Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1986 Buick Riviera BaseFACTORY OEM SERVICE PROCEDURE
BCM System, Part I
- Description
- Operation
- Testing - Preliminary Information
- Self-Diagnostic System
- Component Locations
- Identification
- TORONADO Diagnostic Charts
- Notes
- Service Diagnostics Check
- Chart A-1, TORONADO, No "Service Engine Soon" Light
- Chart A-2, TORONADO, "Service Engine Soon" Light On
- Chart B-1, TORONADO, Loss Of Serial Data
- Chart B-2, TORONADO, Loss Of IPC Display
- Chart B-2A, TORONADO, Cps Check
- Chart B-3, TORONADO, Loss Of Serial Data
- Chart B-4, TORONADO, Grounded Serial Data Circuit
- Chart B-5, TORONADO, Double Open In Serial Data Circuit
- Chart B-5A, TORONADO, Open In Serial Data Circuit
- Chart B-6, TORONADO, Serial Data Shorted To Voltage
- Chart C-1, TORONADO, Loss Of ECC Communications
- Chart C-2, TORONADO, Diagnostics Cannot Be Entered
- Riviera Diagnostic Charts
- Notes
- Self-Diagnostics System Check (Riviera)
- Chart A-1, No "Service Engine Soon" Light (Riviera)
- Chart A-2, Loss Of Cps 12 Volts (Riviera)
- Chart B-1, Cannot Access Diagnostics (Riviera)
- Chart B-2, Data Problem (Riviera)
- Chart B-3, No Communication Riviera
- Chart B-4, No Communication Riviera
- Chart B-5, CRTC Problem (Riviera)
- Chart B-6, CRTC Problem (Riviera)
- Chart B-7, Blank CRT & No Communication To IPC (Riviera)
- Chart B-8, No Communication To IPC W/ Only Radio Function
- Chart B-9, BCM Problem (Riviera)
- Chart B-10, Loss Of Logic -7 Volt (Riviera)
- Chart C-1, CRT Problem (Riviera)
- Chart C-2, No Picture (Riviera)
- Chart C-3, No Switch Responds Or Beeper Problem (Riviera)
- Chart C-4, Some Switches Do Not Respond (Riviera)
- Chart C-5, Picture Rolls (Riviera)
- ECM Trouble Code Charts
- Code EO13, Open Oxygen Sensor Circuit
- Code EO14, Coolant Sensor Temperature Too High
- Code EO15, Coolant Sensor Temperature Too Low
- Code EO16, System Voltage Out Of Range
- Code EO21, TPS Signal Voltage High
- Code EO22, TPS Signal Voltage Low
- Code EO24, Vehicle Speed Sensor (VSS) Circuit
- Code EO29, 4TH Gear Switch Circuit Inoperative (Open)
- Code EO32, EGR System Fault
- Code EO33, Mass Airflow (MAF) Sensor Voltage High
- Code EO34, Mass Airflow (MAF) Sensor Voltage Low
- Code EO37, Manifold Air Temperature (Mat) Sensor Too High
- Code EO38, Manifold Air Temperature (Mat) Sensor Too Low
- Code EO40, Open Power Steering Pressure Switch Circuit
- Code EO41, C(3)I Ignition Cam Sensor
- Code EO42, C(3)I Ignition System
- Code EO43, Electronic Spark Control (ESC) System
- Code EO44, Lean Exhaust Indication
- Code EO45, Rich Exhaust Indication
- Code EO47, ECM-BCM Data
- Code EO51, Prom Error
- Code EO52, CALPAK Error
- Code EO55, ECM Error
- Wiring Diagrams
Factory Service Tools
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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.
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