- Open in pressure sensor circuit
-
Abnormal refrigerant pressure
below 196 kPa (2.0 kg/cm 2 , 28 psi)
over 3,140 kPa (32.0 kgf/cm 2 , 455 psi)
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM0000018N2004X |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM: 23; Pressure Switch Circuit; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
23 |
Pressure Switch Circuit |
DESCRIPTION
The pressure switch sends the appropriate signals to the A/C amplifier when the A/C refrigerant pressure drops too low or rises too high. When the A/C amplifier receives these signals, it outputs signals via the A/C amplifier to switch OFF the compressor relay and turns the magnetic clutch OFF.
|
DTC No. |
Detection Item |
Trouble Area |
|---|---|---|
|
23 |
|
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK AIR CONDITIONING AMPLIFIER |
(a) Install the manifold gauge set.
(b) Turn the ignition switch ON.
(c) Check the voltage between terminals PSW (A49-8) and GND (A49-12) of the A/C amplifier connector when A/C gas pressure changes.
OK:
The voltage changes with gas pressure, as shown in the diagram below.
HINT:
However, if DTC 23 is displayed, check and replace A/C amplifier.
| OK |
|
|
|
2. |
CHECK PRESSURE SWITCH |
(a) Disconnect the A5 pressure switch connector.
(b) Turn the ignition switch ON.
(c) Check continuity between terminals 1 and 2 of the pressure switch when A/C gas pressure changes.
OK:
The continuity changes with gas pressure as shown below.
| NG |
|
|
|
3. |
CHECK WIRE HARNESS (PRESSURE SWITCH - AIR CONDITIONING AMPLIFIER) |
| NG |
|
| OK |
|
|
|