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