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Air Conditioning: Other Toyota 4Runner IV рестайлинг

Automatic HVAC System 11 illustrations ~1038 words

PRECAUTION

Note. Because the compressor operates at high voltages, wear electric insulated gloves and pull out the service plug to cut the high-voltage circuit before inspection.

Scheme 211

Scheme 211: PRECAUTION
Scheme 211: PRECAUTION

Scheme 212

Scheme 212
Scheme 212

Scheme 213

Scheme 213
Scheme 213
  1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME.
  2. ALWAYS WEAR EYE PROTECTION
  3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin: Wash the area with lots of cold water. CAUTION: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a hospital or see a physician for professional treatment.
  4. NEVER HEAT CONTAINER OR EXPOSE IT TO OPEN FLAME
  5. BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
  6. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the A/C system, oil lubrication will be insufficient and the compressor may be damaged. Necessary care should be taken to avoid this.
  7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING Open and close only the low pressure valve. If the high pressure values are opened, refrigerant flows in the reverse direction causing the charging cylinder to rupture. If the high pressure valve is opened, refrigerant flows in the reverse direction causing the charging cylinder to rupture.
  8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.
  9. GENERAL PRECAUTION While using the battery during inspection, do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

Scheme 214

Scheme 214: PARTS LOCATION
Scheme 214: PARTS LOCATION

Scheme 215

Scheme 215
Scheme 215

Scheme 216

Scheme 216
Scheme 216

ACTUATOR CHECK

  1. ACTUATOR CHECK Start the engine and warm it up. Perform the indicator check (See «CHECK MODE PROCEDURE»(ref-280565-S05295149072008022200000) ). Push the "R/F" switch to perform the actuator check. HINT: Be sure to perform the actuator check after starting the engine. As the actuator check is repeated from steps 1 to 10 at 1 second intervals, check the temperature and air flow visually and by hand. HINT: The display blinks at 1 second intervals in the step operation. As an example, the see scheme 30 shows that display code 21 is output. Push the "OFF" switch to finish panel diagnosis. Push the "AUTO" switch to enter the sensor check mode. AIR MIXTURE DAMPER CONDITIONS TABLE Step No. Display Code Conditions Blower Level Air Flow Vent Air Inlet Damper Magnetic clutch Air Mix Damper 1 0 0 FACE RECIRCULATION OFF "COLD" side (Fully closed) 2 1 1 FACE RECIRCULATION OFF "COLD" side (Fully closed) 3 2 17 B/L FRESH/RECIRCULATION ON "COLD" side (Fully closed) 4 3 17 B/L FRESH/RECIRCULATION ON "COLD"/"HOT" (50% open) 5 4 17 FOOT FRESH ON "COLD"/"HOT" (50% open) 6 5 17 FOOT FRESH ON "COLD"/"HOT" (50% open) 7 6 17 FOOT FRESH ON "HOT" side (Fully opened) 8 7 17 FOOT/ DEF FRESH ON "HOT" side (Fully opened) 9 8 17 FOOT/ DEF FRESH ON "HOT" side (Fully opened) 10 9 31 DEF FRESH ON "HOT" side (Fully opened) If the steps are difficult to read because they change automatically, push the "FRONT DEF" switch to display the steps one at a time so that they can be read easily. The items are displayed step by step each time the "FRONT DEF" switch is pushed. HINT: Push the "OFF" switch to finish panel diagnosis. Push the "AUTO" switch to enter the sensor check mode.

Duty Ratio

The duty ratio is the ratio of the blower motor ON time (A) to the total of the blower motor ON and OFF time (A + B). The blower motor controller controls the blower motor speed.

Scheme 217

Scheme 217: WIRING DIAGRAM
Scheme 217: WIRING DIAGRAM

Scheme 218

Scheme 218: INSPECTION PROCEDURE
Scheme 218: INSPECTION PROCEDURE

Scheme 219

Scheme 219
Scheme 219

Scheme 220

Scheme 220
Scheme 220

Scheme 221

Scheme 221
Scheme 221
  1. PERFORM ACTUATOR CHECK Operate the A/C control panel to enter the actuator check mode (See «ACTUATOR CHECK»(ref-280565-S20309190522008022200000) ). Press the blower switch and change it to the step operation. Check the air flow temperature by hand. AIR MIX DAMPER OPERATION Display Code Air Mix Damper Operation 0 0 (No blower) 1 1 (LO) 2 17 (Medium) 3 17 (Medium) 4 17 (Medium) 5 17 (Medium) 6 17 (Medium) 7 17 (Medium) 8 17 (Medium) 9 31 (HI) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN NG: GO TO NEXT STEP
  2. INSPECT FUSE (HTR NO. 2) Remove the HTR No. 2 fuse from the engine room R/B. Measure the resistance according to the value(s) in «FUSE (HTR NO. 2)»(ref-280565-S21044159102008022200000). Standard resistance FUSE (HTR NO. 2) Tester Item Condition Specified Condition J- HTR No. 2 fuss Always Below 1 ohms NG: REPLACE FUSE (HTR NO. 2) OK: GO TO NEXT STEP
  3. INSPECT BLOWER WITH FAN MOTOR SUB-ASSEMBLY Remove the blower with fan motor sub-assembly. Connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 1. OK: Blower motor operates smoothly. NG: REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY OK: GO TO NEXT STEP
  4. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - BLOWER MOTOR CONTROL) Check for open and short circuit in the harness and the connector between the blower motor relay and the blower motor control (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
  5. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - BODY GROUND) Check for open and short circuit in the harness and the connector between the blower motor control and body ground (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP
  6. INSPECT AIR CONDITIONING AMPLIFIER (BLW) Remove the A/C amplifier with the connectors still connected. Turn the ignition switch ON. Set the blower speed to LO. Measure the waveform between terminal A16-3 (BLW) of the A/C amplifier and body ground. OK: Waveform appears (Scheme 221) HINT: Waveform varies with the blower level. NG: REPLACE AIR CONDITIONING AMPLIFIER OK: GO TO NEXT STEP
  7. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - A/C AMPLIFIER) Check for open and short circuit in the harness and the connector between the blower motor control and the A/C amplifier (See «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-280562-S30988147692008022200000) ). NG: REPLACE AIR CONDITIONING AMPLIFIER OK: REPLACE BLOWER MOTOR CONTROL

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