Table of Contents
Advertisement
14 - 40
FUEL SYSTEM
•
SYSTEMS TEST
WARNING:
APPLY
PARKING
BRAKE
AND/OR
BLOCK
WHEELS
BEFORE
PERFORMING
IDLE
CHECK OR ADJUSTMENT, OR ANY ENGINE RUN-
NING T E S T S .
OBTAINING
FAULT
CODES
(1) Connect D R B I I t o t h e diagnostic connector lo-
cated i n t h e engine compartment near t h e SBEC
(Fig. 24).
Fig. 24 Diagnostic Connector
(2) S t a r t t h e engine i f possible, set t h e p a r k i n g
brake a n d t h e n cycle t h e transmission selector a n d
the A/C s w i t c h i f applicable. S h u t off the engine.
(3) T u r n t h e i g n i t i o n switch on, access "Read F a u l t
Code D a t a " . Record a l l fault messages shown on t h e
D R B I I . Observe the check engine lamp on t h e i n s t r u -
ment p a n e l . The l a m p should l i g h t for 3 seconds t h e n
go out ( b u l b check).
F a u l t c o d e e r a s u r e ; access erase f a u l t
c o d e
d a t a
SWITCH TEST MODE
The s w i t c h inputs used by the SBEC have only t w o
recognized states, H I and L O . For this reason, t h e
SBEC cannot recognize the difference between a se-
lected s w i t c h position versus a n open circuit, a short
circuit, o r a defective switch. However, i f a n y one of
these subject switches is toggled, the controller does
have t h e capability to respond, i n d i c a t i n g t h a t i t has
recognized a state change. I f the change is displayed,
i t can be assumed t h a t the e n t i r e switch c i r c u i t to
the SBEC is functional.
OBTAINING SWITCH TEST MODE
SWITCH
TEST
MODE
Z l Voltage Sense
B r a k e Switch
Park/Neutral S w i t c h
A/C S w i t c h Sense
Speed Control On/Off
Speed Control Set
Speed Control Resume
Overdrive Override
Close T h r o t t l e S w i t c h
CIRCUIT ACTUATION TEST MODE
The purpose of t h e c i r c u i t a c t u a t i o n test mode is to
check for t h e proper operation o f o u t p u t circuits of
devices w h i c h t h e SBEC cannot i n t e r n a l l y recognize.
The SBEC can a t t e m p t t o activate these o u t p u t s a n d
a l l o w a n observer t o verify proper operation. Most of
t h e tests available i n t h i s mode provide a n audible or
v i s u a l indication o f device operation (click o f relay
contacts, spray of fuel, etc.) W i t h t h e exception o f a n
i n t e r m i t t e n t condition, i f a device functions properly
d u r i n g i t s test, i t can be assumed t h a t t h e device, i t s
associated w i r i n g , a n d i t s d r i v e r c i r c u i t are i n w o r k -
i n g order.
OBTAINING CIRCUIT ACTUATION TEST
Access "Actuate Solenoid/Rly" or " A c t u a t e O u t -
p u t s "
CIRCUIT ACTUATE TEST DISPLAY
ACTUATE
SOLENOID/RLY
Stop A l l Tests
A u t o Shutdown Relay
A i r S w i t c h Solenoid
Purge Solenoid
E G R Solenoid
A/C C l u t c h Relay
S/C Servo Solenoids
P T U Solenoid
Overdrive Solenoid
A l l
Solenoids/Relays
ACTUATE
OUTPUTS
I g n i t i o n Coil N o . l
F u e l Injector(s) # 1
F u e l Injector(s) # 2
A I S M o t o r Open/Close.
A l t e r n a t o r Field
Tachometer O u t p u t
Shift Indicator L a m p ( M a n u a l Trans O n l y )
Access "Read I n p u t States"
Advertisement
Table of Contents
