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FUEL SYSTEM
•
BOARD SINGLE
ENGINE
CONTROLLER
(SBEC)
DIAGNOSTIC
TOOL
THROTTLE
POSITION
SENSOR
NEUTRAL
SAFETY SWITCH
DISTANCE
SENSOR
CHECK ENGINE
LAMP
LOCK-UP TORQUE CONVERTER
SOLENOID
HEATED
OXYGEN SENSOR
§
COOLANT
TEMPERATURE
SENSOR
r
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
DISTRIBUTOR
IGNITION
R
m r |
E
U P
C E
A/C ELECTRONIC
CYCLING CLUTCH
SWITCH
A/C LOW
PRESSURE CUTOFF
SWITCH
A C CUTOUT
RELAY
AUTO SHUT-
PART THROTTLE
DOWN RELAY
UNLOCK RELAY
IDLE SPEED CONTROL
(ISC) ACTUATOR
1
THROTTLE
BODY
TEMPERATURE
SENSOR
5.2LAND5.9L
ENGINES
ONLY
EGR, AIR SWITCHING AND
CANISTER PURGE SOLENOIDS
FUEL
INJECTORS
IGNITION COIL
IN-TANK PUMP
ALTERNATOR
SHIFT
INDICATOR
LAMP
J9014-170
LEFT
FENDER
60 WAY ELECTRICAL
CONNECTOR
SINGLE BOARD
ENGINE CONTROLLER
(SBEC)
Fig. 2 Single Board Engine Controller (SBEC)
t i o n i n g selection, transmission gear selection
(auto-
m a t i c transmissions only), and speed control. These
sensors and switches are considered "SBEC I n p u t s " .
The SBEC adjusts i g n i t i o n t i m i n g based upon i n -
puts i t receives from sensors t h a t react to: engine
Fig. 1 Dual-Point Injection Components
R P M
(the d i s t r i b u t o r pick-up), manifold
absolute
pressure,
coolant
temperature,
t h r o t t l e
position,
transmission gear selection (automatic transmission),
vehicle speed, and the idle contact switch. These sen-
sors are considered "SBEC I n p u t s "
The SBEC adjusts idle speed based on i n p u t s i t r e -
ceives from sensors t h a t react to: t h r o t t l e position,
vehicle speed, transmission gear selection,
coolant
temperature and from i n p u t s i t receives f r o m t h e a i r
conditioning clutch switch, brake l i g h t switch, a n d
idle contact switch.
Based on inputs t h a t i t receives, t h e SBEC also
controls i g n i t i o n coil d w e l l and evaporative canister
purge operation. The SBEC also adjusts t h e a l t e r n a -
t o r charge rate t h r o u g h control of the alternator field
and provides speed control operation.
S B E C I n p u t s :
J908D-56
A i r Conditioning Switch
B a t t e r y Voltage
B r a k e L i g h t Switch
Coolant Temperature Sensor
Engine Speed (Distributor Pick-up)
Idle contact switch
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