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Home >> Chevrolet >> 2000 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0243: Supercharger Boost Solenoid Control Circuit (BONNEVILLE, Grand PRIX, Park Avenue & Regal - VIN 1) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and boost control solenoid control circuit at PCM harness connector. If voltage is near battery voltage, go to next step. If voltage is not as specified, go to step  6.
  3. Using DVOM set to measure current, monitor current for 2 minutes between ground and boost control solenoid control circuit at PCM harness connector. If current remains 0.05-0.08 amp, go to step  11. If current does not remain 0.05-0.08 amp, go to next step.
  4. Turn ignition off. Disconnect boost control solenoid. Turn ignition on. Check for voltage between ground and boost control solenoid control circuit. If voltage is not present, go to step  10. If voltage is present, go to next step.
  5. Repair short to voltage in boost control solenoid control circuit. After repairs, go to step  16.
  6. Turn ignition off. Check fuse supplying ignition voltage to boost control solenoid. If fuse is open, go to next step. If fuse is okay, go to step  8.
  7. Repair short to ground in ignition feed circuit to boost control solenoid. After repairs, go to step  16.
  8. Disconnect boost control solenoid. Turn ignition on. Measure voltage between ground and boost control solenoid ignition feed circuit. If voltage is near battery voltage, go to next step. If voltage is not as specified, go to step  13.
  9. Check boost control solenoid control circuit for an open or short to ground. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to next step.
  10. Check boost control solenoid control circuit for poor connections at PCM and solenoid. Check boost control solenoid ignition feed circuit for poor connection at solenoid. Repair as necessary. After repairs, go to step  16. If connections are okay, go to step  14.
  11. Turn ignition off. Reconnect PCM. Disconnect boost control solenoid. Turn ignition on. Connect test light between boost control solenoid control circuit and ignition feed circuit at harness connector. Using scan tool, command boost control solenoid on and off. If test light flashes, see DIAGNOSTIC AIDS . If test light does not flash, go to next step.
  12. Check boost control solenoid control circuit for poor connection at PCM. Repair as necessary. After repairs, go to step  16. If connection is okay, go to step  15.
  13. Repair open in ignition feed circuit to boost control solenoid. After repairs, go to step  16.
  14. Replace boost control solenoid. After repairs, go to step  16.
  15. Replace PCM. Program replacement PCM using required equipment. After repairs, go to next step.
  16. Using scan tool, review and record FAILURE RECORDS data. Clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, system is okay. If scan tool does not indicate that this test ran and passed, go to step  2.
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