turn signal MITSUBISHI ECLIPSE 1991 Service Manual

BRAKES - Anti-lock Braking System Troubleshooting5-23
E-5Abnormality of valve relay drive circuit
~- [Explanation]Ii ;.
\jVhen the ignition switch is turned ON, the ABSnormal. In addition, normally it monitors whether qrECU switches the valve relay OFF and ON for annot there is power in the valve power monitor line
initial check, compares the voltage of the signal tosince the valve relay is normally ON. Then, if the
the valve relay and valve power monitor line voltagesupply of power to the valve power monitor,line is
tocheck whether the valve relay operation isinterrupted, the warning light illuminates.
IGNITIONMiN&USIBLESWITCH(IGI)
ECU
1When the valve relay is
checked, are the following
conditions found?Valve relay malfunction
I
No. 85-No. 86:resistancevalue 60-120 QNo. 30-No. 87a: continuity
No. 30-No. 87: No continui-
tYWhen battery voltage is ap-
plied between terminals
No. 86 and No. 85 grounded.No.
30-No. 87: continuity
No. 30-No. 87a: no continui-
Install the valve relay and
remove the HU connec-
t the HU harnesandremove the ECU con-Is there continuity between
body connector terminal No.
22 and ground?
Yes
Valve relay drive circuit is
normal.

BRAKES - Anti-lock Braking System Troubleshooting5-39
E-6Abnormality of valve relay drive circuitI
j-a [Explanation]When the ignition switch is turned ON, the ABSnormal. In addition, normally it monitors whether or
ECU switches the valve relay OFF and ON for annot there is power in the valve power monitor line
initial check, compares the voltage of the signal tosince the valve relay is normally ON. Then, if the
the valve relay and valve power monitor line voltagesupply of power to the valve power monitor line is
to check whether the valve relay operation is
interrupted, the warning light illuminates.
IGNITIONMAIN FUSIBLESWITCHLINK @W-31)When the valve relay is
checked, are the followingconditions found?No.85-No.86:resistancevalue 60-120 Q
No.30-No.87a: continuityNo.30-No.87: No continui-
When battery voltage is ap-plied between terminals
No.86 and No. 85 grounded.
No. 30-No. 87: continuity
No.
30-No. 87a: no continui-
tyremove the HU connec-
NoValve relay malfunction
Replace valve relay.
IConnect the HU
remove the ECU con-
I Yes
IValve relay drive circuit isnormal.I

14-58FUEL SYSTEM -MPI System Inspection <1.8L Engine>
MALFUNCTION INDICATOR LIGHTNWQAB
Among the self-diagnosis items, a malfunction indicator light
comes on to notify the driver of the emission control items
when an irregularity is detected.
However, when an irregular signal returns to
notmal ‘and the
engine control unit judges that it has returned to normal, the
malfunction indicator light goes out.
Moreover, when the ignition switch is turned off, the light goes
out. Even if the ignition switch is turned on again, the light doesnot come on until the irregularity is detected.
Here, immediately after the ignition switch is turn on, the
malfunction indicator light is lit for 5 seconds to indicate that
the malfunction indicator light operates normally.
Items indicated by the lightening malfunction light
Engine control unit
Oxygen sensor
Air-flow sensor
Intake air temperature sensor
Throttle position sensor
Motor position sensor
Engine coolant temperature sensor
Crank angle sensor
No. 1 cylinder TDC sensor
Barometric pressure sensor
Ignition timing adjustment signal
Injector
Fuel pump
EGR system Caution
The malfunction indicator light lights up when the ignition
timing adjustment terminal is short-circuited
,‘t’o ground.
Consequently, it lights up ,when the ignition timing
adjustment is grounded when adjusting ignition timing,
but in this case there is no abnormality.
MALFUNCTION INDICATOR LIGHT INSPECTlON
When turning on the ignition switch, check that the light comes
on.
NOTElf the light does not come on, check the harness and light for
breakage.SELF-DIAGNOSIS
Nl4PMFaThe engine control unit monitors the input/output signals
(some signals at all times and the others under specified
conditions) of the engine control unit.

