[55B] AUTOMATIC AIR CONDITIONER - - TROUBLESHOOTING - CHECK AT A/C-ECU TERMINALSPRINT PAGE / INDEX / PRIOR / NEXT
CHECK AT A/C-ECU TERMINALS
   
Terminal No.
 Check items
 Check conditions
 Normal conditions
1
 Interior temperature sensor
 Sensor temperature: 25°C (4kΩ)
 2.1- 2.7V
2
 Output to blower pulse controller
 When the blower is operating.
 0 - 2.5V (Effective alternating voltage)
3
 Back-up power supply
 Always
 System voltage
4
 Input from heater water temperature sensor
 Sensor temperature: 25°C (4kΩ)
 2.1 - 2.7V
5
 Input from air mixing door control motor potentiometer
 When the damper flaps is moving to the MAX HOT position.
 4.1 - 4.6 V
6
 Input from mode selection damper control motor potentiometer
 When the damper is moved to the DEF position.
 4.1 - 4.6 V
7
 Input from the outside thermo sensor
 Sensor temperature: 25°C (4kΩ)
 2.1 - 2.7 V
8
 Input from the air thermo sensor
 Sensor temperature: 25°C (4kΩ)
 2.1 - 2.7 V
9
 Photo sensor (-)
 Brightness is 0 lux
 4.9 - 5.1 V
Brightness is 100000 lux or more
Approximately 0 V
10
 Potentiometer power supply
 Always
 5 V
11
 Input from the A/C pressure sensor
 2.6 Mpa
 3.9 V
12 - 15
 -
 -
 -
16
 Rear defogger
 When the rear defogger is operating.
2.0 V or less
When the rear defogger is stopped
 System voltage
17
 Diagnosis set
 Ignition switch: ON
 A voltmeter needle fluctuates between 0 and 12 V.
18
 Input from diagnosis
 Ignition switch: ON
 Approximately 5 V
19
 Photo sensor (+)
 Always
 0 V
20
 Sensors and potentiometers earth
 Always
 0 V
21
 Air outlet changeover damper motor (FACE)
 When the damper is moved to the FACE position.
 10 V
When the damper is moved to the DEF position.
 Faint voltage (0.5 V)
22
 Air mix damper motor (MAX COOL)
 When the damper flaps is moving to the MAX COOL position.
 10 V
When the damper flaps is moving to the MAX HOT position.
 Faint voltage (0.5 V)
23
 outside/inside air selection damper control motor (outside)
 When the damper is moved to the inside air recirculation position
 10 V (When the motor is stopped)
When the damper is moved to the outside air inside air intake position
 2.0 or less
24
 Mode selection damper control motor and potentiometer (DEF)
 When the damper is moved to the FACE position.
 Faint voltage (0.5 V)
When the damper is moved to the DEF position.
 10 V
25
 Air mixing door control motor and potentiometer (MAX HOT)
 When the damper flaps is moving to the MAX COOL position.
 Faint voltage (0.5 V)
When the damper flaps is moving to the MAX HOT position.
 10 V
26
 outside/inside air selection damper control motor (inside)
 When the damper is moved to the inside air recirculation position
 2.0 V or less
When the damper is moved to the outside air inside air intake position
 10 V (When the motor is stopped)
27
 Earth
 Always
 Continuity exists.
28
 IG2 power supply
 Ignition switch: ON
 System voltage
29
 Illumination earth
 Always
 Continuity exists.
30
 ILL power supply
 Lighting switch: ON
 System voltage
31
 -
 -
 -
32
 Input from the engine-A/T-ECU (A/C2)
 When the A/C is under low load
 System voltage
33
 Input from the compressor relay
 Compressor: ON
 System voltage
34
 Input from the engine-A/T-ECU (A/C1)
 When the A/C is stopped
 0 V
When the A/C is operating (When the compressor is operating)
 System voltage
35
 -
 -
 -
36
 ACC power supply
 Ignition switch: ACC
 System voltage

[55B] AUTOMATIC AIR CONDITIONER - - TROUBLESHOOTING - CHECK AT A/C-ECU TERMINALSPRINT PAGE / INDEX / PRIOR / NEXT
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