Isuzu Trooper 4JX1 (2003)❗ error codes❗ usually mean — these are OBD/ECU diagnostic codes specific to the 4JX1 diesel engine (common rail type): ❗Code 22 ❗Cose 74 ❗Code 66 ⚠️ Error Code 22 – Throttle Position Sensor (TPS) Circuit Meaning: Voltage from the Throttle Position Sensor is out of range (too low or too high). Possible causes: Faulty TPS sensor (on throttle body) Loose or corroded TPS connector Broken wire between TPS and ECU Incorrect TPS voltage adjustment Fix/check: 1. Unplug TPS conn