FUEL SYSTEM - MPI System inspection <1.8L Engine>14-59
--..When it is noticed that an irregularity has continued for a
specified time or longer from when the irregular signal is
initially monitored. Passing a certain number, the engine
control unit judges that an irregularity has occurred, memorizesthe malfunction code, and outputs the signal to the
self-diagnosis output terminal.
There are 14 diagnosis items, and the diagnosis results can beread out with a voltmeter.
Moreover, since memorization of the malfunction codes is
backed up directly by the battery, the diagnosis results are
memorized even if the ignition key is turned off. The malfunc-
tion codes will, however, be erased when the battery terminal
or the engine control unit connector is disconnected.
Caution
If the sensor connector is disconnected with the ignition
switch turned on, the malfunction code is memorized. In
this case, disconnect the battery terminal’
(-) for 10seconds or more, and the diagnosis memory will be
erased.The 14 diagnosis items are provided as follows, and if plural
items are activated, they are all indicated sequentially from thesmallest code number.
perature sensor
CautionFor the malfunction code of the ignition timing adjustment
signal, the light for the ignition timing adjustment terminal
lights up when short-circuited to ground.
Consequently, it is output when the ignition timing
adjustment is grounded when adjusting ignition timing,
but in this case there is not abnormality.
CHECK PROCEDURE (SELF-DIAGNOSIS)N14PCAElPrecautions for Operation
(1) When battery voltage is low, no detection of failure is
possible. Be sure to check the battery for voltage and otherconditions before starting the test.
(2) Diagnosis item is erased if the battery or the engine controlunit connector is disconnected. Do not disconnect the
battery before the diagnosis result is completely read.
(3) After check and correction are over, disconnect ground
cable for
10 seconds or more from negative terminal of
battery and connect it again to make sure that failure code
is erased.

14-60FUEL SYSTEM - MPI Svstem lnwection <1.8L Engine>
7 MPI
diagnosis
LGround
DIAGNOSIS CHART (FAULT TREE)output
preference
orderDiagnosis item
1Engrne control
unit
2 2Oxygen sensor Oxygen sensor
3 3Air flow sensor Air flow sensor
4 4Intake air Intake airtemperature sensor temperature sensor
5 5Throttle position Throttle positionsensor sensor
6 6Motor position Motor positionsensor sensor
INSPECTION PROCEDURE - USING VOLTMETERN14PCAGl
(1) Connect an analogue voltmeter to the self-diagnosis con-,z
nectar.
‘~(2) Turn ignition switch to ON, and indication of engine control
unit memory contents will immediately start. If the system
is in normal condition, pointer of voltmeter indicates normalpattern. If any abnormality is in memory, the pointer of
voltmeter will deflect, indicating abnormal item as de-
scribed in “Diagnosis Chart”.
After recording the abnormal item, check and repair each
part according to the check items in “Diagnosis Chart”.
(3) If the defective parts have been repaired, disconnect the
negative terminal of battery cable for
10 seconds or more
and connect it again to make sure that the abnormal code
has been erased.
N14PRACDiagnosis code
Output signal pattern
:1
12A0104
12A0104
12A0104
12A0104
:JJlJJ--
12A0104
LII
12A0104
No.
-
11Retained
12Retained
14
15MemoryCheck item (Remedy)
-(ll#ace engine control
l Harness and connectorl Fuel, pressurel Injectors
(Replace if defective)
l Intake air leaks0 Oxygen sensor
l Harness and connector
(If harness and connector
are normal, replace airflow sensor assembly.)

