Symptom Related Diagnostic Procedures

SYSTEM DESCRIPTION
Auto amplifier controls compressor operation by ambient temperature, intake temperature, and signal from ECM.

Low Temperature Protection Control
Auto amplifier will turn the compressor "ON" or "OFF" as determined by a signal detected by ambient sensor and intake sensor.
When ambient temperatures are greater than 1.7 °C (35 °F), the compressor turns "ON". The compressor turns "OFF" when ambient temperatures are less than -1 °C (30 °F).
When ambient temperature is lower than 13 °C (55 °F) and the temperature detected by intake sensor is less than 7 °C (45 °F), the compressor turns OFF after receiving a signal from ECM.

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DIAGNOSTIC PROCEDURE

SYMPTOM: Magnet clutch does not engage after performing Preliminary Check 6.

COMPONENT INSPECTION







Triple-Pressure Switch







A/C Relay
Check continuity between terminal Nos. (3) and (5)
If NG, replace relay.