Diagnostic Channel 52, Graphics Channel 1

A/C compressor switch-off conditions





NOTE:
- If an A/C compressor switch-off condition exists, a segment of the "88.8" display, described below by alpha-numeric code, will illuminate.
- Conditions listed below are causes of A/C compressor switch-off.


a1 - Slippage or blockage, A/C refrigerant high pressure switch, 120x off
b1 - Engine speed less than 200-500 RPM
c1 -
d1 - Engine speed greater than 6000 RPM
e1 -
f1 -
g1 - System function OK 1)

a2 - A/C manually switched off (A/C standby canceled)
b2 - Low voltage
c2 - Kick-down switch (via Transmission Control Module (TCM), compressor off for 12 seconds max.)
d2 - Engine Coolant Temperature (ECT) warning light switch
e2 - A/C refrigerant low pressure switch -F73-
f2 - A/C refrigerant high pressure switch -F118-
g2 - System function OK 1)


1) Segments -g1-, -g2- and -g3- must illuminate simultaneously to indicate system function is OK.

a3 - ECON mode selected
b3 - OFF selected
c3 - Outside (ambient) temperature too low
d3 - Engine management system (compressor will remain off for 3-12 seconds)
e3 - High pressure occurrences more than 30 times
f3 - Ambient temperature sensor at fresh air blower -G109- less than 27 °F (-3 °C)
g3 - System function OK1)
- Decimal point visible; A/C compressor ON
- Decimal point not visible; A/C compressor OFF

1) Segments -g1-, -g2- and -g3- must illuminate simultaneously to indicate system function is OK.