14-72FUEL SYSTEM - MPI Svstem InsDection <2.0L DOHC Engine>
MALFUNCTION INDICATOR LIGHTAmong the self-diagnosis items, a malfunction indicator light
comes on to notify the driver of the emission control items
when an irregularity is detected.
However, when an irregular signal returns to normal and the
engine control unit judges that it has returned to normal. the
malfunction indicator light goes out.
Moreover, when the ignition switch is turned off, the light goes
out. Even if the ignition switch is turned on again, the light doesnot come on until the irregularity is detected.
Here, immediately after the ignition switch is turn on, the
malfunction indicator light is lit for 5 seconds to indicate that
the malfunction indicator light operates normally.
I--l
klfunctionindicator light
Items indicated by the lightening malfunction light
Engine control unit
Oxygen sensor
Air flow sensor
Intake air temperature sensor
Throttle positron sensor
Engrne coolant temperature sensor
Crank angle sensor
Top dead center sensor
Barometric pressure sensor
Detonatron sensor
Injector
Fuel pump
EGR
Ignition co11
/
iMALFUNCTION INDICATOR LIGHT INSPECTION
When turning on the ignition switch, check that the light comes
on.
NOTEIf the light does not come on, check the harness and light for
breakage.

FUEL SYSTEM - MPI System Inspection <2.0L DOHC Engine>
SELF-DIAGNOSIS14-73
N14PAAEThe engine control unit monitors the input/output signals
(some signals at all times and the others under specified
conditions) of the engine control unit.
When it is noticed that an irregularity has continued for a
specified time or longer from when the irregular signal is
initially monitored. Passing a certain number, the engine
control unit judges that an irregularity has occurred, memorizesthe malfunction code, and outputs the signal to the
self-diagnosis output terminal.
There are 14 diagnosis items, and the diagnosis results can beread out with a voltmeter.
Moreover, since memorization of the malfunction codes is
backed up directly by the battery, the diagnosis results are
memorized even if the ignition key is turned off. The malfunc-
tion codes will, however, be erased when the battery terminal
or the engine control unit connector is disconnected.
CautionIf the sensor connector is disconnected with the ignition
switch turned on, the malfunction code is memorized. In
this case, disconnect the battery terminal
(-) for 10seconds or more, and the diagnosis memory will be
erased.The 14 diagnosis items are provided as follows, and if plural
items are activated, they are all indicated sequentially from thesmallest code number.
arometnc pressure sensor
CHECK PROCEDURE (SELF-DIAGNOSIS)Precautions for OperationN14PCAE2(1) When battery voltage is low, no detection of failure is
possible. Be sure to check the battery for voltage and otherconditions before starting the test.
(2) Diagnosis item is erased if the battery or the engine controlunit connector is disconnected. Do not disconnect the
battery before the diagnosis result is completely read.
(3) After check and correction are over, disconnect ground
cable for 10 seconds or more from negative terminal of
battery and connect it again to make sure that failure code
is erased.

FUEL SYSTEM- MPI Svstem InsDection <2.0L DOHC Engine>
MPI
diagnosis
I Ground
INSPECTION PROCEDURE - USING VOLTMETERN14PCAGZ
(1) Connect an analogue voltmeter to the self-diagnosis con-
nector.(2) Turn ignition switch to ON, and indication of engine control
unit memory contents will immediately start. If the system
is in normal condition, pointer of voltmeter indicates normalpattern. If any abnormality is in memory, the pointer of
voltmeter will deflect, indicating abnormal item as de-
scribed in “Diagnosis Chart”.
After recording the abnormal item, check and repair each
part according to the check items in “Diagnosis Chart”.
(3) If the defective parts have been repaired, disconnect the
negative terminal of battery cable for
10 seconds or more
and connect it again to make sure that the abnormal code
has been erased.
DIAGNOSIS CHART (FAULT TREE)NlQPRADoutputDiagnosis codeIreference
Dragnosrs Item- Check item (Remedy)
orderOutput signal patternNo.Memory
1Engine controlunit- - W$$ace engine control: I
12A0104
2Oxygen sensor11Retainedl Harness and connector:-J-l-J-0 Oxygen sensor
o Fuel pressure
0 Injectors(Replace if defective)
12A0104l Intake air leaks
3Air flow sensor
:-rLJL ‘*
Retainedl Harness and connector
(If harness and connector
are normal, replace airflow sensor assembly.)
12A0104
4Intake au
J--lNlL l3
Retarnedl Harness and connectortemperature sensor Hl Intake air temperature
sensor
12A0104
5Throttle postron
:n l4
Retainedl Harness and connector
sensorl Throttle position sensorl Idle position switch
17A0104
6Engine coolant
:nn 2’
Retainedl Harness and connectortemperature sensorl Engine coolant temper-
ature sensor
12A0107

