sensor MITSUBISHI GALANT 1989 Service Owners Manual

FUEL SYSTEM - Troubleshootinn13-125
Dta,i;o;ic On-board
diagnostic
code No. item Diagnostic content
Major causeRemarks (trouble
phenomenon, etc.)
24
Vehicle
speed
sensor
(reed
switch) During acceleration of engine
(1) The vehicle speed sensor is The engine
revolution speed of 3,000 rpm troubled.sometimes cuts off
or more, the signal voltage of (2) Open-circuit, short-circuit or when stopping afte
the vehicle speed sensor does improper connector
contact
deceleration.
not vary (to be high/low). occurs in the vehicle speed
sensor circuit.
(3) The engine control module is troubled.
25Barometric (1) The signal voltage of the (1) The barometric pressure sensor l Unstable idling*
pressure barometric pressure is troubled. l Improper
sensor sensor is
4.5V or higher.(2) Open-circuit, short-circuit or acceleration*
(2) The signal voltage of the improper connector contact0 Improper start*
barometric pressure occurs in the barometric
sensor is
0.2V or lower. pressure sensor circuit.
(3) The engine control module is troubled.
36Ignition
timing
adjusting
signal The ignition timing adjusting
(1) The ignition timing adjusting
l Improper
signal line is short-circuited to signal line is short-circuited toacceleration
the ground. the ground.l Engine overheat
(2) The engine control module is troubled.
41Injector Injector is not continuously
driven for 4 seconds during
engine cranking or idle
operation. (1) The injector is troubled.
(2) Open-circuit, short-circuit or improper connector contact
occurs in the injector sensor
circuit. l Unstable idling
l Improper acceleration
0 improper start
(3) The engine control module is troubled.
43EGRDuring engine running after (1) The EGR valve is not opened. l Deterioration of exhaust gasnia>(1) The EGR amount is small.EGR valve control is excessively
purifying
(The signal voltage of the low. performance
EGR temperature sensor (3) The EGR solenoid is troubled.
is excessively high.) (4) The EGR temperature sensor is
(2) The signal voltage of the troubled.
EGR temperature sensor (5) Open-circuit, short-circuit or
is 0.1 V or less.improper connector contact
occurs in the EGR temperature
sensor circuit.
(6) The engine control module is
troubled.
55IAC valveIAC valve does not move to (1) The IAC valve position sensor is
position the intended position (opening troubled.l ;papp$Priate idle
sensor angle), even though idle air (2) Open-circuit, short-circuit or
l Engine stops*
control motor operates many improper connector contactl Unstable idling*
times. occurs in the
IAC valve position
sensor circuit.
(3) The idle air control motor (DC
motor) is troubled.
(4) Open-circuit, short-circuit or
improper connector contact
occurs in the idle air control
motor (DC motor) circuit.
(5) The engine control module is
troubled.
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13-126FUEL SYSTEM - Troubleshooting
FAILSAFE/BACK-UP FUNCTIONS LIST
If trouble with any major sensor is detected by the on-board diagnostic,\
the vehicle will be kept in the safe
driving conditions according to the preset control logic.
Trouble item Control content for trouble
Volume air flow(1)Fuel injection timing and ignition timing are determined according to th\
e throttle positionsensorsensor (TPS) and engine revolution speed signal (crankshaft position \
sensor signal).(2)The IAC motor is fixed in the appointed position so idle air control is not per\
formed.
Intake air temperature The control is executed with the suction air temperature regarded as
25°C (77°F).sensor
Throttle position The fuel injection rate is not increased for acceleration according to t\
he throttle position
sensor (TPS)sensor signal.
Engine coolantThe control is executed with the coolant temperature regarded as 80°C (176’F).temperature sensor
Camshaft positionSimultaneous injection of fuel is executed for all cylinders. (In this \
case, the
No.1 cylinder top
jenS0r
dead center is not detected at all after the ignition key is turned
on.)3arometric
pressure The control is executed with the pressure regarded as 760 mmHg
(30 in. Hg.).
sensor
AC valve position Idle air control motor is not performed.;ensor
Ixygen sensor
Closed loop control of the air/fuel mixture ratio is not executed.
READ OUT OF DIAGNOSTIC TROUBLE CODE
Refer to P.13-16.
EbW&R MEMORY OF DIAGNOSTIC TROUBLE
Refer to
P.13-17.
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FUEL SYSTEM VALVE> - Troubleshootins
CHECK CHART CLASSIFIED BY PROBLEM SYMPTOMS
ProblemsymptomsStartingIdling stability Drivingr”
.-
%scn
E5
$4.a,o_
5;i
cz
iP.13-143
-
Ea,Ll2a
F.- s
G-
DE-
c-
Elc
-
-
>El
)El-
)I3-
)@I
I-

