DTC 13: Evaporator Temperature Sensor Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Evaporator Temperature Sensor Circuit

Check voltage between terminals TE and SGTE of A/C amplifier connector.

Fig 2: Locating A/C Amplifier Terminals TE & SGTE
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Preparation
1. Remove center cluster module control with connectors still connected.
2. Turn ignition switch ON.
  NOTE: As the temperature increases, the voltage decreases.
  
  Check: Measure voltage between terminals TE and SGTE of A/C amplifier connector at each temperature. If OK , voltage at 0 °C (32 °F) : 2.0 - 2.4 V, at 15 °C (59 °F) : 1.4 - 1.8 V.
1. NG: Go to step 2 .
2. If OK , proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS TABLE . However, if DTC 13 is displayed, check and replace A/C amplifier.
Check evaporator temperature sensor.
PREPARATION: Remove evaporator temperature sensor. See step 2 of AIR CONDITIONING UNIT DISASSEMBLY .

NOTE: As the temperature increases, the voltage decreases.

Check: resistance between terminals 1 and 2 of evaporator temperature sensor connector at each temperature. If OK , resistance at 0 °C (32 °F) : 4.6. - 5.1 kΩ, at 15 °C (59 °F) : 2.1 - 2.6 kΩ.

Fig 3: Testing Evaporator Temperature Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace evaporator temperature sensor.
2. OK: Go to step 3 .
Check harness and connector between A/C amplifier and evaporator temperature sensor . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
1. NG: Repair or replace harness or connector.
2. If OK , check and replace A/C amplifier.