Monitor Description

Temperature

Estimated ECT . „

5 seconds

Threshold

(75°C (167°F))

ECT

Indicated ECT Reading

Time

DTC Set (after 2 Driving Cycles)

DTC Set (after 2 Driving Cycles)

Y A121605E03

The ECM estimates the ECT based on the starting temperature, engine loads, and engine speeds. The ECM then compares the estimated temperature with the actual ECT. When the estimated ECT reaches 75°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.

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