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.
1991 Isuzu Rodeo LS, RWD, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - System/Component Tests - EFI
- Introduction
- Computerized Engine Controls
- Engine Sensors & Switches
- Relays, Solenoids, Motors & Modules
- Fuel System
- Idle Control System
- Ignition System
- Emission Systems & Sub-Systems
- Air Injection
- Exhaust Gas RECIRCULATION (EGR)
- Backpressure Transducer (BPT) (Amigo & Pickup 2.6L - Federal; Rodeo & Trooper 2.6L)
- Duty Solenoid (Amigo & Pickup 2.6L - California)
- EGR Control Module (Trooper 2.8L)
- EGR System (Amigo & Pickup 2.6L - Federal; Rodeo & Trooper (2.6L)
- EGR System (Amigo & Pickup 2.6L - California)
- EGR System (Trooper 2.8L)
- EGR Temperature Sensor (Amigo & Pickup 2.6L - Federal; Rodeo & Trooper 2.6L)
- EGR Vacuum Switching Valve (VSV) (Amigo & Pickup 2.6L Calif)
- EGR Vacuum Switching Valve (VSV) (Rodeo 2.6L)
- EGR Valve
- Thermal Vacuum Valve (TVV) (Amigo & Pickup 2.6L - Federal; Rodeo & Trooper 2.6L)
- Evaporative Emission System (EVAP)
- Positive Crankcase Ventilation (PCV)
- Thermostatic Air Cleaner (TAC)
- Miscellaneous Controls
- Diagnostic Charts
- Chart C-1B, Crank Signal (P/U & Rodeo 3.1L; Trooper 2.8L)
- Chart C-1D, Map Sensor Output
- Chart C-2C, Idle Air Control Valve
- Chart C-5, ESC System (Pickup And Rodeo 3.1L)
- Chart C-5, ESC System (Trooper 2.8L)
- Chart C-6, Air Management System (2.8L)
- Chart C-7, EGR System (2.8L)
- Chart C-10, A/C Clutch Control Diagnosis (2.8L)
- Chart C-10, A/C Clutch Control Diagnosis (3.1L)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.