Diagnostic Aids

In extremely low temperature climate, the A/C pressure signal can drop as low as .3 volt. If this happens, Code 66 will set and disable the A/C system. Clear code and recheck A/C system in a heated garage to determine if outside ambient temperature is cause for Code 66 setting.

Fig 1: Code 66 Schematic (2.2L "L" Body) A/C Pressure Sensor

Fig 2: Code 66 Schematic (2.2L "A" Body) A/C Pressure Sensor

Fig 3: Code 66 Schematic (2.2L "W" Body) A/C Pressure Sensor

Fig 4: Code 66 Schematic (2.2L "J" Body) A/C Pressure Sensor

Fig 5: Code 66 Flow Chart A/C Pressure Sensor