Page 2518 of 4323
DI±2316
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2510 Author: Date:
2005 SEQUOIA (RM1146U)
2. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, VSV, actuator and so on to oper-
ate without part removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to
shorten labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) From the display on the tester, perform the ºACTIVE TESTº.
AIR CONDITIONING:
ItemTest Details / Display (Range)Diagnostic Note
BLOWER MOTORBlower motor / min.: 0 max.: 31±
AIR MIX DAMP±DAir mix damper (Driver side) / min.: ±14% max.: 113.5%±
A/I DAMP±LINEARAir inlet damper position (Linear) / min.: ±14% max.: 113.5%±
REAR BLOWERBlower motor (Rear) / min.: 0 max.: 31±
AIR MIX DAMP±RAir mix damper (Rear) / min.: ±14% max.: 113.5%±
A/C MAG CLUTCHA/C magnetic clutch relay / OFF, ON±
DEFOGGER RLY±RDefogger relay (Rear) / OFF, ON±
Page 2519 of 4323
DI3F1±09
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2317
2511 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.)
DTC No.
(See page)Detection ItemTrouble AreaMemory
00Normal±±
11 *1
(DI±2319)
Front room temperature sensor circuitFront room temp. sensor
Harness or connector between front room temp. sensor and
integration control and panel
Integration control and panel
(8.5 min. or more)
12 *2
(DI±2322)
Ambient temperature sensor circuitAmbient temp. sensor
Harness or connector between ambient temp. sensor and
integration control and panel
Integration control and panel
(8.5 min. or more)
13
(DI±2325)
Front evaporator temperature sensor
circuitFront evaporator temp. sensor
Harness or connector between front evaporator temp. sen-
sor and integration control and panel
Integration control and panel
(8.5 min. or more)
14
(DI±2328)
Engine coolant temperature sensor cir-
cuitEngine coolant temp. sensor
Harness or connector between engine coolant temp. sensor
and ECM
Harness or connector between ECM and integration control
and panel
Integration control and panel
ECM
±
17
(DI±2330)
Rear evaporator temperature sensor
circuitRear evaporator temp. sensor
Harness or connector between rear evaporator temp. sensor
and integration control and panel
Integration control and panel
(8.5 min. or more)
19 *1
(DI±2333)
Rear room temperature sensor circuitRear room temp. sensor
Harness or connector between rear room temp. sensor and
integration control and panel
Integration control and panel
(8.5 min. or more)
21 *3
Solar sensor circuit (Open)Solar sensor
Harness or connector between solar sensor and integration±
21 *3
(DI±2336)Solar sensor circuit (Short)Harness or connector between solar sensor and integration
control and panel
Integration control and panel
(8.5 min. or more)
22 *4
(DI±2339)
All conditions below are detected for 3
sec. or more
(a) Engine speed: 450 rpm or more
(b) Ratio between engine and compres-
sor rpm deviates 20% or more in com-
parison to normal operation.Compressor drive belt
Compressor lock sensor
Compressor
Harness or connector between compressor lock sensor and
integration control and panel
Integration control and panel
±
23
(DI±2342)
Open in pressure sensor circuit
Abnormal refrigerant pressure
[below 196 kPa (2.0 kgf/cm
2, 28 psi)
over 3,140 kPa (32.0 kgf/cm2, 455 psi)]
Pressure switch
Harness or connector between pressure switch and integra-
tion control and panel
Refrigerant pipe line
Integration control and panel
±
Page 2520 of 4323
DI±2318
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2512 Author: Date:
2005 SEQUOIA (RM1146U)31
(DI±2346)
Front air mix damper position sensor
circuitFront air mix damper position sensor
Harness or connector between front air mix damper position
sensor and integration control and panel
Integration control and panel
(1 min. or more)
32
(DI±2349)
Air inlet damper position sensor circuitAir inlet damper position sensor
Harness or connector between air inlet damper position
sensor and integration control and panel
Integration control and panel
(1 min. or more)
37
(DI±2352)
Water valve damper position sensor cir-
cuitWater valve damper position sensor
Harness or connector between water valve damper position
sensor and integration control and panel
Integration control and panel
(1 min. or more)
41
(DI±2355)
Front air mix damper control servomotor
circuitFront air mix damper control servomotor
Front air mix damper position sensor
Harness or connector between integration control and panel
and front air mix damper control servomotor
Harness or connector between air mix position sensor and
integration control and panel front
Integration control and panel
(15 sec. or more)
42
(DI±2358)
Air inlet damper control servomotor cir-
cuitAir inlet damper control servomotor
Air inlet damper position sensor
Harness or connector between air inlet damper control ser-
vomotor and integration control and panel
Harness or connector between air inlet damper position
sensor and integration control and panel
Integration control and panel
(15 sec. or more)
47
(DI±2361)
Water valve damper control servomotor
circuitWater valve damper control servomotor
Water valve damper position sensor
Harness or connector between water valve damper control
servomotor and integration control and panel
Harness or connector between water valve damper position
sensor and integration control and panel
Integration control and panel
(15 sec. or more)
HINT:
*1 If the room temp. is approx. ±20°C (±4°F) or lower, this DTC may be output even though the system
is normal.
