sensor MITSUBISHI GALANT 1989 Service Workshop Manual
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 1989, Model line: GALANT, Model: MITSUBISHI GALANT 1989Pages: 1273, PDF Size: 37.62 MB
Page 196 of 1273
13-54 FUEL SYSTEM
TROUBLESHOOTING HINTS Hint 1: Hint 2:
If there is a malfunction of the barometric-pressure If, during high-speed driving, there is a noticeable
sensor,
driveability of the vehicle will become worse sharp drop of the displayed pressure of th
e
barometric-rxessure sensor, check for clogging ofparticularly at hig’h altitude
.
the air cleaner.
INSPECTION Using Scan tool
AltitudeStandard valueICheck conditions
Item No. Data display
25Sensor detec-
tion pressure
Function
Data reading
Ignition switch: ON
At 0 m (0 ft.) 760 mmHg
At 600
m(1,969ft.j710 mmHg
I
At 1,200 m660
mmHg(3,937
ft.)
At 1,800
m(5,906 ft.) 610 mmHgI
HARNESS INSPECTION
Check for continuity of the ground
circuit.
. Connector: Disconnected
connector
L,?
la
Fi
gg-CI
e
Repair the
harness.
KBEil-IBHZI)
Measure the power supply voltage of
the barometric oressure
sensor.
. Connector: Disconnected
. Ignition switch: ON
Harness side
connector
Check for an open-circuit or a short-circuit to ground between the engine
control module and the barometric pressure sensor.
f Volume air flow sensor connector: Disconnected
Engine control
module harness
@ Harness sideside connector
Engine control module connec-
tor: Disconnected Repair the
harness.
ozsEl-~)
1 TSB Revision
Page 197 of 1273
FUEL SYSTEM
ENGINE COOLANT TEMPERATURE SENSORMl3wAB
Coolant-
tempera&Coolant temperature
Harness side Component sideEngine coolant temperature sensorIconnector
connectorI -
15EL12011I IA14”24A20
Engine
control
module
If9-3 5v
6FU1239
OPERATION
l The engine coolant temperature sensor func-
tions to convert the barometric pressure to vol-
tage, and to input that voltage (as signals) to the
engine control module.
The engine control module, based upon those
signals, regulates the amount ot fuel injection
and the fast-idling speed when the engine is
cold.
l The 5V power supply within the engine control
module is supplied, by way of the resistance
within the unit, to the engine coolant tempera-
ture sensor; it passes through the engine
coolant temperature sensor, which is a type ofresistor, and is grounded at the engine control
module.
TROUBLESHOOTING HINTS
if, during engine warm-up, the fast-idling speed is
not correct, or black smoke is emitted the problem
is usually a malfunction of the engine coolant tem-
perature sensor. Note that the resistance of the engine coolant
temperature sensor decreases when the tem-
perature of the coolant increases.
l The engine coolant temperature sensor terminal
voltage becomes higher when the resistance of
the engine coolant temperature sensor in-
creases, and becomes lower when the resist-
ance decreases. Consequently, the engine
coolant temperature sensor terminal voltage va- ries in accordance with the temperature of the
coolant, becoming lower when the temperature
of the coolant increases.
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Page 198 of 1273
13-56 FUEL SYSTEM
INSPECTION
Using Scan tool
FunctionItem No.
Data reading
-*LI
Data display
Sensor de-
tection
temperature
HARNESS INSPECTION
connector OlLO461Check conditions
Ignition switch: ON
Or, engine running Coolant temperature
Standard value
At
-20°C (-4°F)-20°C
At 0°C (32°F)0°C I
At
20°C (68°F)20°C
connector - Ic
OIL0463L
-16R1251
Temperature “C (“F)Resistance (kS2)
0 (32)5.9
20 (68)2.5
40 (104)1.1
80 (176) 0.3
(3) If the resistance deviates from the standard value greatly
replace the sensor.
J
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At 40°C (104°F)40°C
At 80°C (176°F)80°C
1
Check for continuity of the ground
circuit.
. Connector: Disconnected
Repair the
harness.
b&XII-@.
lm
Measure the power supply voltage.I. Connector: Disconnected
Ignition switch: ONVoltage
(VI
SENSOR INSPECTION
(1) Remove engine coolant temperature’ sensor from the
intake manifold.
(2) With temperature sensing portion of engine coolan
t
temperature sensor immersed in hot water check resist-
ance.
Page 199 of 1273
FUEL SYSTEM
INSTALLATION
(1) Apply sealant
3M
NUT locking No.41 71 or equivalent to
threaded portion.
