Pontiac Fiero 1988 Service Manual page 664

LIABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-C1-1 5
CHART C-1D
MAP OUTPUT CHECK
2.8L "P" SERIES (PORT)
I G N I T I O N " O N " , E N G I N E S T O P P E D .
" S C A N " TOOL SHOULD I N D I C A T E A VOLTAGE WITHIN
THE VALUES SHOW?! IN THE CHART BELOW.
O K
O K
• DISCONNECT VACUUM HOSE AT MAP
SENSOR AND PLUG HOSE
• C O N N E C T A H A N D VACUUM PUMP T O
MAP SENSOR
• START E N G I N E
• A P P L Y 34 k P a ( 1 0 " ) OF V A C U U M AND
NOTE VOLTAGE CHANGE. (VOLTAGE
SHOULD BE 1.2 - 2.3 VOLTS L E S S T H A N
S T E P 1.)
N O T O K
REPLACE SENSOR
NO TROUBLE FOUND. CHECK MAP H O S E FOR
LEAKAGE OR RESTRICTION. BE SURE THIS HOSE
S U P P L I E S V A C U U M T O MAP S E N S O R O N L Y .
l
N O T O K
CHECK SENSOR CONNECTION,
IF OK, REPLACE SENSOR.
ALTITUDE VOLTAGE RANGE }
Meters Feet
Below 305 Below 1.000
3.8—5.5V
305— 610 1,000-2.000 3.6—5.3V
610—914 2,000-3.000 3.5—5.1V
914--1219 3,000-4,000 3.3—5.0V
1219-1524 4,000-5,000 3.2—4.8V
1524-1829
5,000-6,000 3.0—4.6V
1829-2133
6,000-7.000 2.9—4.5V
2133-2438 7,000-8.000 2.8—4.3V
2438-2743 8,000-9,000 2.6—4.2V
2743-3048 9,000-10,000 2.5—4.0V
LOW ALTITUDE = HIGH PRESSURE = HIGH VOLTAGE
C L E A R C O D E S A N D C O N F I R M " C L O S E D L O O P " OPERATION A N D N O " S E R V I C E E N G I N E S O O N " L I G H T .
5 - 2 7 - 8 7
* 7 S 3162-SEA