Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000018MY004X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 13; Evaporator Temperature Sensor Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

13

Evaporator Temperature Sensor Circuit

DESCRIPTION

This sensor detects the temperature inside the cooling unit and sends the appropriate signals to the A/C amplifier.

DTC No.

Detection Item

Trouble Area

13

Open or short in front evaporator temperature sensor circuit
  • Front evaporator temperature sensor
  • Harness or connector between front evaporator temperature sensor and A/C amplifier
  • A/C amplifier

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK AIR CONDITIONING AMPLIFIER

(a) Remove the A/C amplifier with the connectors still connected.

(b) Turn the ignition switch ON.

(c) Measure the voltage between terminals FRTE (A48-16) and FRSG (A48-18) 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

NG

2.

INSPECT FRONT EVAPORATOR TEMPERATURE SENSOR

(a) Remove the front evaporator temperature sensor.

(b) 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

OK

3.

CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - FRONT EVAPORATOR TEMPERATURE SENSOR)
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE AIR CONDITIONING AMPLIFIER