(2) Install engine coolant temperature sensor and tighten it to specified torque.
Sensor tightening torque:
20-40 Nm (15-29 ft.lbs.1
(3) Fasten harness connectors securely
THROTTLE POSITION SENSOR
-(‘Throttle position a\“ ’
6FUO637
TerminalvoltageWI
L
Minimum Maximum01 LO838Throttle shaft turning angle162461
Component side
Throttle position sensor
connector
olAO336
Engine control module connector Ml3YJAE
OPERATION
l
The throttle-position sensor functions to convert0When the throttle valve shaft is rotated all the
the degree of opening of the throttle valve to way from the idling position to the fully open
voltage, and to input that voltage (as signals) to position, the resistance between the throttle-
the engine control module. The engine control position sensor’s variable-resistapce
terminal
module, based upon those signals, then regu-
and the ground terminal also increases in
lates the amount of fuel injection, etc. accordance with that rotation, and, as a result,0The 5V power supply within the engine control
the voltage of the throttle-position sensor’s
module is supplied to the throttle-position sen-
variable-resistance terminal also becomes high-
SOT after which it passes through the
resistanceer in
accordance with that rotation.
w&in the sensor and is grounded at the engine
COMO\
module.
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Page 200 of 1273
13-58 FUEL SYSTEM
TROUBLESHOOTING HINTS
Hint 1:Hint 2:
The signals of the throttle-position sensor are more If the voltage of the throttle-position sensor deviates
important for control of the automatic transaxle than from the standard value, check once again after
for control of the engine; shifting “impact shocks” making the throttle-position sensor adjustment.
are produced if there is a malfunction of the
throttle-position sensor.
INSPECTION
Using Scan tool
Function/ Item No.1 Data display 1 Inspection conditions1 Throttle valve1 Standard value
Data reading 14 Sensor
vol-tageIgnition switch: ON held
for 15 sec. or more
HARNESS INSPECTION
E q-0
JJ ~
@ Harness side0
connector
@ Harness sideconnector
Harness side
connector
Measure the power supply voltage of
the throttle position sensor.
. Connector:’ Disconnected
. Ignition switch: ON
Check for continuity of the ground
circuit.
Connector: Disconnected
Repair the
harness.
bZilZl-m* &I)
Check for an open-circuit, or a short-
circuit to ground, between the engine
control module and the throttle posi-
. Throttle position sensor connector: Engine control module connector:
Disconnected Repair the
harness.
Fi&TUI-mj
01103611
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Page 201 of 1273
FUEL SYSTEM
Re
Blu
THROlTLE POSITION SENSOR
SENSOR INSPECTION
(1) Disconnect the throttle position sensor connector, and
connect the special tool (Test harness) between the
disconnected connectors.
(2) Measure the resistance between terminal @ (black clip of
special tool) and terminal @
(red clip) of the connector on
throttle position sensor side.
Standard value: 3.5-6.5
kS2
(3) Measure the resistance between terminal @ (black clip of
special tool) and terminal @
(blue clip).
Open the throttle valve slowly Resistance should vary from
from idle position to fully open approx. 0.5 kQ to 3.5-6.5
kQ
position
smoothly in proportion to
change in throttle valve opening
(4) If the resistance does not conform with specification, or does not vary smoothly, replace the throttle position
sensor.
Throttle position sensor installation torque: 1.5-2.5 Nm (1.1-1.8
ft.lbs.1
Component srde@ connectorThrottle posltlon SensorI
Harness side@ connector
m 1,. I,, .I,, I,, It,
~$-T~ ;I
TerminalvoltageIV1
Engine control module connector
Minimum
Maximum01 LO.0838Throttle shaft turning angle102461
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Page 202 of 1273
13-60 FUEL SYSTEM
OPERATION
TROUBLESHOOTING HINTS
INSPECTION-Using Scan tool
Refer to P.13-57.
HARNESS INSPECTION
Measure the power supply voltage of
the throttle positlon
sensor.
. Connector: Disconnected
. Ignition switch: ON
6FU1241
. Connector: Disconnected
6FU1242
Er’ ”I
miglne controlodule harnessCheck for an open-circuit, or a short-
side connectorcircuit to ground between the engineIcontrol module and the throttle posi-
tion sensor.
19
!!F!=6FU1243
. Throttle position sensor connector: Disconnected0
OK
. Engine control module connector:
Disconnectedr
ASTOP
L
I\:
Throttle posltlon/
sensor connector6FU1244
Repair the
harness.
i
K292Ha)
SENSOR INSPECTION
(1) Disconnect the throttle position sensor connector.