14-114AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
CHECK CHART
1I. CHECKING THE CONTROL UNIT POWER SUPPLY CIRCUIT
Ignition
switch
I
IAF”7Junction 8
block
tI3
Crurse-controlswitch
OFFDescription of operation
When the cruise control switch (CRUISE) is switched ON whilethe ignition switch is ON, current flows to the ignition switch(IG,), to fuse No.(ll) of the junction block, and to thecruise-control switch (MAIN switch), the control unit, and to
ground.When the ignition switch is turned OFF, the MAIN switch in thecruise control switch is also turned OFF.Troubleshooting hint
ECU terminal voltage
TerminalSignal
No.ConditionsTerminalvoltage
t2Control unitWhen the cruise-System
power supplycontrol switchvoltage
(CRUISE) isswitched ON.
8, 14Control unitAt all timesovground
NOTE+: The connector Nos. in Section “AUTO-CRUISE CONTROL
RELATED HARNESSES” and the connector names in the
junction block are represented.
(Applicable on the next page and subsequence.)13AO3632. CHECKING THE SET SWITCH
Auto-cruisecontrol unitDescription of operation
When the SET switch is switched ON (at the vehicle speed
desired to be maintained, and with the CRUISE switch of the
cruise-control switches ON) that vehicle speed is maintained as
a constanf speed.
Furthermore, the constant speed is gradually reduced (the
“coasting” feature) when the SET switch is pressed and held
while the vehicle is traveling at the previously set constant
speed, and, when the SET switch is released, the vehicle then
maintains that newly set constant speed (the speed at whichthe SET switch was released).
Current flows to the control unit, the cruise control switch
(“SET”), and to ground.Troubleshooting hint
Diagnosis-No. 15 (automatically
cancelled)ECU terminal voltage
1 Terrrnal 1 Signal 1 ConditionsrEl
13AO364

14-116AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
5. CHECKING THE AUTO-CRUISE CONTROL VACUUM PUMP
Ignitionswitch (IG,)I
SET
ON
Cruise-controlswitchDescription of operation
Hold modeWhen the SET switch is turned ON by the driver turning the
CRUISE switch ON when a determined speed is reached, thecontrol unit receives a set signal, and turns the auto-cruise
vacuum pump motor ON. After the constant speed is reached,
the motor, control valve and release valve are repeatedly turned
ON and OFF according to driving conditions.
Acceleration mode
When the RESUME switch is pressed, the control unit receives
a RESUME signal and it not only turns the auto-cruise vacuum
pump motor ON but also turns the control valve and releasevalve ON (valve is closed).
Deceleration mode
When the SET switch is held down, the control unit receives a
set signal and
it not only turns the auto-cruise vacuum pumpmotor and control valve OFF (valve is opened) but also turns the
release valve ON (valve is closed).
Release modeWhen the CRUISE switch is turned OFF, the control unit
receives a cancel signal and it not only turns the auto-cruisevacuum pump motor OFF but also turns the control valve and
release valve OFF (valve is opened).Troubleshooting hint
Diagnosis-No. 11 (automatically
cancelled)ECU terminal voltage