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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–135 ES HINT: DESCRIPTION This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75 °C (167°F) despite sufficient engine warm-up time. MONITOR DESCRIPTION The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The °C (167°F), the ECM checks the actual ECT. If the actual ECT is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC. DTC P0128 Coolant Thermostat (Coolant Temperature DTC No. DTC Detection Conditions Trouble Areas P0128 Conditions (a), (b) and (c) are met for 5 seconds (2 rip detection logic) °C (167°F) • Thermostat • Cooling system • ECT sensor • ECM Threshold ECT Time DTC set (after 2 driving cycles) Indicated ECT reading Estimated ECT 5 seconds A115933E01 |