Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 acsy cidtc23
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DI-721
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3FD-04
DTC 23 Pressure Switch Circuit
CIRCUIT DESCRIPTION
The pressure switch sends the appropriate signals to the A/C amprifier when the A/C refrigerant pressure
drops too low or rises too high. When the A/C control assembly receives these signals, it outputs signals
via the A/C control assembly to switch OFF the compressor relay and turns the magnetic clutch OFF.
DTC No. Detection Item Trouble Area
S Pressure switch.
S Open in pressure sensor circuit.
S Harness or connector between pressure switch and A/C con-
S Abnormal refrigerant pressure.
23 trol assembly
below 196 kPa (2.0 kg/cm2, 28 psi)
S Refrigerant pipe line.
over 3,140 kPa (32.0 kgf/cm2, 455 psi)
S A/C control assembly
WIRING DIAGRAM
A3 A/C control assembly
J8
A/C Dual Pressure
J/C
19 Switch 22 22
B B L-O L-O
IK3 IK3 A25 PSW
R-L R-L
R-L J/B No. 3 Driver Side J/B No. 1
1 20 9 3 HEATER 1
R-L
3C 3C 1R 1K
Engine Room J/B No. 2
2 2 1 AM1 2
W W 1 2
2D 2L 1B 1K R-Y
F8 FL Block W-L
INP ALT FL MAIN I12
Ignition Switch
B-L
2 AM1 IG1 4
Battery
I21121
2001 SIENNA (RM787U)
Author : Date : 875
DI-722
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal PSW and GND of A/C control assembly.
PREPARATION:
ON Install the manifold gauge set.
CHECK:
(a) Turn ignition switch ON.
(b) Check voltage between terminal PSW of A/C control as-
sembly connector and body ground when refrigerant
PSW
pressure is changed.
(+) (-) OK:
I20981 The voltage changes with refrigerant pressure, as
shown in the diagram below.
Low Pressure Cut Side Reference : High Pressure Cut Side
ON (0V)
ON (0V) 2,550 kPa
225 kPa
196 kPa 3,140 kPa
OFF (12V) OFF (12V)
NG Go to step 2.
OK
Proceed to next circuit inspection shown on problem symptoms table (See page DI-697 ). Howev-
er, if DTC 23 is displayed, check and replace A/C control assembly.
2001 SIENNA (RM787U)
Author : Date : 876
DI-723
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check pressure switch.
1 PREPARATION:
Disconnect pressure switch connector.
4 3
CHECK:
(a) Turn ignition switch ON.
2 (b) Check continuity between terminals 1 and 4 of pressure
switch when refrigerant pressure is changed.
OK:
The continuity changes with refrigerant pressure as
I03770 shown below.
Low Pressure Cut Side Reference : High Pressure Cut Side
ON (continuity) ON (continuity)
211 kPa 2,550 kPa
196 kPa 3,140 kPa
OFF (continuity) OFF (continuity)
NG Replace pressure switch.
OK
3 Check harness and connector between A/C control assembly and pressure
switch (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace A/C control assembly.
2001 SIENNA (RM787U)
Author : Date : 877
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