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.
1988 Isuzu Trooper II Base, StandardFACTORY OEM SERVICE PROCEDURE
I-TEC Control System
- Description
- Operation
- Diagnosis & Testing
- Ecu Trouble Codes
- Ecu Code 12 - No Ignition
- Ecu Code 13 - Oxygen Sensor Circuit
- Ecu Code 14 - Coolant Sensor Circuit
- Ecu Codes 15 & 16 - Coolant Sensor Circuit
- Ecu Codes 21, 43 & 65 - Throttle Position Sensor
- Ecu Code 22 - Starter Signal Circuit
- Ecu Codes 23, 35 & 54 - Ignition Circuit
- Ecu Codes 25 & 53 - Vacuum Switching Circuit
- Ecu Codes 26 & 27 - Canister Purge Vacuum Switching Valve
- Ecu Code 32 - EGR System
- Ecu Code 33 - Fuel Injector Circuit
- Ecu Code 34 - EGR Gas Temperature Sensor
- Ecu Code 41 - Crank Angle Sensor Circuit
- Ecu Codes 44 & 45 - Oxygen Sensor Circuit
- Ecu Codes 51, 52 & 55 - Ecu Fault
- Ecu Codes 61 & 62 - Airflow Sensor Circuit
- Ecu Code 63 - Vehicle Speed Sensor
- Ecu Code 64 - Fuel Injector Transistor
- Ecu Code 66 (Impulse) - Knock Sensor Circuit
- Ecu Code 71 - Throttle Position Sensor
- Ecu Codes 72 & 73 - EGR Vacuum Switching Valve
- TCU Trouble Codes
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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