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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0335 - Crankshaft Position Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
  2. Attempt to start engine. If engine starts and runs, problem is intermittent. See DIAGNOSTIC AIDS. If engine does not start, go to next step.
  3. Turn ignition off. Disconnect CKP sensor connector. Turn ignition on, with engine off. Using DVOM, measure voltage between ground and CKP sensor harness connector signal circuit (ECM side). If voltage is 0.5-1.5 volts, go to step 6). If voltage is not 0.5-1.5 volts, go to next step.
  4. Turn ignition off. Disconnect ECM harness connector located in engine compartment relay center. Using DVOM, check harness continuity of CKP sensor signal circuit. If continuity is present, go to next step. If continuity is not present, go to step 10).
  5. Using DVOM, check harness continuity between ground and CKP sensor signal circuit. If continuity is present, go to step 9). If continuity is not present, go to step 14).
  6. Using test light connected to battery voltage, probe CKP sensor harness connector ground circuit (ECM side). If test light is on, go to step 8). If test light is off, go to next step.
  7. Turn ignition off. Disconnect ECM harness connector located in engine compartment relay center. Using DVOM, check harness continuity of CKP sensor ground circuit. If continuity is present, go to step 14). If continuity is not present, go to step 11).
  8. Disconnect main fuel injector connector. Connect Signal Generator Tester (J-33431-B) to CKP sensor harness connector (ECM side). Using scan tool, monitor engine RPM. If RPM is indicated on scan tool, go to step 12). If RPM is not indicated on scan tool, go to step 15).
  9. Repair short to ground in signal circuit. After repairs, go to step 16).
  10. Repair open or high resistance in signal circuit. After repairs, go to step 16).
  11. Repair open or high resistance in ground circuit. After repairs, go to step 16).
  12. Check for poor connection and terminal tension at CKP sensor connector. Check sensor for proper installation. A sensor that is loose or not fully seated could cause an excessive air gap between sensor and reluctor wheel. Repair as necessary. After repairs, go to step 16). If connections and terminals are okay, go to next step.
  13. Replace CKP sensor. After replacing sensor, go to step 16).
  14. Check for poor connections and terminal tension at ECM connectors. Repair as necessary. After repairs, go to step 16). If connections and terminals are okay, go to next step.
  15. Replace ECM. New ECM must be programmed with theft deterrent module frequency code currently on vehicle. After replacing ECM, go to next step.
  16. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and operate vehicle. Check for DTCs. If DTC P0335 is set, go to step 2). If DTC P0335 is not set, go to next step.
  17. If other DTCs were present during OBD system check and have not been diagnosed, go to applicable DTC. If no other DTCs are present, system is okay.
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