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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 92 (Heating / Air Conditioning System (HV) - Diagnostic Codes (3 Of 3), Circuit Tests & Symptom Tests) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC P153B-11: Rear Evaporator Temperature Sensor Circuit Short to Ground [11/2023 - ] >> Description

DTC P153B-11: Rear Evaporator Temperature Sensor Circuit Short to Ground [11/2023 - ]: Description

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The rear evaporator temp. sensor (No. 2 air conditioning harness assembly) is installed to the evaporator in the rear cooling unit to detect the temperature of the cooled air that has passed through the evaporator, which is used to control the air conditioning system. It sends signals to the air conditioning amplifier assembly. The resistance of the rear evaporator temp. sensor (No. 2 air conditioning harness assembly) changes in accordance with the temperature of the cooled air that has passed through the evaporator. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage to the rear evaporator temp. sensor (No. 2 air conditioning harness assembly) and reads voltage changes as the resistance of the rear evaporator temp. sensor (No. 2 air conditioning harness assembly) changes. This sensor is used for frost prevention.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from Priority
P153B-11 Rear Evaporator Temperature Sensor Circuit Short to Ground Diagnosis Condition:
  1. Ignition switch ON

Malfunction:

  1. Short (GND) in rear evaporator temperature sensor circuit

Detection Time:

  1. Continuously for 4 seconds or more
  • Rear evaporator temp. sensor (No. 2 air conditioning harness assembly)
  • Harness or connector
  • Air conditioning amplifier assembly
 Memorized Air Conditioner A
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