DTC B1503: Exhaust Heat Management Warning Detected: Description

This DTC is stored when the combination meter assembly (No. 3 meter circuit plate) detects a malfunction in the water temperature sensor that is connected to the combination meter assembly (No. 3 meter circuit plate) via a direct line.

DTC No.	DTC Detection Condition	Trouble Area
B1503	When IG voltage is 9.5 V or more and the following condition is detected: Water temperature sensor operation malfunction Water temperature sensor circuit open or short Engine coolant temperature is 120°C (248°F) or more	Harness or connector Water temperature sensor Combination meter assembly (No. 3 meter circuit plate)

HINT:

This DTC is for the water temperature sensor which is used to detect the engine water temperature sensor for the exhaust heat recirculation system, not for the engine coolant temperature sensor which is used for the EFI system.