(2) Measure resistance between terminal @ (sensor ground)
and terminal
@ (sensor power).
Standard value: 3.5-6.5
kQ
(3) Connect a pointer type ohmmeter between terminal @
(sensor ground terminal) and terminal
@ (sensor output
terminal).
(4) Operate the throttle valve slowly from the idle position to the full open position and check that the resistanc
e
changes smoothly in proportion with the throttle valve
opening angle.
(5) If the resistance is out of specification, or fails to change smoothly, replace the throttle position sensor.
Throttle position sensor installation torque: 1.5-2.5 Nm (1.1-1.8
ft.lbs.)
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Page 204 of 1273
13-62 FUEL SYSTEM
INSPECTION
Using Scan tool
FunctionItem No.
Data reading 26 Data display
Inspection conditions Switch
status Ignition
switch: ON
(Check after pumping
accelerator several times.) Throttle valve
Normal indication
To idle position
ON
Slightly openedOFF
HARNESS INSPECTION
Harness sideconnector
Y
OlR085
motor connector1 FUO480
Measure the power supply voltage of
the closed throttle position switch.
. Connector: Disconnected
. Ignition switch: ON
IVoltage (V)I
I4 or moreI
Repair theharness.
c@a-m)
SENSOR INSPECTION
(1) Disconnect the idle speed control motor connector.
(2) Check the continuity between terminal
@ and body ground.
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IAccelerator DedalIContinuitvI
DepressedNon-conductive (42)
Released Conductive (0. Q)
(3) If out of specification, replace the idle speed control motor
assembly.
Page 205 of 1273
FUEL SYSTEM
CLOSED THROTTLE POSITION SWITCH
models>
Engine control module M13YKAfIdle speed control
motor (Closed throttle
position switch and
idle speed control
motor
cosition sensor)
Idle speed control/ plunger position
Throttle shaft -x-ring angle -
01209
2
Idle speed control motor
position sensor connector
/ c-~ IONrZ
i i ???FT%
;e
’T
A’,-
a
Closed throttleposition switch
/cmgso,l ,“,“,‘;a;;o;ide
6FU1245
OPERATION
TROUBLESHOOTING HINTS
INSPECTION-Using Scan tool
Refer to
P.13-61.
HARNESS INSPECTION
0I
I
@ Harness sideconnector
\
LI
6FU1246
6Fu12a
(2) Check the continuity between terminal @ and body
ground.
Accelerator pedal Continuity
Depressed Non-conductive
(ma)
IReleasedIConductive (0.
Q)1
(3) If out of specification,rep\ace the idle speed corm\ motor
7/assembly.
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Measure the power supply voltage of
the closed throttle position switch.
. Connector: Disconnected
. Ignition switch: ON
SENSOR INSPECTION/
(1) Disconnect the idle speed control motor position sensor connector.
I
II
Page 206 of 1273
IS-64 FUEL SYSTEM
IDLE SPEED CONTROL MOTOR POSITION SENSOR
@ Component sideIdle speed control motor
connectorposition sensor
l-F---
-
@ Harness side I--
connector
i5EL1402,
4,0
t t
13 A23A17 A14 A24
Enginecontrol
module
: 5v 5v
lFUO514
Fnnirw rnntrol
module connector
Plunger stroke
OlROlOlOlL0838
OPERATION
l The idle speed control motor position sensor functions to convert the data concerning theposition of the plunger (located within the idle-
speed control motor) to voltage, and to input
that voltage (as signals) to the engine control
module. The engine control module, based upon
those signals, then functions to regulate the idle-speed control motor.
l The
5V power supply within the engine control
module is supplied to the idle speed control
position sensor; it then passes through the re-
sistance within the sensor and is grounded at
the engine control module.
TROUBLESHOOTING HINTS
Hint 1’
The idle speed control motor position sensor is the
most important sensor for control of the idling
speed; there is very often a malfunction of this sen-
sor if a problem occurs when the ,engine load is
caused to fluctuate, such as when, during idling, the
air conditioning switch is switched back and forth
between OFF and ON, etc. l
When the plunger located within the idle-speed
control motor extends from its contracted con-
dition, the resistance between the idle speed
control motor position sensor’s variable-resist-
ance terminal and the ground terminal also in-
creases in accordance with that extension. As a
result, the voltage of the idle speed control
motor position sensor’s variable-resistance ter-
minal also becomes higher in accordance with
the extension.
Hint 2:
If the output voltage of the idle speed control motor
position sensor deviates from the standard value
even though the results of the checking of the idle
speed control motor position sensor harness and of
the component itself are normal, the malfunction
may be presumed to be among the following:
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