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Home >> Lexus >> 2009 >> LS 460L AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transaxle (Aa80E)) >> Automatic Transmission System >> DTC P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input; DTC P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input >> Description
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DTC P0712 Transmission Fluid Temperature Sensor "A" Circuit Low Input; DTC P0713 Transmission Fluid Temperature Sensor "A" Circuit High Input: Description

WARNING: This page is about a different variant/trim than selected.

The transmission fluid temperature is detected using the Automatic Transmission Fluid (ATF) temperature sensor, which is built onto the valve body. Depending on the fluid temperature, a signal is input into the TCM.

Fig 1: Temperature And Resistance Graph
G06186840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

The TCM applies a voltage to the temperature sensor through TCM terminal OIL.

The sensor resistance changes with the ATF temperature. As the temperature becomes higher, the sensor resistance decreases.

One terminal of the sensor is grounded so that the sensor resistance decreases and the voltage decreases as the temperature becomes higher.

The TCM calculates the ATF temperature based on the voltage signal.

DTC DETECTION CONDITION CHART

DTC Code DTC Detection Condition
  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other
Trouble Area
P0712
  1. P0713 is not stored
  2. ATF temperature sensor resistance is below 79 Ω
  3. 0.5 seconds
  4. 1 trip detection logic
  • Transmission wire (ATF temperature sensor)
  • Harness and connector
  • TCM
P0713
  1. P0712 is not stored, and either 15 minutes or more have passed after the engine is started, or the diagnosis condition for DTC P0711 is met
  2. ATF temperature sensor resistance is higher than 156 kΩ
  3. 0.5 seconds
  4. 1 trip detection logic
  • Transmission wire (ATF temperature sensor)
  • Harness and connector
  • TCM