Diagnostic Aids

The following conditions must be met in order to turn on the A/C compressor:

• Battery voltage is between 9-18 V.
• Engine coolant temperature is less than 124°C (255°F).
• Engine speed is greater than 600 RPM.
• Engine speed is less than 5 500 RPM.
• A/C high side pressure is between 269-2, 929 kPa (39-425 PSI).
• Throttle position is less than 100%.
• Evaporator temperature is greater than 3°C (38°F).
• ECM does not detect excessive torque load.
• ECM does not detect insufficient idle quality.
• The ambient temperature sensor senses above 1°C (34°F).
• Blower motor is ON.