1991 MITSUBISHI ECLIPSE ECU

14-118AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
8. CHECKING THE CLUTCH SWITCH CIRCUIT
Auto-cruisecontrolunit9
2ClutchswitchOFF ON
1m11Junction
blockI
13AO370Description of operation
If the clutch pedal is pressed wht driving at a constant speed,
the clutch switch is turned ON and a cancel signal is input to the
control unit and the determined driving speed is canceled
because current flows to the clutch, switch junction block from
the control unit and to ground.Troubleshooting hint
ECU terminal voltage
TerminalSignal
No.
1Clutch switch
t--l--II
ConditionsTerminalvoltage
When the clutch
pedal is depressed.
When the clutchpedal is not de-
pressed.
9. CHECKING THE CIRCUITS RELATED TO THE ACCELERATOR SWITCH OFF FUNCTION
Ignition switchm
& Accel-/Description of operation
The accelerator switch is a switch that detects the operationalstatus of the accelerator pedal; it is one of the sensors of theautomatic, transaxle.Because the status of the accelerator pedal during constant-speed driving is non-operational, the ground circuit (transistorTr2) of the accelerator switch is switched OFF only during
constant-speed driving in order not to interfere wtth the function
of the automatic transaxle.Troubleshooting hint
ECU terminal voltage
TerminalNo.SignalConditionsTerminalvoltaoe
’ 3Control unitAt all times
power supply
9Accelerator
When the accel-ovswitcherator pedal is
depressed.
When the accel-Systemerator pedal is not
depressed.voltage
\lOTEJC: Indicates ON at all time.
13AO3711 Not in operation ) OFF 1 ON (

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting1~~ppGJ”10. CHECKING THE CIRCUITS RELATED TO THE OVERDRIVE-CANCELLATION FUNCTION

block
Ov&rive
Auto-cruisecontrol unitswitch
(16)
A574Al-r
control
unitm
(18)Description of operation
This is a function that cancels the overdrive
fur&on for a
certain fixed period of time, if .during constant-speed travel inoverdrive, the actual vehicle speed decreases to less than the
vehicle speed retained in the memory, and then after a short
time causes the vehicle speed to return to the vehicle speed
retained in the memory.
Overdrive is
cancelled under the following conditions.If, during constant-speed travel, the actual vehicle speed
decreases to 7 km/h (4.4 mph) or more below the set vehicle
speed.
Under either of the conditions described above, the overdrive-
ON signals output from the microcomputer (with the control
unit) are no longer output, and transistor Tr, is switched OFF.
As a result, transistor Tr2 is also switched OFF, causing the
current passing through the overdrive switch of the selector
handle to be interrupted at transistor Tr2, with the result that the
drive is controlled ‘at 3rd gear.Troubleshooting hint
ECU terminal voltage
rerNmdra’SignalConditionsTerminali voltage
104A/T control,
unitWhen the overdrive‘sw$ch IS swrtched$ta;;
11;;tt;iveWhen the overdrives&itch IS switched%‘Gg;

14-120AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
11. CHECKING THE THROTTLE POSITION SENSOR AND IDLE SWITCH CIRCUIT<1.8L Engine>
Throttle
position
sensor
MPI controlunitnw374<2.0L DOHC Engine>
ruiseI unitDescription of operation
“s
The throttle position sensor and idle switch are mounted in the,
motor position sensor or throttle body and are sensors in theMPI system. The idle switch is turned OFF when the accelera-
tor pedal is pressed and ON when it is released. In addition,
throttle position sensor output voltage varies according to thedegree of opening of the throttle valve.Troubleshooting hint

Diagnosis-No. 17

Diagnosis-No. 17
ECU terminal voltageTeKlna’
SignalConditionsTerminal
voltage
4Idle switchWhen accelerator
pedal is pressedXFgr
When acceleratorovpedal is released
5ThrottleWhen accelerator 4.OV-5.5V
position sensorpedal is pressedall the way down
When accelerator 0.48-0.72Vpedal is released

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).

16-12PROPELLER SHAFT - Propeller Shaft
10X0036Mounting boltsLijbro joint bootlOUOO16
clip
position1 ABoot band 1
.:,q,, /
-
10x0001(7)
Install the Lobro joint assembly on the rear propeller
shaft while aligning their bolt holes, and drive the joint
assembly with a hammer using a socket wrench on the
;rinner race for complete installation.-4’
(8) Secure the inner race with the snap ring.
(9) Realign the bolt holes in the boot and Lobro joint
assembly utilizing the mounting bolts and fit the boot onthe joint assembly.
(1O)Secure the boot with the boot band.
Caution
Position the boot band clip on the side opposite tothe bosses which are provided in the boot for
Aventilation. Be sure to remove grease, if present,
’ _from around the bosses. Grease obstructs the
ventilation air passage.
(11)Check that the Lobro joint assembly moves smoothly.
12. INSTALLATION OF CENTER BEARING ASSEMBLY
(1) Apply multipurpose grease to the center bearing front
and rear grease grooves and to the dust seal lip.
Grease: MOPAR Multi-mileage Lubricant
Part No. 2525035 or equivalent(2) Be sure to fit the bearing into the rubber mount groove
on the center bearing bracket.
e;
NOTE-4
Face the bearing dust seal to the side of center bearingbracket mating mark.
(3) Assemble the center bearings to the center propeller
shaft and rear propeller shaft.

