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DI-603
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3W4-1 1
DTC 23 Pressure Switch Circuit
CIRCUIT DESCRIPTION
This pressure switch sends the appropriate signals to the A/C control assembly when the A/C refrigerant
pressure drops too low or rises too high. When the A/C control assembly receives these signals, if outputs
signals via the ECM 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.
circuit
S Harness or connector between pressure switch and A/C con-
S Abnormal refrigerant pressure.
ressure.
23 trol
t l assembly
bl
below 196 kPa (2.0 kgf/cm2. 28 psi)
S Refrigerant pipe line
over 3,140 kPa (32.0 kgf/cm2. 455 psi)
S A/C control assembly
WIRING DIAGRAM
A/C Amplifier
A1
Dual Pressure Switch
9
2 1 O
A30 PSW
W-B
J9
J/C
17 16
W-B A
3E 3E
Center J/B
IF
I09246
2002 4RUNNER (RM887U)
Author : Date : 779
DI-604
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminals PSW of A/C control assembly and body
ground.
PREPARATION:
ON
(a) Install the manifold gauge set (See page AC-19 ).
(-) (b) Remove the A/C control assembly with connectors still
connected.
PSW(+)
(c) Turn ignition switch to ON.
CHECK:
Check voltage between terminals PSW of A/C control assembly
connector and body ground when refrigerant pressure is
BE3840
I00368 I00370 changed.
OK:
The voltage changes refrigerant pressure, as shown
in the chart below.
Low Pressure Cut Side Referaence : High Pressure Cut SIde
ON (0 V) ON (0 V)
225 kPa 2,550 kPa
3,140 kPa
196 kPa
OFF (12V) OFF (12V)
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-586 ).
NG
2002 4RUNNER (RM887U)
Author : Date : 780
DI-605
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check pressure switch.
PREPARATION:
2 1
Disconnect pressure switch connector.
CHECK:
Check continuity between terminals 1 and 2 of pressure switch
when refrigerant is changed.
OK:
The continuity changes with refrigerant pressure as
shown in the chart below.
N17985 Low Pressure Cut Side Referaence : High Pressure Cut SIde
ON (continuity) ON (continuity)
225 kPa 2,550 kPa
3,140 kPa
196 kPa
OFF (no continuity) OFF (nocontinuity)
NG Replace pressure switch.
OK
3 Check harness and connector between A/C control assembly and pressure
switch, pressure switch and body ground (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace A/C control assembly.
2002 4RUNNER (RM887U)
Author : Date : 781
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