-
i
-
5‘32a,$%ba”
D&l DEI
i>El
-0%,a>+y -2.gPE.-50 z.E r2?p9 6=& g-

-
-Sheck items
‘ower
supply
%ginecontrol module power groundI
1 P.13-146
:uel pump
Jolume air flow sensor
B
f
E3
DELI @El
cP.13-162
P.13-165III P.13-167I
1/ P.l3-171 1
P.l3-172
P.l3-173
P.l3-175
P.13-176
P.l3-179
ntake air temperature sensor
BIB
DEI
0
DEl
3El
3
-I
iarometric
pressure sensor
ingine coolant temperature
sensor
‘hrottle position sensor
Iosed throttlepositionswitch
K valve oosition sensor
lamshaft position sensor
i-:rankshaft positionsensorIIlnition
switch-ST I
-I---0lnition switch-ST and park/neutralosition switch
chicle
speed sensor
ower steering pressure switch
ir conditioning switch and/C compressor clutch relayI/I- IIlxygen sensor
@El@ P.l3-181
@ElP.13-184
@[email protected]
Ile air control motor (DC motor)
inition coil and ignition powerOFI@piJOEIansistor
tiaporative emission purge solenoid01 P.13-189
1 Id
kl
c
tr
t
EGR solenoid @El@[email protected]
Fuel pressureOIlI @El8E.l @El @El @[email protected]
0 : Warm engine (number inside indicates check order)
0 : Cold engine (number inside indicates check order)
PROBLEM SYMPTOMS TABLE (FOR YOUR INFOMATION)
Refer to P.13-19.
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13-136FUEL SYSTEM VALVE>- Service Adjustment Procedures
TPS connector
7FUO629
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANINGMl3Rcv
(1)Start the engine and warm it up until the engine coolant is
heated to
80°C (176°F) or higher and then stop the engine.
(2)Remove the air intake hose from the throttle body.
(3)Plug the bypass passage inlet of the throttle body.
Caution
Do not allow cleaning solvent to enter the bypass
passage.
(4)Spray cleaning solvent into the valve through the throttle
body intake port and leave it for about 5 minutes.
(5)Start the engine, race it several times and idle it for about 1 minute. If the idling speed becomes unstable (or if the
engine stalls) due to the bypass passage being plugged,
slightly open the throttle valve to keep the engine
running.
(6)If the throttle valve deposits are not removed, repeat steps
(4) and (5).
(7)Unplug the bypass passage inlet.
(8)Attach the air intake hose.
(9)Use the scan tool to erase the diagnostic trouble code.
(10) Adjust the basic idle speed. (Refer to
P.13-134.)
NOTE
If the engrne hunts when idling after adjustment of the basic
idle speed, remove the
@ cable from the battery for 10
seconds or more, and then run the engine at idle again.
CLOSED THROTTLE POSITION SWITCH AND
THROTTLE POSITION SENSOR ADJUSTMEy,zIFF
(1) Disconnect the connector of the throttle position sensor.
(2) Connect an ohmmeter between terminal
@I (closed throttle
position switch) and
@ (sensor ground) by using jumper
wires.
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FUEL SYSTEM VALVE> -Service Adjustment Procedures13437
I;gFixed SAS
Terminal @Terminal @(sensor output) (sensor ground) /
(3)Insert a feeler gauge with a thickness of 0.65 mm (.0256 in.)
between the fixed SAS and the throttle lever.
(4) Loosen the throttle position sensor mounting bolt; then turn the throttle position sensor body fully counter clock-
wise.
(5) In this condition, check for continuity between terminals
@
and 0.
(6) Slowly turn the throttle position sensor in the clockwise di- rection until the point at which continuity between termi-
nals
@I and @ changes to non-continuity is found.
Tighten the throttle position sensor installation bolt at that position.
(7) Connect the connector of the throttle position sensor.
(8) Connect the scan tool to the data link connector (white).
(9) If not using the scan tool, proceed as follows:
0 Disconnect the throttle position sensor connectors and connect the special tool, Test Harness Set, between
the disconnected connectors.
0 Connect a digtal voltmeter between the throttle posi-
tion sensor terminal
@ (sensor output) and terminal Q
(sensor ground).
(lO)Turn the ignition switch ON (but do not start the engine).
(11)Check the throttle position sensor output voltage.
When using the scan tool, select item
No.14 and read the
throttle position sensor output voltage.
Standard value:
400-1000 mV
(12) If there is a deviation from the standard value, check the throttle position sensor and the related harness.
(13) Remove the feeler gauge.
(14) Switch OFF the ignition switch.
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13-138
FUEL SYSTEM (SOHC-16 VALVE>- Service Adjustment Procedures
FIXED SAS ADJUSTMENT
M13FlDE
NOTE
I,The fixed SAS should not be moved unnecessarily; it has been precisely adjusted by the manufacturer.
2.If the adjustment for any reason is disturbed, readjust as
follows.
(1) Loosen the tension of the accelerator cable sufficiently.
(2) Back out the fixed SAS lock nut.
(3) Turn the fixed SAS anti-clockwise until it is sufficiently
backed out, and fully close the throttle valve.
(4) Tighten the fixed SAS until the point where the throttle lever is touched (i.e., the point at which the throttle valve begins to
open) is found. From that point, tighten the fixed SAS
l-1/4 turn.
(5) While holding the fixed SAS so that it doesn’t move, tighten the lock nut securely.
(6) Adjust the tension of the accelerator cable. (7) Adjust the basic idling speed.
(8) Adjust the closed throttle position switch and throttle posi- tion sensor. (Refer to
P.13-136.)
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FUEL SYSTEM - ?::;:r%t~pection Of MF’13439
ON-VEHICLE INSPECTION OF MFI COMPONENTS
COMPONENT LOCATION
6FUO843
Name Symbol NameSymbol
Air conditioning compressor clutch relay A
Ignition coil (ignition power transistor)
L
Air conditioning switchTIgnition timing adjustment terminalK
Camshaft position sensor and crankshaft posi- InjectorHMtion sensor- Multiport fuel injection relayU
Check engine/malfunction indicator lampS- Oxygen sensorN
Data link connectorQ- Park/Neutral position switch (A/T)6
EGR solenoid I- Power steering pressure switchP
EGR temperature sensor 0
Throttle position sensor (with closed throttle
position switch)
EEngine control modulev
Engine coolant temperature sensorFVehicle speed sensor (reed switch)R
Evaporative emission purge solenoidJVolume air flow sensor (with incorporated,in-
take air temperature sensor and barometncC
Fuel pump check terminalGpressure sensor)
Idle air control motor
D
NOTEThe “Name” column is arranged in alphabetical order. TSB Revision

