadmaster BaseSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. If DTC P1371 or P1373 is also present, diagnose affected DTC first. If DTC(s) are not present, go to next step.
  3. Start engine. Using scan tool, monitor CRANKSHAFT RPM. If RPM is indicated, go to next step. If RPM is not indicated, go to step 9).
  4. Using scan tool, monitor CKP:LO RES ANGLE. Actual value may fluctuate, but should remain within the range. If value is within range of -10° Dev. to +7° Dev, go to step 7). If value is not within range, go to next step.
  5. While observing CKP:LO RES ANGLE, quickly increase engine RPM once and allow to return to idle. If range changes from a positive value on acceleration to a negative value on deceleration, go to step 15). If value does not change, go to next step.
  6. If value is fixed or out of range, go to step 16). If value is as specified, go to next step.
  7. Using scan tool, select MISFIRE DATA LIST and monitor CYL MODE MISFIRE INDEX with engine at idle. Misfire index value should read 1000. If value is not as specified, go to next step. If value is as specified, go to step 12).
  8. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data and note parameters. Turn ignition off for about 15 seconds. Start engine and operate vehicle within the conditions required for this diagnostic to run, and as close to conditions recorded in FREEZE FRAME/FAILURE RECORDS as possible. Select DTC function then enter DTC P0335. If scan tool indicates that this test failed this ignition, go to next step. If scan tool does not indicate that this test failed this ignition, see DIAGNOSTIC AIDS.
  9. Turn ignition on, with engine off. Disconnect CKP sensor harness connector. Connect a test light between CKP sensor ignition feed circuit to battery ground at harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 17).
  10. Connect test light between CKP sensor harness connector terminals "A" and "B". If test light illuminates, go to next step. If test light does not illuminate, go to step 19).
  11. Install Signal Generator Tester (J 33431-B) to CKP sensor harness connector and ground. Turn ignition on. Turn tester on and set to generate a 54 MPH signal. Using scan tool, monitor crankshaft RPM. If scan tool indicates crankshaft RPM is present, go to step 17). If crankshaft RPM is not indicated, go to step 13).
  12. Visually inspect CKP sensor for physical damage, loose or improper installation, wiring routed too close to secondary ignition components or poor connections/terminal contact at sensor or PCM. Repair as necessary. After repairs, go step 23). If components or circuits are okay, go to step 21).
  13. Turn ignition off. Disconnect PCM harness connector C1. Using DVOM, check continuity to signal circuit from sensor harness connector to PCM connector. If continuity is present, go to next step. If continuity is not present, go to step 20).
  14. Using DVOM, check resistance between signal circuit and ground. If infinite resistance is present, go to step 22). If infinite resistance is not present, go to step 20).
  15. Check excessive timing gear/chain wear. Repair as necessary. After repairs, go to step 23).
  16. Check for poor connections/terminal at CKP sensor or for proper reluctor wheel installation. Repair as necessary. After repairs, go to step 23).
  17. Check for poor connections/terminal tension at CKP sensor. Repair as necessary. After repairs, go to step 23). If connection or terminal tension is okay, go to step 21).
  18. Repair ignition feed circuit. After repairs, go to step 23).
  19. Repair ground circuit. After repairs, go to step 23).
  20. Repair signal circuit. After repairs, go to step 23).
  21. Replace CKP sensor. After replacing sensor, go to step 23).
  22. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  23. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0335. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool did not indicate that this test ran and passed, repeat step 2).
  24. Using scan tool, select CAPTURE INFO, REVIEW INFO function. 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.