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

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