Code 67, A/C Pressure Sensor: Notes

PCM determines when A/C clutch is engaged by monitoring A/C status line. If A/C pressure does not increase by at least 4 psi when A/C clutch is turned on, Code 67 will set.

1. Code 67 will set if PCM does not detect an A/C pressure change when A/C clutch has been cycled.
2. If relay power feed is intermittent, A/C clutch status terminal may not detect voltage when A/C is commanded on.
3. Check A/C electrical harness for problems. If A/C clutch status line becomes intermittently open or shorted while compressor is on, PCM will be wrongly detecting A/C clutch going on and off. When this occurs and clutch remains engaged, PCM will not detect pressure change and a Code 67 will be set.
4. If A/C compressor clutch status circuit is intermittently open or shorted while compressor is on, PCM will wrongly detect compressor cycling on and off, but PCM will detect no pressure change and a Code 67 will set.