PROPELLER SHAFT - Propeller Shaft
NOTEFace the side onto which the center bearing bracket
mating mark is placed and the dust seal is
in,stalled to
the side of the center propeller shaft and
rear.propeller
10X0032
1 OY607
shaft.
11. INSTALLATION OF RUBBER PACKING/lo. COMPAN-
ION FLANGE/S. CENTER YOKE/8. SELF LOCKING NUT
(1) Apply a thin and even coat of the specified grease to therubber packing and fit the packing on the companion
flange.
Specified grease: Repair kit grease(2) Align the mating marks on the center propeller shaft
and center yoke, and the rear propeller shaft and
companion flange, then press fit the center bearing
with self locking nuts, tightening to the specified
torque.
,.
7.INSTALLATION OF LOBRO JOINT ASSEMBLY INSTAL-
LATION BOLTS
(1) Secure the companion flange and Lobro joint assembly
with installation bolts.
(2) Check for grease leakage from the Lobro joint boot andcompanion flange installation parts.
3. JOURNAL/2. JOURNAL BEARING(1) Apply multipurpose grease to the following parts of the
universal joint kit.
@ Shafts and grease sumps of journal
@ Dust seal lips
@ Needle roller bearings
Grease: MOPAR Multi-mileage Lubricant
Part No. 2525035 or equivalent
Caution
Do not apply excessive grease. Otherwise, faulty
fitting of bearing caps and errors in the selection of
snap rings may result.

17-6REAR SUSPENSION - Rear Suspension AssemblyAxle beam
Drive out
BayArbor
Race
BearingSERVICE POINTS OF REMOVAL
Nl7QBh
1.REMOVAL OF REAR SPEED SENSOR ABS>Refer to GROUP
5-Wheel Speed Sensor.
11. REMOVAL OF LATERAL ROD MOUNTING BOLT
(1) Remove the lateral rod mounting bolt.
(2) Secure and hold the lateral rod to the axle beam with
wire, etc.
13. REMOVAL OF SHOCK ABSORBER UPPER ‘MOUNTINGNUTS/14. TRAILING ARM MOUNTING BOLTS/15
REAR SUSPENSION ASSEMBLY(1) Jack up the torsion axle and arm assembly in order to
raise it slightly.
Caution
1.Always insert a wooden block between the jack
receptacle and the axle beam and place the jackat the center of the axle beam.
2. Make sure that the jack does not contact the
lateral rod.(2) Remove the shock absorber
m,ounting nuts and trailing
arm mounting bolts.
(3) Lower the jack slowly, and then remove the rear
suspension assembly.
#-
INSPECTIONNl7QCAL
lCheck the trailing arm and axle beam for deformation or
damage.l Check the torsion bar for damage.
l Check the lateral rod for damage or deformation.
lCheck the bushings for cracking, deterioration, or unusual
wear.
BUSHING REPLACEMENTNl)GTAE
TRAILING ARM BUSHING(1) Drive out the trailing arm bushing as shown in the
illustration.
Caution
The bearing within the special tool should be installed,
as shown in the figure, at the race surface nut side of7
the bearing.

REAR SUSPENSION - Rear Suspension ~Assembly
14AO520
12AOlOQ
SERVICE POINTS OF REMOVALN17GQAOa4. REMOVAL OF CALIPER ASSEMBLY
(1) Remove the lock pin, rotate the calipei
&&e-@blyupward, then remove the caliper assembly and secure
it with wire, etc.
Caution
The lock pin has a special grease appl‘ied tq it, so besure not to wipe it off, and ensure that the lock pin
stays clean.
(2) After removing the caliper assembly,
.cover the guide
pin with a cloth, etc.
8. REMOVAL OF PROPELLER SHAFT INSTALLATION
BOLT AND NUT
Place mating marks on the differential carrier companion
flange and the propeller shaft flange yoke.
NOTEThe mating marks should be used as a reference for
re-installation.9. REMOVAL OF SELF LOCKING NUT
(1) Before removing the self’ locking nuts, support the
differential case with a transaxle jack.
(2) Remove the self locking nuts.
12. REMOVAL OF PARKING BRAKE CABLE AND REAR
SPEED SENSOR INSTALLATION BOLT
(1) Lower the transaxle jack slightly.
(2) Remove the parking brake cable installation bolts.
NOTEThe task may be made easier by increasing the gap
between the body and the
crossmember.