Diagnostic Aids

The following conditions must be met in order for the ECM to turn on the compressor clutch:

• Battery voltage is between 9-16 volts.
• Engine coolant temperature (ECT) is less than 123°C (253°F).
• Engine speed is less than 5300 RPM.
• Engine speed is more than 600 RPM.
• A/C high side pressure is between 2951-310 kPa (428-44 psi).
• Throttle position is less than 100 percent.
• Evaporator temperature is greater than 0°C (32°F).
• ECM does not detect excessive torque load.
• ECM does not detect insufficient idle quality.