1991 MITSUBISHI ECLIPSE sensor

FUEL SYSTEM - Service Adjustment Procedures <1.8L Engine>14-43
(14)lf it is out of specification, adjust by loosing the throttle
position sensor mounting screws and rotating the throttle
position sensor. After adjustment, tighten the screws
firmly.
NOTEClockwise rotation of the throttle position sensor increases
the output voltage.
Throttle position
sensor
t-/ /I
(15)Set the ignition switch at OFF.
(16)Adjust the free play of the accelerator cable.
(17)Reconnect the connectors of the idle speed control servo.
(18)Remove the voltmeter.
(19)Start the engine and check that the engine is running at thecurb idle speed.
Curb idle speed:
700f 100 rpm
(20)Set the ignition switch at OFF, disconnect the negative
battery cable and reconnect it more than
10 seconds later
(By doing so, the memory storing the diagnosis data duringthe idle speed control adjustment is cleared.)
(21)Restart the engine, let it run at idle for about 5 minutes, andcheck that the engine is running in good idle quality.
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
NllRCK
(1) Warm up the engine, then stop it.
(2) Remove the air intake hose from the throttle body.
(3) Spray cleaning solvent into the valve through the throttle
body intake port and leave it for about 5 minutes.
(4) Start the engine, race it several times and idle it for about 1minute. If the idling speed becomes unstable slightly open
the throttle valve to keep the engine running.
(5) If the throttle valve deposits are not removed, repeat steps
(3) and (4).
(6) Attach the air intake hose.
(7) Disconnect the battery terminal for
10 seconds or more,
and then reconnect it.
(8) Adjust the idle speed control and throttle position sensor.

14-50FUEL SYSTEM - Service Adjustment Procedures <2.0L Engine>THROllLE
POSITION SENSOR ADJUSTME!-T’“.
(1) Slacken the accelerator cable enough.
6FU13%(2) Connect a digital voltmeter between terminal 19 (throttle
position sensor output voltage) of the engine control unit
and terminal 24 (ground).
(3) Set the ignition switch at ON (do not start the engine) and
check that the output voltage from the throttle position
sensor is as specified.
Standard value:
0.48-0.52 V(4) If it is out of specification adjust by loosening the throttle
position sensor mounting screws and rotating the throttle
position sensor. After adjustment, tighten the screws
firmly.
NOTE1. Clockwise rotation of the throttle position sensor
increases the output voltage.
2.For information concerning the removal and installationof the throttle body, refer to
P.14-89.(5) Set the ignition switch at OFF.
(6) Adjust the free play of the accelerator cable.
(7) Remove the voltmeter.
(8) Disconnect the negative battery cable, and reconnect it
more than
10 seconds later. (By doing so, the memory
storing the diagnosis data during the idle speed control
adjustment is cleared.)

14-52FUEL SYSTEM - Service Adjustment Procedures <2.0L Engine>
IDLE POSITION SWITCH ADJUSTMENT
Caution
N14UDAThe idle position switch has been adjusted by the manu-
facturer.Do not, therefore, disturb the setting of the idle-position
switch.
If the setting is disturbed as a result of carelessness, or if
the idle-position switch is replaced, make the necessary
setting as described below.
(1) Sufficiently loosen the tension of the accelerator cable.
(2) Disconnect the connector of the idle position switch (fixed
speed adjusting screw).
(3) Loosen the lock nut of the idle position switch (fixed speed
adjusting screw).
(4) Sufficiently loosen the idle position switch by turning it in
the counterclockwise direction and fully close the throttle
valve.Caution
Be sure to completely close the throttle valve.
(5) Connect a tester (ohm range) between the switch’s
terminal and the body.
(6) Turn down the idle position switch until it enter the “ON”
state where the switch establishes a continuity to body
(this point is called “touch point”). Turn the switch down
15/16 of a turn more from that point.
NOTEThe “touch point” refers to the point where the throttle
valve begins opening.
(7) While holding the idle position switch to make sure that it
does not turn, tighten the lock nut.
(8) Adjust the accelerator cable.
(9) Adjust the basic idle speed. (Refer to P.14-48.)
(lO)Setting the throttle position sensor.
FUEL PRESSURE TESTN14FNAO(1) Reduce the fuel pressure in the fuel line.
(Refer to
P.14-44.)(2) Disconnect the high pressure fuel hose from the delivery
pipe.Caution
Cover the hose connection with shop towel to prevent
splash of fuel that could be caused by residual pressurein the fuel pipe line.
(3) Remove the throttle body stay.

IL SYSTEM -MPI Svstem InsDection 4.8L Enaine>14-56FUE- _ ~-~~~~~ ~~ ~,~.
MPI SYSTEM INSPECTION <1.8L Engine>COMPONENTS
LncAT’n”’Ignition timing adjustment terminal
Fuel
ourno check terminal
Nl4PAAMAir-flow sensor
Intake air temperature sensor
Barometric pressuresensorCoolant temperature
sensornhibitor switch (A/T)
Inhibitor switch
-xT==-TL--==- IOlAO422
/Pxygen sensor

FUEL SYSTEM - MPI System Inspection <1.8L Engine>
EGR control solenoid valve
[Calif. only]Purge control solenoid valve
Purge control
-/Y solenoid valve_
ISC servo.Idle Dositionswitch, MPS
Crankshaft angle sensor, TDC sensor
EGR temperature sensor
[Calif. only]
Y-4
16A0802 \
)n ject 0 r 1ture sensor
\I/OlA0407
@Power
steermg fluld pressure switch
ressure switch

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.)