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 MANUALSGMC1983S15 JIMMY 1.9 A, RWD, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM1.9L CEC TESTS W/CODES
1983 GMC S15 Jimmy 1.9 A, RWD, Automatic
1.9L CEC Tests W/Codes
1983 GMC S15 Jimmy 1.9 A, RWD, AutomaticSECTION 1.9L CEC Tests W/Codes
- Diagnosis & Testing
- Entering Diagnostic Mode
- Trouble Code Id Menu
- Clearing Trouble Codes
- Exiting Diagnostic Mode
- Diagnostic Circuit Check
- Driver Comments
- System Performance Check
- Tools Required
- Diagnostic Procedure Chart
- Driver Complaints
- Chart 1 - Dwell Fixed Under 10°
- Chart 2 - Dwell Fixed Between 10 - 80°
- Chart 3 - Dwell Fixed Over 80°
- Chart 4 - Idle Switch & Wot Switch
- Chart 5 - No "Check Engine" Light
- Chart 6 - No Code 12
- Code 12 - No Reference Signal To ECM
- Code 13 - Open O Sensor
- Code 14 - Shorted Cts Circuit
- Code 15 - Open Cts Circuit
- Code 21 - Idle/Wot Switch
- Code 22 - Fuel Cut Solenoid
- Code 23 - Vacuum Control Solenoid
- Code 25 - Air Switching Solenoid
- Code 31 - No Reference Signal To ECM
- Code 44 - Lean O2 Sensor Indication
- Code 45 - Rich O2 Sensor Indication
- Code 51 - Shorted Fuel Cut Solenoid
- Code 52 - Faulty ECM (Ram Error)
- Code 53 - Shorted Air Switching Solenoid/ECM
- Code 54 - Shorted Vacuum Control Solenoid
- Code 55 - Faulty ECM
- Air Management Check
- Idle & Wot Switch ASM. Check
- Vacuum Control Valve Check
- Component Testing
- Removal & Installation
- Wiring Diagram
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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.