*2
If the ambient temp. is approx. ±50°C (±58°F) or lower, DTC 12 may be output even though the sys-
tem is normal.
*3
If the check is being performed in a dark place, DTC 21 (solar sensor circuit abnormal) could be dis-
played. In this case, perform DTC check again while illuminating the solar sensor with an inspection
light etc.. If DTC 21 is still displayed, there could be trouble in the solar sensor circuit.
*4
Compressor lock (DTC 22) is indicated only for a current malfunction. (See page DI±2339)
To confirm DTC 22, preform the following steps.
(1) With the engine ON, enter the DTC check mode.
(2) Press the R/F switch to enter actuator check mode, and set the operation to Step No. 3.
(3) Press the AUTO switch to return to DTC check mode.
(4) The DTC is displayed after approx. 3 sec.
Page 2521 of 4323
DIDKT±01
I25617
A14
A/C Room Temp.
Sensor (Front)
2 1
R±W
SG±TR TR Integration Control and Panel
3
L±W
I20
1
I20
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2319
2513 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC 11 Front Room Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appropriate signals to the integration
control and panel.
DTC No.Detection ItemTrouble Area
11Open or short in front room temperature sensor circuit.
Front room temp. sensor
Harness or connector between front room temp. sensor and
integration control and panel
Integration control and panel
WIRING DIAGRAM
Page 2522 of 4323
I28847
SG±TR TRI20 Integration Control and Panel:
DI±2320
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2514 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals TR and SG±TR of integration control and pan-
el.
PREPARATION:
Remove integration control and panel with connectors still con-
nected.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between terminals TR and SG±TR
of the integration control and panel connector at each
temperature.
OK:
Voltage :
at 25°C (77°F) : 1.8 to 2.2 V
at 40°C (104°F) : 1.2 to 1.6 V
HINT:
As the temperature increases, the voltage decreases.
NG Go to step 2.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2304). How-
ever, if DTC 11 is displayed, replace integration control and panel.
Page 2523 of 4323
I08310
21
I28970
Resistance (kW)
Temperature
4.0
2.0 3.5
1.5
0.0
10 3.0
1.0 2.5
0.5
20 30 40 5060
68 86 104 122140
(C)
(F) 50
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2321
2515 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check front room temperature sensor.
PREPARATION:
Disconnect the room temperature sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the room
temperature sensor connector at each temperature.
OK:
Tester connectionConditionSpecified condition
1±210C (50F)3.00 to 3.73 kW
1±215C (59F)2.45 to 2.88 kW
1±220C (68F)1.95 to 2.30 kW
1±225C (77F)1.60 to 1.80 kW
1±230C (86F)1.28 to 1.47 kW
1±235C (95F)1.00 to 1.22 kW
1±240C (104F)0.80 to 1.00 kW
1±245C (113F)0.65 to 0.85 kW
1±250C (122F)0.50 to 0.70 kW
1±255C (131F)0.44 to 0.60 kW
1±260C (140F)0.36 to 0.50 kW
NOTICE:
Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.
When measuring, the sensor temperature must be
the same as the ambient temperature.
HINT:
As the temperature increases, the resistance decreases (see
the graph on the left).
NG Replace front room temperature sensor.
OK
3 Check harness and connector between front room temperature sensor and in-
tegration control and panel (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace integration control and panel.
Page 2524 of 4323
I28832
SG±TAM Integration Control
and Panel
20
12
I19 Y±B
IA5
13 A1
A/C Ambient
Temp. SensorY±B
8
TA M LG±B LG±B 1
2
I19 IA5Y±BJ/C
J14 CA
J15 DI±2322
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2516 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 12 Ambient Temperature Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the ambient temperature and sends the appropriate signals to the integration control
and panel.
DTC No.Detection ItemTrouble Area
12Open or short in ambient temperature sensor circuit.
Ambient temp. sensor
Harness or connector between ambient temp. sensor and
integration control and panel
Integration control and panel
WIRING DIAGRAM
DIDKU±01
Page 2525 of 4323
I28847
SG±TAMTA M I19 Integration Control and Panel:
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2323
2517 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals TAM and SG±TAM of integration control and
panel.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between terminals TAM and SG±
TAM of the integration control and panel connector at
each temperature.
OK:
Voltage :
at 25°C (77°F) : 1.35 to 1.75 V
at 40°C (104°F) : 0.85 to 1.25 V
HINT:
As the temperature increases, the voltage decreases.
NG Go to step 2.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2304). How-
ever, if DTC 12 is displayed, replace integration control and panel.
