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Engine Control System (4JH1) 6E-239 Preliminary Checks • Remove the air cleaner and check for dirt, or for air ducts being plugged or restricted. Replace as necessary. • Inspect the driving habits of the owner. Manual. • Inspect the odometer is correctly operated. Sensor Checks Inspect the engine control sensors for the following conditions. Refer to the Tech 2 • Use the Tech 2 to compare the Engine Coolant Temperature (ECT) with the Intake Air Temperature (IAT) and Fuel Temperature (FT) on a cold engine condition. If the °C (9°F) on a cold engine, check for high resistance on the low reference circuit and signal circuit or for a Notice: Fuel System Checks Inspect the fuel system for the following conditions. Refer to the Fuel System section. • Inspect the fuel type and quality. Cooling System Checks Inspect the cooling system for the following conditions. Refer to the Cooling System • Inspect the engine coolant level. Air Intake System Checks Inspect the air intake system for the following conditions. • Inspect the air cleaner and air intake ducts for a restriction, holes, or leaks. Exhaust System Checks Inspect the exhaust system for a possible restriction. Refer to the Exhaust System • Inspect for a restriction in the catalytic converter or exhaust pipes. Engine Mechanical Checks Inspect the engine mechanical for the following conditions. Refer to the Engine • Inspect for poor cylinder compression. Proper compression is more than 2100 kPa (309 psi). Checks Action |