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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Electrical >> Gauges >> Meter / Gauge / Display - Diagnostic Codes & Symptom Tests - (Hybrid) >> Meter / Gauge System >> DTC B1503: Exhaust Heat Management Warning Detected [02/2014 - 11/2016] >> Description

DTC B1503: Exhaust Heat Management Warning Detected [02/2014 - 11/2016]: 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. Detection Item DTC Detection Condition Trouble Area Memory Note
B1503 Exhaust Heat Management Warning Detected When IG voltage is 9.5 V or more and the following condition is detected:
  • Temperature switch circuit open or shorted
  • Temperature is 120°C (248°F) or more
  • Harness or connector
  • Temperature switch
  • Combination meter assembly
DTC stored -

HINT: 

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