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HOMESERVICE MANUALSBUICK1996ROADMASTER BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEMS - TESTS W/CODESDIAGNOSTIC TROUBLE CODESDTC P1415 - AIR SYSTEM BANK 1DIAGNOSTIC 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. Start and operate engine to "closed loop" status. Turn off all accessories. Using scan tool, select ENGINE 1 DATA LIST and monitor Bank 1 HO2S 1 voltage display. If HO2S voltage drops to less than 350 mV, see DIAGNOSTIC AIDS. If HO2S voltage does not drop to less than 350 mV, go to next step.
  3. Ensure all hoses and pipes are connected and clamps secure. Check for heat damaged components. Repair as necessary. After repairs, go to step 6). If components are okay, go to next step.
  4. Disconnect hose from check valve at left exhaust manifold. Using scan tool, enable AIR pump. If air is present at hose outlet, go to step 7). If air is not present, go to next step.
  5. Repair restriction or blockage in AIR hoses/pipes between left exhaust manifold and where system branches to both sides of engine. After repairs, go to step 8).
  6. Repair as necessary. After repairs, go to step 8).
  7. Replace check valve. After replacing check valve, go to next step.
  8. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P1415. 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).
  9. 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.