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 MANUALSGMC1984S15 JIMMY 2.8 B, RWD, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFEEDBACK CARBURETOR TESTS W/CODES
1984 GMC S15 Jimmy 2.8 B, RWD, Automatic
Feedback Carburetor Tests W/Codes
1984 GMC S15 Jimmy 2.8 B, RWD, AutomaticSECTION Feedback Carburetor Tests W/Codes
- Description
- Diagnosis
- Basic Diagnostic Procedure
- Entering Or Exiting Diagnostic Mode
- Clearing Trouble Codes
- Reading Trouble Codes
- ECM Trouble Code Identification
- Trouble Code Determination (Hard Or Intermittent)
- Diagnostic Materials
- Diagnostic Tools
- Diagnostic Circuit Check - All Except 4.1L
- Diagnostic Circuit Check - 4.1L Only
- System Performance Check
- Chart A-1, Dwell Fixed Under 10°
- Chart A-2, Dwell Fixed Between 10°-50°
- Chart A-3, Dwell Fixed Over 50°
- Chart A-5, "Check Engine" Light Inoperative
- Chart A-6, Won't Flash Code 12
- Code 12, No Distributor Reference Pulses
- Code 13 - Oxygen Sensor Circuit
- Code 14 - Coolant Sensor Shorted
- Code 15 - Coolant Sensor Open
- Code 21 - TPS Circuit High
- Code 23 - M/C Solenoid Circuit Low
- Code 34 - Differential Pressure (Vacuum) Sensor
- Code 41 - No Distributor Reference Signal
- Code 42 - Electronic Spark Timing (Est)
- Code 44 - Lean Exhaust Indication
- Code 45 - Rich Exhaust Indication
- Code 51 - Prom
- Code 54 - M/C Solenoid Circuit High
- Code 55, High Voltage On O2 Sensor Circuit Or Wrong Voltage
- Chart C1 - ECM Replacement Check Chart
- Electronic Control Module (ECM)
- Programmable Read Only Memory (Prom)
- Oxygen Sensor
- Throttle Position Sensor (TPS)
- All Other Sensors, Solenoids & Switches
- 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.