Pontiac FIREBIRD 1972 Service Manual page 200

AUTOMATIC TEMPERATURE CONTROL 1B-13
/ .
CONNECTOR
/ .
TO IN-CAR SENSOR
IN SERIES WlTH
IN SERIES WlTH
6 PIN CONNECTOR
Fig. 1 B-9
ATC Tester
J 22684-0 1
trol panel potentiometer (See TEMPERATURE LEVER
CALIBRATION).
ATTACHMENT OF TESTER TO CAR
The tester is attached to the system in the following man-
ner:
1. Remove glove compartment (models with bench seat
only).
2. Remove three wiring connections from programmer.
3. The J 22684-51 Automatic Temperature Control
Tester Adapter (Fig. 1B-10) is required for attach-
ment of the J 22684-01 tester to the ATC system.
Attach J 22684-5 1 adapter to ATC system by insert-
ing the appropriate 6-terminal connector and l-ter-
minal connector of the adapter into the mating
connectors on the in-car wire harness and the remain-
ing 6-terminal and 1-terminal connectors of the
adapter into the corresponding connectors of the har-
ness from the programmer.
4. Insert the remaining connector on the in-car harness
into the appropriate connector of tester J 22684-01
and insert the equivalent connector of the tester into
the connector opening on the programmer.
5. Connect the two 10-terminal connectors (3 terminals
are not used) of the tester to the corresponding con-
nectors of the J 22684-5 1 adapter.
TEMPERATURE LEVER CALIBRATION
Before proceeding with the various readings, the tempera-
Fig. 1 B-10 J 22684-5 1 Adapter
ture select lever on the control panel may be calibrated to
insure accuracy. Calibration is accomplished in the fol-
lowing manner:
1. Remove connector containing leads to in-car sensor
at control panel (black with a single light green stripe
and light green).
2. Connect the tester temperature lead assembly (green
lead) to the lead previously removed from the in-car
sensor.
3. Set control panel temperature lever on 75 and set
tester as follows:
a. Manual Control at 50.
b. Switch S-2 to AUTOMATIC.
c. Switch S-1 to CAL.
4. Readjust control panel temperature lever until the
temperature dial cal. centers itself on the meter.
TEST PROCEDURE
The test procedure in its complete form is given on the
cards (Fig. 1B-11) attached to the tester. The instructions
give control panel.setting, tester setting, expected voltme-
ter readings and the suggested service procedure to use if
values are other than expected.
ATC DIAGNOSIS GUIDE
The ATC diagnosis guide can be used several ways. In
conjunction with the diagnosis guide the following illus-
trations may be of great assistance: ATC Wiring Circuit