DESCRIPTION
The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature which is used to control the air conditioning system AUTO mode. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the ambient temperature sensor changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.
The air conditioning amplifier assembly applies a voltage (5 V) to the ambient temperature sensor and reads voltage changes due to changes in the resistance of the ambient temperature sensor.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1412 |
Open or short in cooler thermistor (ambient temperature sensor) circuit |
|
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Check the value(s) by referring to the table below.
Air Conditioner
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Ambient Temp Sensor |
Ambient temperature sensor / Min: -23.30°C (-9.94°F) Max: 65.95°C (150.71°F) |
Actual ambient temperature displayed |
- |
OK:
The display is as specified in the Normal Condition column.
Result |
Proceed to |
---|---|
NG |
A |
OK (When troubleshooting according to Problem Symptoms Table) |
B |
OK (When troubleshooting according to the DTC) |
C |
B | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
C | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
2. |
INSPECT AMBIENT TEMPERATURE SENSOR |
(a) Remove the ambient temperature sensor (See page
).
(b) Inspect the ambient temperature sensor (See page
).
NG | ![]() |
REPLACE AMBIENT TEMPERATURE SENSOR |
|
3. |
CHECK HARNESS AND CONNECTOR (AMBIENT TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the A13 ambient temperature sensor connector.
(b) Disconnect the A14 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A14-7 (TAM) - A13-1 (+) |
Always |
Below 1 Ω |
A14-33 (SG-1) - A13-2 (-) |
Always |
Below 1 Ω |
A14-7 (TAM) or A13-1 (+) - Body ground |
Always |
10 kΩ or higher |
A14-33 (SG-1) or A13-2 (-) - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Communication Error from VSC to ECM (P1630)
DESCRIPTION
The skid control ECU (brake actuator assembly) sends signals such as cruise control
cancel signals and brake demand response signals to the ECM when the dynamic radar
cruise control system is operating.
DTC No.
Detection Item
DTC Detection Condition ...
Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1275,...,C1414)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code
DTC Detection Condition
Trouble Area
C1275
C1276
Stored only during test mode.
Front speed sensor RH/LH
Front speed sensor rotor RH/LH (Front ...
Crawl Indicator Light Remains ON
DESCRIPTION
When CRAWL starts after operating the CRAWL switch (drive monitor switch), the
CRAWL indicator light turns on. While CRAWL is in the process of stopping, the CRAWL
indicator light begins blinking. When CRAWL totally stops, the CRAWL indicator light
turns off.
WIRING DIAGRAM
CA ...