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 MANUALSISUZU1986PICKUP BASE, 2D PICKUP, 1.9 A, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFEEDBACK CARBURETOR SYSTEM
1986 Isuzu Pickup Base, 2D Pickup, 1.9 A, 4WD
Feedback Carburetor System
1986 Isuzu Pickup Base, 2D Pickup, 1.9 A, 4WDSECTION Feedback Carburetor System
- Description
- Operation
- Diagnosis & Testing
- Diagnostic System
- Trouble Codes
- Diagnostic Procedure
- Diagnostic Circuit Check
- Driver Complaint
- System Performance Check
- Chart 1, Dwell Fixed Under 10°
- Chart 2, Dwell Fixed Between 10-80° Open Coolant Sensor Or Oxygen Sensor Circuit
- Chart 3, Dwell Fixed Over 80° Rich Condition Indication
- Chart 4, Idle Switch & Wot SW. Circuit Check
- Chart 5, "Check Engine" Light Inoperative
- Chart 6, No Code 12
- Code 12, No Reference Pulses To ECM
- Code 13 - Open O2 Sensor Circuit
- Code 14 - Shorted Coolant Sensor Circuit
- Code 15 - Open Coolant Sensor Circuit
- Code 21 - Idle Switch Circuit Open Or Wot Switch Circuit Shorted
- Code 22 - Fuel Cut (F/C) Solenoid Circuit Open Or Grounded
- Code 23 - Mixture Control (M/C) Solenoid Circuit Open Or Grounded
- Code 31 - No Reference Signal
- Code 25 - Air Switching (A/S) Solenoid Circuit Open Or Grounded
- Code 44 - Oxygen (O2) Sensor - Lean Indication
- Code 45 - Oxygen (O2) Sensor - Rich Indication
- Code 51 - Constant High Voltage From Fuel Cut Solenoid To ECM
- Code 52 - Ram Problem
- Code 53 - Constant High Voltage From A/S Solenoid To ECM
- Code 54 - Constant High Voltage From Mixture Solenoid To ECM
- Idle/Wot Switch Assemblies Check
- Code 55 - A/C Converter Problem
- Air Management Check
- Carburetor Mixture Control (M/C) Solenoid Check
- Removal & Installation
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.