DTC B1503: Exhaust Heat Management Warning Detected: Description

This DTC is stored when the combination meter assembly detects a malfunction in the temperature switch that is connected to the combination meter assembly via a direct line.

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

HINT:

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