Pontiac Fiero 1988 Service Manual page 438

D R I V E A B I L I T Y
AMD
E M I S S I O N S -
FUEL INJECTION
6 E - 1 1
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OPERATING CONDITIONS SENSED
A/C "On* m "Off"
Engine Coolant Temperature
Engine crank signal
Exhaust Oxygen(0
2
) Sensor
Distributor Reference
• Crankshaft Position
• Engine Speed (RPM)
Manifold Absolute Pressure (MAP)
Park Neutral Switch (P/N) Position
System Voltage
Throttle Position (TPS)
Transmission Gear Position
Vehicle Speed (VSS)
Fuel Pump Voltage
Power Steering Pressure
Mass Air Flow (MAF)
Manifold Air Temperature (MAT)
EGR Vacuum
Engine Knock (ESC)
Differential Pressure (VAC)
A/C High Side Pressure
ELECTRONIC
(ENGINE)
CONTROL
MODULE
(ECM)
SYSTEMS CONTROLLED
© Air M a n a g e m e n t
f " j Canister Purge
o Exhaust Gas Recirculation (EGR)
© Ehttmmk Spark Timing (EST)
® P o d C o n t r o l
• Idle A i r C o n t r o l (IAC)
© Transmission Converter Clutch (TCC)
o r Shift L i g h t
® electric Fuel Pump
o A i r C o n d i t i o n i n g
© Engine C o o l i n g Fan
® Diagnostics
©
"Service Engine Soon" Light
o
Diagnostic T e r m i n a l (ALDL)
o Data O u t p u t (ALDL)
o Electronic Spark C o n t r o l (ESC)
© Earlf Fuel E v a p o r a t i o n (EFE)
o idle s^eed (ISC ILC.)
* All systems n o t used o n all e n g i n e s .
6-1-87
*7S 3429-61
Figure 4 - ECM Operating Conditions Sensed and Systems
Controlled
driveaway. This system Is not used on all engines and
may or may not be controlled by the ECM.
E x h a u s t Gas R e c i r c u l a t i o n ( E G I )
The EGR system uses a valve to feed a small
amount of exhaust gas back into the intake manifold
to control formation of NO
x
.
T r a n s m i s s i o n C o n v e r t e r C l u t c h ( T C C )
The TCC Is ECM controlled and Is used on all
engines with an automatic transmission. This system
reduces slippage losses in the torque converter by
coupling the engine flywheel to the output shaft of the
transmission.
Shift L i g h t C o n t r o l
The ECM controls the shift light on some manual
transmission vehicles to indicate the best shift point
for maximum fuel economy. This control is not on all
applications.
A / C C l u t c h C o n t r o l
The ECM may control the A/C clutch on the
compressor to improve idle quality. This control is not
on all engines.
Electric C o o l i n g F a n C o n t r o l
#
Under certain conditions, the ECM may control
the electric cooling fan to cool the engine and A/C
condenser. At cruising speed, the ECM may turn the
fan off for better fuel economy. This control is on
transverse engine front wheel drive vehicles.
P o s i t i v e C r a n k c a s e V e n t i l a t i o n ( P C V ) o r
C r a n k c a s e V e n t i l a t i o n { € ¥ )
The PCV or CV system passes crankcase vapors
into the intake manifold. This system is not controlled
by the ECM and is used on all engines.
T h e r m o s t a t i c A i r C l e a n e r ( T H E R M A C )
The THERMAC system regulates heated air
through the air cleaner to provide uniform inlet air
temperature, which gives good driveability under
various climatic conditions. This system is not
controlled by the ECM.
ABBREVIATIONS
AUP
GLOSSARY
O F T E R M S
Abbreviations used in this section are listed below
in alphabetical order with an explanation of the
abbreviation. There are some variations in the use of
periods and in capitalization (as mph, m.p.h., Mph,