2001 TOYOTA SEQUOIA engine

± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2329
2523 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Is DTC P0115, P0117 or P0118 output?
YES Go to engine troubleshooting
(See page DI±9).
NO
2 Check harness and connector between ECM and integration control and panel.
NG Repair or replace harness or connector.
OK
Replace integration control and panel.

I28835
24
Y±B W±R
A3
A/C Magnetic Clutch
and Lock Sensor 2
1IG4
SG±TAM Integration Control
and Panel
13
I19LOCK
20
I19 Y±B W±R
J14
J/C
AA 23
Y±B
IG4
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2339
2533 Author: Date:
2005 SEQUOIA (RM1146U)
DTC 22 Compressor Lock Sensor Circuit
CIRCUIT DESCRIPTION
This sensor sends 1 pulse per engine revolution to the integration control and panel.
If the compressor speed divided by the engine speed is smaller than a predetermined value, the integration
control and panel turns the compressor OFF. The indicator flashes at about 1 second intervals.
DTC No.Detection ItemTrouble Area
22
All conditions below are detected for 3 sec. or more
(a) Engine speed: 450 rpm or more
(b) Ratio of engine to compressor speed deviates 20% or more
in comparison 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
WIRING DIAGRAM
DIDKY±01

I05252
21
N02774
0.2 V/Din.
LOCK IN signal waveform
0 V
20 msec/Division (Idling)
DI±2340
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2534 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check compressor.
PREPARATION:
(a) Check and adjust compressor drive belt tension (See page AC±15).
CHECK:
(a) Check that the compressor does not lock when starting the engine and turning the A/C switch on.
OK: Cooler compressor assy does not lock during operation
HINT:
If the compressor drive belt slips when the A/C switch is on, the magnet clutch seems to be locked.
If the condition continues for more than 3 seconds, the A/C amplifier turns off the magnet clutch for compres-
sor drive belt protection.
NG Replace compressor.
OK
2 Check compressor lock sensor.
PREPARATION:
Disconnect the compressor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the com-
pressor lock sensor connector.
OK:
Resistance : 65 to 125 W at 20°C (68 °F)
Reference: Inspection using oscilloscope
During cranking or idling, measure the voltage between termi-
nals LOCK and SG±TAM of the integration control and panel.
HINT:
The correct waveform appears as shown in the illustration on
the left.
NG Replace compressor.
OK

I29010
Pressure switch:
A4
DI±2344
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2538 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check refrigerant pressure.
(a) Set the manifold gauge.
(b) Read the manifold gauge pressure when these conditions are established.
Test conditions:

Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F)

Engine running at 1,500 rpm

Blower speed control switch at ºHIº position

Temperature control dial at ºCOOLº position

Air conditioning switch ON

Fully open doors
Standard:
Pressure on high pressure side:
1.37 to 1.57 MPa (13.9 to 16.0 kgfVcm
2, 198 to 228 psi)
HINT:
If the refrigerant pressure is below 196 KPa (2.0 kgfVcm
2, 28 psi), the refrigerant amount the air conditioning
cycle may have decreased significantly for reasons such as a gas leakage.
NG Check air conditioning cycle
(See page AC±3).
OK
2 Check air conditioning operation.
(a) Disconnect the pressure switch connector.
(b) Connect terminals 1 and 4 of the connector of the pres-
sure switch on the vehicle wire harness side using a ser-
vice wire.
(c) Start the engine.
(d) Turn the air conditioning switch is on and check that the
magnet clutch is turned on.
(e) Check that the magnet clutch is turned off when discon-
necting terminals 1 and 4 (that are connected in the prior
step).
OK:
Terminals 1 and 4 connected: magnet clutch is on
Terminals 1 and 4 disconnected: magnet clutch is off
NG Go to step 3.
OK

DI±2356
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2550 Author: Date:
INSPECTION PROCEDURE
1 Actuator check.
PREPARATION:
(a) Warm up the engine.
(b) Set to the actuator check mode (See page DI±2303).
(c) Press the DEF switch and change it to step operation.
CHECK:
Press the DEF switch and check the operation of the air mix damper and the condition of the blower.
OK:
Display CodeAir Mix DamperCondition
0 ± 3±14% (Fully closed)Cool air comes out
4, 550%±
6 ± 9113.5% (Fully opened)Warm air comes out
HINT:
However, if DTC 41 is displayed, replace the integration control and panel.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2304).
NG

I24456
Integration Control
and Panel
Engine Room J/B
Battery
F10
Fusible Link
Block Instrument
Panel J/B
10 A DOMESHORT PIN R
1J3A 3E I19
2C2D
BSub J/B No. 3
BB
R581
3
54 16 6
1E
1 RR
+B DI±2366
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2560 Author: Date:
2005 SEQUOIA (RM1146U)
Back±up Power Source Circuit
CIRCUIT DESCRIPTION
This is the back up power source for the integration control and panel. Power is supplied even when the
ignition switch is off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
DI3FL±10

I28847
+B I19 Integration Control and Panel:
I22575
DOME Fuse Engine Room J/B
± DIAGNOSTICSAIR CONDITIONING SYSTEM
DI±2367
2561 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminal +B of integration control and panel and body
ground.
PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
Measure the voltage between terminal +B of the integration
control and panel and body ground.
OK:
Voltage : 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2304).
NG
2 Check DOME fuse.
PREPARATION:
Remove the DOME fuse from the engine room J/B.
CHECK:
Check continuity of the DOME fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the DOME fuse (See at-
tached wiring diagram).
OK
Check and repair harness and connector between integration control and panel and battery.

I28848
IGN
I223
Y±G B
23
Combination Meter TACHIntegration Control
and Panel
E5Y±G 1
Y±G
C5 ECM
J17
J/C
B
B J14D
J14F
J15
F DI±2372
± DIAGNOSTICSAIR CONDITIONING SYSTEM
2566 Author: Date:
2005 SEQUOIA (RM1146U)
Igniter Circuit
CIRCUIT DESCRIPTION
The integration control and panel monitors the engine speed through signals sent from the igniter. It uses
these signals and compressor speed signals to detect the compressor lock condition.
WIRING DIAGRAM
DI3WE±19