FUEL SYSTEM - ::ii,,k:t~pection Of MF’13-141
6FuO984
Crankshaft position sensor
\\6FU193~
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/\\\6FUO8Oi
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z Jp$j&& ‘\
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“2$---8%\.35 Fqp2; ,I <,, cLTgg.&~.
,D~~,
1sl ) g , a&&iI& I.“: :
(;-omd!gs?~ 5, gt : .“*I-- L l2,, m ‘IFiTb;qF
/Check engine/malfunction
indicator lamp68b.0093
B :iG i 1
,i mIl-
11
’ 0_;
3
(1P
I”;l-i-yCL, ,\i / ,---_ /
’ - ’ +-+j$p2E~~;:c9h
/ /I----4 ) Jj 1 1’ 6FU0656
68mosJ
I(>/
!,ij”_II. .:a L-2__--. ~-~-Air conditioning I~.~ ~..
LT. --..-6FUO64!
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On-Vehicle Inspection of MFI
13450FUEL SYSTEM VALVE> - Components
VOLUME AIR FLOW SENSOR
Intake air amountWsec)16245
1
@ Componentsideconnectof
Multiport
fuel
injection relay
/ohme air flow sensor/\2/\-
@Harness side
Isv xI 6FU1952
OPERATION TROUBLESHOOTING HINTSRefer to
P.13-49.
INSPECTION
Using Scan Tool
Item No.
12
Data displayInspection conditions Engine condition
Standard value
Sensor de- . Engine coolant Idle speed
18-44 Hz
tection airtemperature: 85-95°C
volume (fre- (185-205°F)
quency)
. Lights, cooling fan, elec-
2,000 rpm64-l 04 Hz tricaI
accessories: OFF
Transaxle: neutral
(PJTmodels: “P” range)RacingFrequency in-
creases as racing rpm increases.
NOTE
The volume air flow sensor output frequency may be about 10% higher than\
indicated above when the vehicle is new[driven approximately 500 km (300 miles) or less].
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1

On-Vehicle Inspection of MFIFUEL SYSTEM VALVE> - Components 13451
Using Oscilloscope
(1) Run the engine at idle speed.
(2) Connect the probe to the osilloscope
pick-up point as
shown in the circuit diagram, and check the wave form.
Regular waveform03AO203
HARNESS INSPECTION
Check for continuity between volume
air flow sensor and
multiport fuel in-
jection relay.
l
Multiport fuel injection relay con-
nector: Disconnected
l Volume air flow sensor connec-
tor: Disconnected
NOTE
Touch the circuit tester probes to
both ends of the harness
a+
OK 121
harness side
connector6FU1953
connector
Check for continuity of the ground-Icircuit.
0 Volume air flow sensor connec-WI+ 131tor: DisconnectedL-l I
OlR0262
/I
module harness
@ Harness sideconnector
= =
6FU1954
0O

K
-I+
Check for broken wire or short-circuit
to ground, between volume air flow
sensor and engine control module.
l Volume air flow sensor connec- tor: Disconnected
l Engine control module connec- tor: Disconnected
El4
Repair the
harness.
(ml-El)
Measure the impressed voltage.
0 Volume air flow sensor connec- tor: Disconnected
l Engine control module connec-
tor: Connected
l Ignition switch: ONconnector
Voltage (V)
4.8 - 5.2
I TSB Revision