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.
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HOMESERVICE MANUALSPONTIAC19916000 SEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS
1991 Pontiac 6000 SE
Engine Controls - System/Component Tests
1991 Pontiac 6000 SESECTION Engine Controls - System/Component Tests
- Introduction
- General Motors A & C Chart Reference
- Computerized Engine Controls
- Engine Sensors & Switches
- Notes
- Engine Controls - System/Component Tests
- A/C ON (A/C Request) Switch Test
- A/C Pressure Sensor (All 2.3L & 3.1L J & W Bodies)
- A/C Pressure Switch
- Brake Switch
- Camshaft Sensor (3.8L VIN C)
- Camshaft Sensor (Cadillac Except Brougham)
- Coolant Temperature Sensor (CTS)
- Crankshaft Position Sensor (2.3L IDI)
- Crankshaft Position Sensor (DIS)
- Dual Crank (Combination) Sensor (3.3L C(3)I System)
- Engine Oil Temperature Sensor (Corvette)
- Hall Effect Camshaft Sensor (Cadillac Except Brougham)
- Knock Sensor
- Manifold Absolute Pressure (MAP) Sensor (C-1)
- Manifold Air Temperature (MAT) Sensor
- Mass Airflow Sensor (3.3L & 3.8L)
- Oxygen (O2) Sensor
- Park/Neutral (P/N) Switch (C-1)
- Power Steering (P/S) Pressure Switch (C-1)
- Throttle Position Sensor (TPS)
- Vehicle Speed Sensor (PM Generator Type)
- Vehicle Speed Sensor (LED Type)
- Motors, Relays & Solenoids
- Fuel System
- Idle Control System (C-2)
- Ignition System (Exc. C3I)
- Ignition System (C3I)
- Emission Systems & Sub-Systems
- Miscellaneous Controls
- Component Locations
RENDER: 1.0x
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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.