1991 MITSUBISHI ECLIPSE Service Manual

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting14:f*L3’.INPUT CHECK
a *:;i’ _Input checks should be made when the
auto-cruise’.contr$system. cannot be set and when it is necessary to check.
(when a malfunction related to the auto-cruise control system,
occurs) whether or not the input signals are
no’rmal.
03A0258
NOTE
1. If inspection of self-diagnosis is necessary, confirm diag-nosis code first and conduct input check.’
2. Input check can be conducted by set operations.
Self-diagnosis terminal outputs display patterns.
3. Display codes are displayed only if the circuit is normal
according to the conditions shown in the table on the next
page.(1) The voltmeter is set in the same way as for the
self-diagnosis check.
(2) Turn the ignition switch to ON and switch OFF the CRUISEswitch.
(3) With the SET switch in the ON position, turn the CRUISE
switch ON. Then, within 1
.O second, place the RESUME
switch in the ON position..
(4) Perform each input operation according to the input check
table (on the next page) and read the codes.
(5) Switch the CRUISE switch OFF.

14-124AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
INPUT CHECK TABLE
CheckInput operationiI!eDisplay patterns (output codes)Check results
No.(use with voltmeter)
1SET switch ON21X:Gayitch circuit
2RESUME switch ON2212vRESUME switch cir-cuit
normalov
3Stop light switch ON (brake23
pedal depressed)
;;pl;yht switch
4Driving at approximately to 4024When both No. 4
km/h (25 mph) or higherand No. 5 can be
co,nfirmed, vehicle-.speed sensor circuit
5Driving at less than approx-2512vnormal.
imately 40 km/h (25 mph) or
stopped
ov
61. Clutch switch ON (clutch26Clutch switch inhibi-
pedal depressed) tor switch normal
2. Inhibitor switch ON (shift12vlever to “N” or “P” range)ov
-aIT>
7Throttle position sensor output28
voltage over 1.5V (when theThrottle positionsensor normal
accelerator pedal is pressedmore than half way)
?Idle switch OFF (accelerator29Idle switch normal
pedal depressed)
NOTE
1.Each code will be displayed in an order ofpriority beginning from No. 1.
If there is no display, it is possible that
there is a malfunction of the ECU power-
supply circuit or the SET and/or RESUMEswitch, so check according to check
charts
1,2 and 3.
2. Continue each input operation until the
output code is emitted.
If no output codes are emitted for inputs
even though the display pattern is repe-
ated two or more times, there is a
malfunction of the switch sensor.
3.When each input operation is performed and
the signals for the conditions are received by
the computer, each output code will be
repeatedly displayed in the sequence of
priority for as long as that signal continues.
4.If, during the display of output codes, the
input operation is canceled (if, for example,
the SET switch is set from ON to OFF), the
code will be displayed for one cycle of the
display, but will not be displayed during the
next cycle.
This makes it possible, therefore, to check
the OFF condition (existence of not of a
short-circuit of the input line or the switch).

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
AUTO-CRUISE CONTROL RELATED HARNESSES

1? 3
10 11
Ground Point
--
, ’
112 I$ ii 15r is i72OAO402
1. Idle switch <2.0L DOHC engine>
2. Motor position sensor (Idle switch) engine’>3. Auto-cruise control vacuum pump4. Throttle position sensor5. Starter motor6. Inhibitor switch 7. Auto-cruise control unit8.Junction block9.Self-diagnosis connector10.Clutch switch
11. Stop light switch12.Ignition switch
13.Column switch14. Accelerator switch 15. Power/Economy changeover switch
16. Overdrive switch 17. MPI control unit
18. 4Aff control unit
NOTERefer to P.14-126 for details about the mounting positicjkof
the auto-cruise control unit, etc.Junction Block
NoconnectionFront side
,-To engineroom
To instrumentRear side
)To bodywiringharness

14-126AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
AUTO-CRUISE CONTROL COMPONENTS
Name
Accelerator pedal switch
Symbol
K
Auto-cruise control actuator
Auto-cruise control switch
C
H
IAuto-cruise control unitIE
IAuto-cruise control vacuum pumpIB
IAuto-cruise indicator lightIF
Clutch switch
4 A/T control unit
M
I
NOTE
The “Name” column is arranged in alphabetical order. compartment>
LOCATION
1 Symbol
Idle switchIDInhibitor switch
Motor position
sensor (Idle switch)
ziz&Gy+Throttle position
sensor
Vehicle speed sensor (Reed switch)IG
<1.8L engine>
Motor1position sensor
I.F”l.O,VUUW

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
--
Auto-cruise indicator light
Vehicle speed sensor
(Reed switch)WA0728
l/4’NTj$trol unit-

14-128AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
AUTO-CRUISE CONTROL CIRCUIT
IGNITIONSWITCHtlGl)
GND
r GND $
1
AUTO-CRUISE
CONTROL UNIT
c-01
m
Gz5
idSELF-DIAGNOSIS
CONNECTOR
C-30FRONT SIDE
p&igq
REVERSE SIDE
pl$LzqV
v vI
311195v
izs?I
"'I
E-1 -IF4
L
II
mmm
m
pzr$iiq
c-55
J/Br
m
11 10 c-45
47
2-B ‘--ya’ pliq,
X35-AC-Ul516-NC

AUTO-CRUISE CONTROL SYSTEM - Trdubleshooting
IGNITIONSWITCH(lG1)
J/B
yl8 y17
C”
COLUMN SWITCH
AUTO-CRUISE
CONTROL
0.85-GW
0
20.85-GOPENEEECToR
E
SIBLE1
c-47 ~ ‘
I
J/B
3 c-55
16
AUTO-CRUISEc-01CONTROL UNIT

14-130AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
AUTO-CRUISE
CONTROL-UNITc-01
1 I_-_-_-_-_-_-__II---------lI
i
t
---------------------C-67s
I I
I II I
%Ic!Y
MOTOR;iW'O;;ON
B-03
5
8t
2
i
r!
__------
5c!
ec!
14 C-67
rHROTTLE;gj&ON
t
3-02
19
r
!4
L
%iV
1 IDLE1 SWITCH
E-051
MPICONTROLC-66
UNIT
KXW-AC-UllllM-NC