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 MANUALSPONTIAC1983GRAND PRIX BASE, 5.0 HREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (FEEDBACK CARBURETOR TESTS W/CODES)
1983 Pontiac Grand Prix Base, 5.0 H
Section 11 (Feedback Carburetor Tests W/Codes)
1983 Pontiac Grand Prix Base, 5.0 HSECTION Section 11 (Feedback Carburetor Tests W/Codes)
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 1984 Pontiac Phoenix, 1984 Pontiac Parisienne, 1984 Pontiac Grand Prix, 1984 Pontiac Firebird, and 1984 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnosis & Testing
- Entering/Exiting Diagnostic Mode
- Clearing Trouble Codes
- Reading Trouble Codes
- ECM Trouble Code Id
- Trouble Code Determination (Hard Or Intermittent)
- Diagnostic Chart Information
- Diagnostic Circuit Check
- Diagnostic Symptom Check
- System Performance Check (CARBURETED Models Only)
- Diagnostic Tools
- System Performance Check
- Chart A1: Dwell Fixed Under 10° Test
- Chart A2: Dwell Fixed Between 10-50° Test
- Chart A3: Dwell Fixed Over 50° Test
- Chart A5: "Check Engine" Light Inoperative Test
- Chart A6: Won't Flash Code 12 Test
- Code 12: No Reference Pulses From Distributor
- Code 13: Open O2 Sensor Circuit
- Code 14: Coolant Temp Sensor (Cts) Shorted
- Code 15: Coolant Temp Sensor (Cts) Open
- Code 21: TPS Circuit High
- Code 22 - TPS Circuit Low (5.0L VIN Y Only)
- Code 23: Mixture Control (M/C) Solenoid CKT Low
- Code 24: Vehicle Speed Sensor (VSS) (W/Digital Cluster)
- Code 24: Vehicle Speed Sensor (VSS) (Integral Buffer)
- Chart 24B: Park/Neutral (P/N) Circuit
- Code 32: BARO Sensor Voltage Low
- Code 34: Differential Pressure (Vacuum) Sensor
- Code 34: Map Sensor Circuit
- Code 35: Idle Speed Control Circuit
- Code 41: No Distributor Reference Signal
- Code 42: Electronic Spark Timing (Est)
- Code 43: Electronic Spark Control (ESC)
- Code 44: Lean Exhaust Indication
- Code 45: Rich Exhaust Indication
- Code 51: Faulty Prom
- Code 53: EGR Vacuum Control
- Code 54: Mixture Control (M/C) Solenoid CKT High
- Chart C1 - ECM Replacement Check Chart
- Chart C-1D: Map & BARO Output Check
- Chart C-1E: Differential Pressure Sensor (Vac) Check
- Chart C-2A: Idle Speed Control (ISC) Check
- Chart C-2B: Idle Speed Solenoid (5.0L VIN H & G; 5.7L VIN 6)
- Chart C-2C: Idle Load COMPENSATOR (5.0L VIN Y)
- Chart C-2D: Rear Vacuum Brake Check (5.0L VIN Y, 9)
- Chart C-2E-1 & 2: Idle Speed Solenoid (2.8L)
- Chart C-2F: TPS Enrichment Check
- Chart C-3: Canister Purge Valve Check
- Chart C-4A: Ignition System Check (W/Integral Coil)
- Chart C-4B: Ignition System Check (W/Remote Coil)
- Chart C-4C: Est Performance Check
- Chart C-5: Electronic Spark Control Check
- Chart C-6A: Air Management Check
- Chart C-7A: Pulse Width Modulated EGR Valve Check
- Chart C-7B: EGR Valve Check
- Chart C-8A-1: TCC Check
- Chart C-8A-2: TCC Check
- Chart C-9A: EFE Check (Electrically Heated)
- Chart C-9C: EFE Check (Vacuum Servo W/TVS)
- Chart C-9D: Electric EFE Check (Non-ECM Controlled)
- Chart C-10A: A/C Constant Run Relay Check (3.0L A Series)
- Chart C-10B: A/C Wot Relay Check (3.0L A Series)
- Chart C-10C: A/C Cut-Out Relay Check (5.0L VIN 9 & Y)
- Chart C-10D: A/C Wot Relay Check (All Others)
- Chart C-12A-1: Coolant Fan Functional Check
- Chart C-12A-2: Coolant Fan No Lo Speed Check
- Chart C-12A-3: Coolant Fan No Hi Speed Check
- ECM Terminal Id
- Wiring Diagrams
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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.