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 MANUALSISUZU1990AMIGO S, 2.3 L, MSG5EREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFI
1990 Isuzu Amigo S, 2.3 L, MSG5E
Engine Controls - System/Component Tests - EFI
1990 Isuzu Amigo S, 2.3 L, MSG5ESECTION Engine Controls - System/Component Tests - EFI
- Introduction
- Circuits
- Sensors
- Airflow Sensor Test (Amigo, Pickup & Trooper 2.6L)
- Coolant Temperature Sensor Test
- Crank Angle Sensor Test (Amigo/Impulse/Pickup/Trooper 2.6L)
- Crank Signal Test (Trooper 2.8L)
- EGR Temperature Sensor Test
- Knock Sensor Test (Trooper 2.8L)
- Map Sensor Test (Impulse & Trooper 2.8L)
- Manifold Air Temperature (Mat) Sensor Test (Impulse)
- Oxygen (O2) Sensor Test
- TPS Test (Impulse & Trooper 2.8L)
- Throttle Position Sensor (TPS) Test (Trooper 2.6L A/T)
- TVS Test (Amigo, Pickup & Trooper 2.6L)
- Vehicle Speed Sensor (VSS) Test (Amigo & Pickup)
- Vehicle Speed Sensor Test (Impulse & Trooper)
- Relays & Switches
- Park/Neutral Switch Test (Amigo & Pickup
- Chart C-1A: Park/Neutral Switch Relay (Impulse)
- Power Steering Pressure Switch Test (Impulse)
- Fuel Pump Relay Test (Amigo & Pickup 2.6L)
- Fuel Pump Relay Test (Impulse)
- Fuel Pump Relay Test (Trooper 2.6L)
- Fuel Pump Relay Test (Trooper 2.8L)
- Fuel Pump Back-Up Relay Test (Trooper 2.8L)
- Main Relay Test (Amigo & Pickup 2.6L)
- Main Relay Test (Impulse)
- Main Relay Test (Trooper 2.6L)
- Main Relay Test (Trooper 2.8L)
- Solenoids
- Motors
- Modules
- Fuel System
- Fuel Delivery
- Pressure Regulator (Amigo, Impulse, Pickup & Trooper 2.6L)
- Pressure Regulator Vacuum Switching Valve (VSV) (Amigo, Pickup & Trooper 2.6L)
- Dropping Resistor (Amigo, Pickup & Trooper 2.6L)
- Fuel-Cut (Slow-Cut) System (Amigo, Pickup & Trooper 2.6L)
- Fuel Injectors (Amigo, Pickup & Trooper 2.6L)
- Fuel Injectors (Impulse & Trooper 2.8L)
- Fuel Injector Balance Test (Impulse)
- Idle Control System
- Ignition System
- Emission Systems & Sub-Systems
- Air Management Valve (Amigo & Pickup)
- Air Switching Valve (Trooper 2.6L)
- Chart C-6: Air Management System (Trooper 2.8L)
- Check Valve (Amigo, Pickup & Trooper)
- Air Switching Valve Vacuum Switching Valve (VSV) (Trooper 2.6L)
- Exhaust Gas RECIRCULATION
- Backpressure Transducer (BPT), (Amigo & Pickup, Fed. Only & Trooper 2.6L)
- Duty Solenoid (Amigo & Pickup Calif. Only)
- EGR Control Module (Trooper 2.8L)
- EGR System (Amigo & Pickup (Fed. Only) & Trooper 2.6L)
- EGR System (Amigo & Pickup Calif. Only)
- Chart C-7A: EGR System (Impulse)
- EGR System (Trooper 2.8L)
- EGR Temperature Sensor (Amigo, Pickup & Trooper 2.6L)
- EGR Transducer (Impulse)
- EGR Valve
- EGR Vacuum Switching Valve (VSV) (Amigo & Pickup Calif. Only)
- EGR Vacuum Switching Valve (VSV), (Impulse)
- Thermal Vacuum Valve (TVV) (Amigo & Pickup, Fed. Only & Trooper 2.6L)
- Evaporative Emission System (EVAP) (Amigo, Pickup & Trooper 2.6L)
- Miscellaneous Controls
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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.