Page text (OCR transcript)
AC–40
AIR CONDITIONING SYSTEM – TROUBLESHOOTING
Blinking Light FRS Pressure Switch Circuit
CIRCUIT DESCRIPTION
The pressure switch sends the appropriate signals to the A/C amplifier when the air conditioning refrigerant pressure drops too low or rises too high. When the A/C amplifier receives these signals, it outputs signals via the ECM to switch OFF the compressor relay and turns the magnetic clutch OFF.
Diagnostic Sensor Check Detecting Condition | Trouble Area
Open in pressure sensor circuit
Abnormal refrigerant pressure
below 196 kPa (2.0 kgf/cm², 28 psi)
over 3,140 kPa (32.0 kgf/cm², 455 psi)
• Pressure switch
• Harness or connector between pressure switch and A/C amplifier
• Refrigerant pipe line
• A/C amplifier
WIRING DIAGRAM
A/C Amplifier
12 V
W-B L-Y 12 L-Y 6 L-Y 14
#2 o——o #1 IB6 IF3 A13
PSW
Pressure Switch
Terminal | 2JZ-GTE | 2JZ-GE
#1 | 1 | 2
#2 | 4 | 1
AC2924