Pontiac FIREBIRD 1972 Service Manual page 207

1 B-20
1972 PONTIAC SERVICE MANUAL
TEST 0
(A) WlTH ENGINE RUNNING AT OPERATING TEMPERATVRE,
(B) SYSTEM OFF, BLOWER RANGE SWITCH S E T TO HI, TEMPERATURE CONTROLSET TO MAXIMUM HEAT
(C) USING A 12 VOLT T E S T LAMP OR A VOLTMETER, WlTH ONE PROBE TO GROUND.
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INSERT OTHER PROBE INTO BLACK WlTH DOUBLE ORANGE STRIPE Wl R E O N MASTER RELAY
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T E S T LlGHT LIGHTS
INSERT PROBE INTO BLACK Wl R E O N MASTER RELAY.
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- -
T E S T LIGHT DOES NOT LIGHT
CHECK WlRlNG FROM ALTERNATOR FUSE TO MASTER RELAY.
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T E S T LlGHT LIGHTS
INSERT PROBE INTO SINGLE Wl R E A T CONNECTOR
PLUG O N PROGRAMMER.
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T E S T LlGHT DOES NOT LIGHT
REPLACE MASTER RELAY
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S T LIGHT DOES NOT LIGHT
WlRlNG FROM MASTER RELAY TO PROGRAMMER.
TEST C
(A) WlTH ENGINE RUNNING AND SYSTEM OFF,
(8) CHECK VACUUM CIRCUIT BEWEEN CONTROL PANEL AND AIR INLET DOOR.BROWN HOSE TO DUAL DIAPHRAGM AT DOOR SHOULD HAVE VACUUM.
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VACUUM
REPLACE DIAPHRAGM
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N O VACUUM
CHECK FOR VACUUM A T PORT 1 OF CONTROL PANEL VACUUM VALVE.
TEST
D
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(A) WlTH ENGINE RUNNING AT OPERATING TEMPERATURE,
(8) SYSTEM I N NORMAL. S E T BLOWER RANGE SWITCH TO HI, S E T TEMPEPATURE CONTROL TO MAXIMUM HEAT
(C) USING A I2 VOLT T E S T LAMP OR A VOLTMETER, WlTH ONE P R O B E TO GROUND CHECK T H E FOLLOWING:
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VACVVM
CHECK BROWN HOSE FOR LEAK OR RESTRICTION
LINSERT
OTHER PROBE AT PIN 6 OF6 PIN CONNECTOR OF PROGRAMMR]
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1
NO VACUUM
REPLACE CONTROL PANEL VACUUM VALVE.
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VOLTAGE BELOW 6V S E E PROGPAMMER DIAGNOSIS
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INSERT OTHER PROBE INTO BLACK WlTH DOUBLE ORANGE STRI P E Wl R E O N MASTER RELAY.
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1
T E S T LlGHT LIGHTS
INSERT PROBE INTO BLACK WlTH R E D STRI P E Wl R E ON MASTER RELAY.
LIG"'
CHECK WlRllvG FROM ALTERNATOR FUSE TO WASTER RELAY.
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TEST LIGHT LIGHTS
INSERT PROBE INTO BLACK WlTH SINGLE R E D STRIPE Wl R E AT
PIN 2 OF BLOWER CABLE AT PROGRAMMER.
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TEST LlGHT LIGHTS
INSERT PROBE INTO T H E WI R ES GOING TO TERMINALS 3,
4
OR 5 OF
BLOWER CABLE A T PROGRAMMER UNTIL LlGHT LIGHTS.
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T E S T LlGHT DOES NOT LlGHT
CHECK WlRlNG BETWEEN RELAY AND PROGRAMMER.
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T E S T LIGHT LIGHTS
INSERT PROBE INTO SAME COLOR Wl R E A T RESISTOR BLOCK.
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T E S T LIGHT LIGHTS
T E S T LIGHT DOES NOT LIGHT
INSERT PROBE INTO BLACK WITH DOUBLE ORANGE STRIPE WIRE AT RESISTOR BLOCK
HECK WIRING BETWEEN PROGRAMMER AND RESISTOR BLOCK.
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T E S T LIGHT LIGHTS
INSERT PROBE INTO BLACK WlTH DOUBLE ORANGE STRI P E Wl R E AT BLOWER RANGE SWITCH.
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1
T E S T LIGHT LIGHTS TEST LIGHT DOES NOT LIGHT
INSERT PROBE INTO BROWN WI R E AT BLOWER RANGE SWITCH. CHECK WIRING BETWEEN RESISTOR BLOCK AND BLOWER RANGE SWITCH.
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S T LIGHT LIGHTS
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INSERT PROBE INTO BROWN Wl R E AT BLOWER MOTOR
T E S T LIGHT DOES NOT LIGHT
REPLACE BLOWER RANGE SWITCH.
T E S T LIGHT LIGHTS
HECK BLOWER MOTOR GROUND. IF DEFECTIVE,CORRECT.
IF OK, REPAIR OR REPLACE BLOWER MOTOR.
T E S T LlGHT DOES NOT LIGHT
CHECK WlRlNG BETWEEN BLOWER RANGE SWITCH AND BLOWER MOTOR.
Fig. 16-17 ATC Diagnosis Guide