Pontiac FIREBIRD 1972 Service Manual page 188

SECTION 1B
AUTOMATIC TEMPERATURE CONTROL
CONTENTS OF THIS SECTION
B Series Diagnosis
................................ ...... .......
1B-1
ATC Tester J 23678
............................................
1B-1
Diagnostic Procedure
..........................................
1B-2
On-Car Procedure..
.. . ..
..
.. . .. . . .. . . . .
..
.
... . .. . ..
.
.
..
.
. .
. . .
1 B-2
On-Bench Procedure-Programmer
....................
1B-8
G Series Diagnosis
................................................
1B-12
A.T.C. Tester 522684-01
...................................
1B-12
A.T.C. Diagnosis Guide
....................................
1B-13
General Description
..............................................
1B-23
Sensors
................................................................
1B-23
Aspiration
.........................................................
1B-25
B Series Description
..............................................
1B-25
Basic Operation
..................................................
1 B-25
Programmer
.....................................................
1B-27
Amplifier Theory
............................................
1B-28
Electrical Operation
..........................................
1B-30
Vacuum Operation
..
. . .
.
. .
.
. . . . .
.. . . .. . .. . ..
.
. . .
...
. . . . . . . . .
1 B-35
Functional Test
..................................................
1B-39
G Series Description
..............................................
1B-40
Programmer
. .
. .
..
. .. .
..
. .. .
... .
.
.
..
. . ..
.
. .. . .. .
..
. . . . . . . . . . . .
1 B-40
Vacuum Components
.
. .
.
. .
.
. .
. . . . .
.
. . . . . . .
.
. . . .
. .
. . .
.
. . . . .
.
.
1 B-4 1
Control Panel
....................................................
1B-41
Temperature Control
......................................
1 B-41
Blower Control
................................................
1B-41
Electrical Components
. .. . . . . . . . . . .
..
.
.
.. . . .
.
. . . . . . . . .. . .. . .
1 B-42
Air Flow Components
......................................
1B-42
Functional Test
.................................................
1B-42
Operational Instructions
....................................
1B-43
Service Procedures
..............................................
1B-43
In-Car Sensor
.................................................
1B-43
Ambient Sensor and Switch
..............................
1B-43
Electrical Harnesses
..........................................
1B-48
Vacuum Hose Harness
......................................
1B-48
Temperature Door Link to Programmer
..........
1B-48
Control Panel
...................................................
1B-50
Potentiometer-G Series
......................................
1B-50
Temperature Dial-B Series
................................
1B-50
B Series Programmer
........................................
1B-53
Programmer Components..
. . .. . . . .
..
.
.
. . . . .
.
... .. . .. . . . .
1 B-54
G Series Programmer
................ ........................
1B-56
Programmer Amplifier
....................................
1B-57
Gear Inspection
...............................................
1B-57
Programmer Wheel
..........................................
1B-57
Power Resistor
..............................................
1 B-58
Bi-Level Boost Switch
......................................
1B-58
B SERIES ATC DIAGNOSIS
ATC TESTER J 23678
Automatic Temperature Control (ATC) Tester J 23678
(Fig. 1B-1) has been designed and developed to be used in
troubleshooting the Automatic Temperature Control sys-
tem on the B Series. The tester can be used to isolate a
malfunction to the control panel, the sensor string, the
ATC vacuum system or the programmer. If a malfunction
is determined to be in the programmer, the tester can also
be used to completely troubleshoot each component in the
programmer.
A hard rubber, dummy plug, two sizes of vacuum tees and
a supply of hose unions are located in the tester's storage
compartment. The rubber dummy plug is used to plug all
of the vacuum ports on the programmer except the raw
vacuum input for isolating a vacuum problem between the
programmer and the ATC vacuum system. The tees and
unions are used to connect the rubber hose from the tes-
ter's vacuum gauge into the system to make various
vacuum checks.
The wiring harness from the tester is actually a patch-
cable which can be plugged into the programmer and into
- -
the car electrical harness.
Fig. 16-1 ATC Tester J 23678