Toyota Sequoia (2005). Manual — part 627
DIDKO–01
I15897
R/F SW
I15897
DEF. SW
STEP
1
2
3
4
5
6
7
8
9
10
DISPLAY
CODE
Fr
BLOWER
LEVEL
Fr
OUTLET
INLET
COMPRESSOR
Fr A/M
DAMPER
Rr
BLOWER
LEVEL
Rr
OUTLET
Rr A/M
DAMPER
1
2
3
4
5
6
7
8
9
0
1
0
16
31
FACE
B/L
FOOT
F/D
DEF
FRS
R/F (50%)
REC
OFF
ON
–14%
50.0%
113.5%
1
0
10
31
FACE1
FACE2
B/L1
B/L2
FOOT
0.0%
40.0%
60.0%
86.5%
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2303
2497
ACTUATOR CHECK
1.
ACTUATOR CHECK
(a)
After entering the sensor check mode, press the R/F
switch (See page
(b)
Since each damper, motor and relay automatically oper-
ates at 1 second intervals beginning in order from 20 in
the temperature display, check the temperature and air
flow visually and by hand.
If a slower display is desired, press the DEF. (Fr.) switch
and change it to step operation. Each time the DEF. (Fr.)
switch is pressed, the display changes by 1 step.
HINT:
Codes are displayed in order from the smallest to the larg-
est numbers.
To cancel the check mode, press the OFF switch.
DI3F3–10
DI–2304
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2498
PROBLEM SYMPTOMS TABLE
Front A/C:
Symptom
Suspected Area
See page
Whole functions of the A/C system do not operate
4. Integration control and panel
5. IG power source circuit
Air Flow Control: No blower operation
1. IG power source circuit
2. Heater main relay
3. Blower motor circuit
4. Integration control and panel
5. Blower motor controller
Air Flow Control: No blower control
1. Blower motor circuit
2. Integration control and panel
3. Solar sensor circuit
4. Blower motor controller
Air Flow Control: Insufficient air flow
1. Blower motor circuit
Temperature Control: No cool air comes out
1. Refrigerant volume
2. Drive belt tension
3. Refrigeration system inspection with manifold gauge set
4. Compressor circuit
5. Pressure switch circuit
6. Front air mix damper position sensor circuit
7. Front air mix damper control servomotor circuit
8. Front room temp. sensor circuit
9. Ambient temp. sensor circuit
10.Vehicle speed signal circuit
11.Integration control and panel
Temperature Control: No warm air comes out
1. Front air mix damper position sensor circuit
2. Front air mix damper control servomotor circuit
3. Front room temp. sensor circuit
4. Ambient temp. sensor circuit
5. Vehicle speed signal circuit
6. Front evaporator temp. sensor circuit
7. Integration control and panel
Temperature Control: Output air is warmer or cooler than the set
temperature or response is slow
1. Refrigerant volume
2. Drive belt tension
3. Refrigeration system inspection with manifold gauge set
4. Cooling fan system
5. Solar sensor circuit
6. Front room temp. sensor circuit
7. Ambient temp. sensor circuit
8. Vehicle speed signal circuit
9. Front evaporator temp. sensor circuit
10.Front air mix damper position sensor circuit
11.Front air mix damper control servomotor circuit
12.Front air inlet damper position sensor circuit
13.Front air inlet damper control servomotor circuit
14.Condenser
15.Evaporator
16.Heater radiator
17.Expansion valve
18.Integration control and panel
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–2305
2499
Symptom
Suspected Area
See page
Temperature Control: No temperature control (only Max. cool or
Max. warm)
1. Front room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Front air mix damper position sensor circuit
4. Front air mix damper control servomotor circuit
5. Integration control and panel
No air inlet control
1. Front air inlet damper position sensor circuit
2. Front air inlet damper control servomotor circuit
3. Integration control and panel
No air flow control
1. Air outlet damper position sensor circuit
2. Air outlet damper control servomotor circuit
3. Integration control and panel
Engine idle up does not occur, or is continuous
1. Compressor circuit
2. ECM
No DTC is recorded. Set mode is cleared when IG switch is
turned off.
1. Back–up power source circuit
2. Integration control and panel
Rear A/C:
Symptom
Suspected Area
See page
Whole functions of the rear A/C system do not operate
1. Heater control assembly
2. Integration control and panel
3. ACC power source circuit
Air Flow Control: No blower operation
1. ACC power source circuit
2. Rear heater main relay
3. Rear blower motor
4. Rear blower motor controller
5. Heater control assembly
6. Integration control and panel
–
Air Flow Control: No blower control
1. Rear heater main relay
2. Rear blower motor
3. Rear blower motor controller
4. Heater control assembly
5. Integration control and panel
6. Solar sensor circuit
–
Air Flow Control: Insufficient air flow
1. Rear blower motor
2. Rear blower resister
–
Temperature Control: No cool air comes out
1. Refrigerant volume
2. Drive belt tension
3. Refrigeration system inspection with manifold gauge set
4. Compressor circuit
5. Pressure switch circuit
6. Water valve damper position sensor circuit
7. Water valve damper control servomotor circuit
8. Rear room temp. sensor circuit
9. Ambient temp. sensor circuit
10.ECM
11.Heater control assembly
12.Integration control and panel
Temperature Control: No warm air comes out
1. Water valve damper position sensor circuit
2. Water valve damper control servomotor circuit
3. Rear room temp. sensor circuit
4. Ambient temp. sensor circuit
5. Rear evaporator temp. sensor circuit
6. Heater control assembly
7. Integration control and panel
DI–2306
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
2500
Temperature Control: Output air is warmer or cooler than the set
temperature or response is slow
1. Refrigerant volume
2. Drive belt tension
3. Refrigeration system inspection with manifold gauge set
4. Cooling fan system
5. Solar sensor circuit
6. Rear room temp. sensor circuit
7. Ambient temp. sensor circuit
8. Rear evaporator temp. sensor circuit
9. Water valve damper position sensor circuit
10.Water valve damper control servomotor circuit
11.Condenser
12.Evaporator
13.Heater radiator
14.Expansion valve
15.Heater control assembly
16.Integration control and panel
Temperature Control: No temperature control (only Max. cool or
Max. warm)
1. Rear room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Water valve damper position sensor circuit
4. Water valve damper control servomotor circuit
5. Heater control assembly
6. Integration control and panel
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