Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR CONDITIONING AMPLIFIER
1. Remove the A/C amplifier with the connectors still connected.
2. Turn the ignition switch ON.
3. Measure the voltage between terminals FRTE (A46-16) and FRSG (A46-18) of the A/C amplifier connector at each temperature.
  Standard voltage: 2.0 to 2.4 V at 0°C (32°F)
  
  1.4 to 1.8 V at 15°C (59°F)
  
  HINT:
  - As the temperature increases, the voltage decreases.
  - However, if DTC 13 is displayed, check and replace the A/C amplifier.
OK: REPLACE AIR CONDITIONING AMPLIFIER

Fig 1: Measure Voltage Between Terminals FRTE (A46-16) & FRSG (A46-18) Of A/C Amplifier Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO NEXT STEP
INSPECT FRONT EVAPORATOR TEMPERATURE SENSOR
1. Remove the front evaporator temperature sensor.
2. Measure the resistance between terminals 1 and 2 of the evaporator temperature sensor connector at each temperature.
  Standard resistance: 4.5 to 5.2 kΩ at 0°C (32°F)
  
  2.0 to 2.7 kΩ at 15°C (59°F)
  
  HINT:
  
  As the temperature increases, the resistance decreases.
NG: REPLACE FRONT EVAPORATOR TEMPERATURE SENSOR

Fig 2: Measuring Resistance Between Terminals 1 & 2 Of Evaporator Temperature Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP
CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - FRONT EVAPORATOR TEMPERATURE SENSOR)
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE AIR CONDITIONING AMPLIFIER