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DTC 21 Solar Sensor Circuit: Description

Fig 1: Photodiode Resistance Graph
G05284135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A photodiode in the solar sensor detects solar radiation and sends signals to the A/C amplifier.

DTC TROUBLE DETECTION CONDITION

DTC No. Detection Item Trouble Area
21 Open or short in solar sensor circuit Please note that display of diagnostic trouble code 21 is not abnormal when the sensor is not receiving solar radiation
  • Solar sensor
  • Harness or connector between solar sensor and A/C amplifier
  • A/C amplifier
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