Jeep 1996 Grand Cherokee Service Manual - page 1409
CLEARING FAULT CODES
Current faults are cleared whenever the problem
goes away. To clear a historical fault, depress and
hold either the A/C or Recirc button for at least three
seconds. The faults have been cleared when two hor-
izontal bars appear in the display.
INPUT CIRCUIT TESTS
In the Input Circuit Test mode, the status of input
circuits can be viewed and monitored. If a failure
occurs within an input circuit the controller will dis-
play a “?” for unknown values, “OC” for an open cir-
cuit, or “SC” for a short circuit.
(1) To begin the Input Circuit Tests you must be in
the Select Test mode.
(2) With 00 displayed in the Test Selector and no
stickman, turn the temperature rotary control until
the test number you are looking for appears in the
Test Selector display. See the Circuit Testing chart
for a listing of the test numbers, test items, test
types, system tested, and displayed values.
(3) To see the circuit input values, depress the A/C
or Recirc button. The values displayed will represent
the input seen by the ATC controller.
OUTPUT CIRCUIT/ACTUATOR TESTS
In the Output Circuit/Actuator Test mode, the out-
put circuits can be viewed, monitored, overridden,
and tested. If a failure occurs in an output circuit,
test the circuit by overriding the system. Test the
actuator through its full range of operation. When
the override control has been activated, the display
will be flashing. The Test Selector will display feed-
back information about the output circuit being
tested.
(1) To begin the Output Circuit/Actuator Tests you
must be in the Select Test mode.
(2) With 00 displayed in the Test Selector and no
stickman, turn the temperature rotary control until
the test number you are looking for appears in the
Test Selector display. See the Circuit Testing chart
for a listing of the test numbers, test items, test
types, system tested, and displayed values.
(3) To see the output value, depress the A/C or
Recirc button. The values displayed will represent
the output from the ATC controller.
(4) To enter the actuator test, depress the A/C or
Recirc button. The display will blink, indicating you
are in the actuator test mode. Manual tests are those
in which you will have to depress and hold the A/C or
Recirc button to control the output. Automatic tests
are those in which you will have to depress the A/C
or Recirc button once to generate the output.
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HEATING AND AIR CONDITIONING
ZJ
DIAGNOSIS AND TESTING (Continued)