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 MANUALSISUZU1987PICKUP BASE, 2D PICKUP, 1.9 A, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFEEDBACK CARBURETOR SYSTEM
1987 Isuzu Pickup Base, 2D Pickup, 1.9 A, 4WD
Feedback Carburetor System
1987 Isuzu Pickup Base, 2D Pickup, 1.9 A, 4WDSECTION Feedback Carburetor System
- Description
- Operation
- Diagnosis & Testing
- Test Charts
- 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 10° Rich Condition Indication
- Chart 4, Idle Switch & Wot SW. Circuit Check
- Chart 5, "Check Engine" Light Inoperative
- Chart 6, Won't Flash Code 12
- Chart 7, Trouble Code 12 No Reference Pulses To ECM
- Chart 8, Trouble Code 13 Open Oxygen Sensor Circuit
- Chart 9, Trouble Code 14 Shorted Coolant Sensor Circuit
- Chart 10, Trouble Code 21 Idle Switch Circuit Open Or Wot Switch Circuit Shorted
- Chart 11, Trouble Code 15 Open Coolant Sensor Circuit
- Chart 12, Trouble Code 22 Fuel Cut (F/C) Solenoid Circuit Open Or Grounded
- Chart 13, Trouble Code 23 Mixture Control (M/C) Solenoid Circuit Open Or Grounded
- Chart 14, Trouble Code 31 No Reference Signal
- Chart 15, Trouble Code 25 Air Switching (A/S) Solenoid Circuit Open Or Grounded
- Chart 16, Trouble Code 44 Oxygen Sensor - Lean Indication
- Chart 17, Trouble Code 45 Oxygen Sensor - Rich Indication
- Chart 18, Trouble Code 51 Constant High Voltage From Fuel Cut (F/C) Solenoid To ECM
- Chart 19, Trouble Code 52 Ram Problem
- Chart 20, Trouble Code 53 Constant High Voltage From Air Switching (A/S) Solenoid To ECM
- Chart 21, Trouble Code 54 Constant High Voltage From Mixture (M/C) Solenoid To ECM
- Chart 22, Idle Switch & Wot Switch ASSY. Check
- Chart 23, Trouble Code 55 A/D Converter Problem
- Chart 24, Air Management Check
- Chart 25, Carburetor Mixture Control M/C) Solenoid Check
- Removal & Installation
- Wiring Diagrams
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.