display MITSUBISHI GALANT 1989 Service Service Manual

FUEL SYSTEM -On-Vehicle Inspection
of MFI
Components13-305
IGNITION COIL AND IGNITION POWER TRANSISTOR
Ml3WAAb
@ Harness sideconnector
@ Harness sideconnector
5EL13031
@ Component sideconnector
15EL1700
Battery
@CompmntStde con-
control
module
a
Spark
PlUGI .-
'. 1
Enoine
Engine control module connector
OPERATION
INSPECTION
Using Scan tool
Refer to P.13-302.
cm
i
Function Item No.
Data displayInspection conditionsEngine condition Standard valueI
reading445- 15” BTDC
BTDC ) BTDC
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AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
Auto-cruise control system cannot be set.
NOTE
If. after the occurrence of the problem, the ignition switch and
the main switch have not been switched OFF, it is possible to
Prepare to conduct input check.determine (by checking the on-board diagnostic output code)
which circuit canceled the system’s operation.
This chart is to be used, then, for troubleshooting if it is not possible
to use the on-board diagnostic for checking.
Were codes No. 21, 22 and 25 displayed when,with the vehicle stationary, the input check
codes were recalled?
Yes
No0 Damaged or disconnected wiring of the ECU power-supply cir--cuit (Go to check chart 1 on page 13-339.)l Damaged or disconnected wiring of the SET or RESUME switch(Go to check chart 2 and 3 on page 13-338.339.)
le results of all input checks normals?
YesNo
.t
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.
Check resultsProbable causeRemedyCheck chart
No.
Code 21 remains even though
SET switch is set to OFF. SET switch ON mal-Replace the control
No. 2
function switch.
SET switch input lineRepair the harness.
short-circuit
Code 22 remains even though RESUME switch is set to OFF.RESUME switch ON Replace the controlNo. 3
malfunction
switch.
RESUME switch inputRepair the harness.
line short-circuit
Code 23 remains even though
CANCEL switch is set to OFF. Malfunction of the
CANCEL circuit
(ON malfunction) Check or repair each
No. 6-1, 6-2,
CANCEL circuit.6-3
Code 25 does not disappear, and
Malfunction of the ve- Check or repair the No. 4
code 24 does not appear, even hicle-speed
sensor cir- vehicle speed sensor
though vehicle speed reaches ap-
cuit (damaged or dis-circuit.
proximately 40 km/h (25 mph) or connected wiring, or
higher.short-circuit)
ie actuator circuit.1NOTECheck tl(GO to check chart No.5 on page 13-343.)If the results of the check of the actuator circuit (check Chart
No.5) and of the actuator itself (P.13-396) reveal no abnormal
condition, replace the electronic control unit (ECU).

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
NOTE
13-351
Auto-cruise control system cannot be set.
This chart is to be used, then, for troubleshooting if it is not
possible to use the on-board diagnostic for checking.
Prepare to conduct input check.
Where codesNo.21,22, 23, 25 and 26,displayed when,with the vehicle stationary,
the input check codes were recalled?Damaged or disconnected wiring of the ECU power-supply cir-
l Damaged or disconnected wiring of the SET or RESUMEswitch (Go to check chart 2 and 3.)l Damaged or disconnected wiring of the stop light switch,clutch pedal position switch or park/neutral position switch (Go
1 Are the results of all input checks normals?
YesNo
ck the auto-cruise vacuum pump circuit.1 (Go to check chart No.5.)
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Check results
’Probable cause RemedyCheck chartNo.
Code 21 remains even though SETswitch is set to OFF. SET switch ON mal-function
SET switch input line
short-circuitF,I~JI;? the control
Repair the harness.
No. 2
Code 22 remains even though RE-SUME switch is set to OFF. RESUME switch ON
Replace the controlNo.3malfunctionswitch.
RESUME switch inputRepair the harness.line short-circuit
Code 23 is not canceled even if theMalfunction of stopReplace stop lightNo.6
stop light switch is turned OFF by light switch circuit.switch or repair har-
releasing the brake pedal.
ness.
Code 25 does not disappear, and
Malfunction of theCheck or repair theNo.4
code 24 does not appear, evenvehicle-speed sensor vehicle speed sensorthough vehicle speed reaches appro-circuit (damaged or dis-circuit.ximately 40 km/h (25 mph) or higher.connected wiring, orshort-circuit)
Code 26 is not canceled even if the Malfunction of clutch
Replace clutch pedalNo.8clutch pedal position switch is turnedpedal position switchposition switch or repairOFF by releasing the clutch pedal.
circuit.harness.
Code 26 is not canceled even if the
Malfunction of park/Replace park/neutralNo. 7
select lever is moved to anything but neutral position ,switchposition switch or repair
v. P .circuit.harness.
NOTE
If the results of the check of the auto-cruise vacuum pump
circuit (check chart No. 5) and of the auto-cruise vacuum pump
and actuator itself
(P.13-401.) reveal no abnormal condition, re-
place the electronic control unit (ECU).

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting13-361
Wi
thscan tool
With voltmeter
Auto-cruise control
\
Data link
connector
III
n
,
/r-I
/Ground161009
Data link
connector
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On-board diagnostic checking is performed when there has
been an automatic cancellation, without cancel switch opera-
tion.
(1) The following two methods can be used for checking the diagnostic. Note that the data link connector is locatedunder the driver’s side instrument panel.
@ If a scan tool is used
Connect the scan tool’s socket and connector to the
cigarette lighter socket and the data link connector, and
set the tester. Use the tester according to its operation
instructions; display the diagnostic trouble code num-
ber and then check.
@ If a voltmeter is used Connect a voltmeter between the ground terminal and
the terminal for auto-cruise control of the data link con-
nector.
It is possible to discover which circuit is the cause of
the cancellation by verifying the indication shown by
the voltmeter with the display patterns shown on the
next page.
(2) When the diagnostic trouble code No. is displayed, check by referring to the check chart applicable to that number.
NOTE
Canceling the diagnostic trouble codes
The diagnostic trouble codes remain in memory until the battery is turned off but they can be canceled in the follo-
wing ways without disconnecting the battery terminals.
@ By turning on the ignition switch.
@ By turning the main switch ON while the SET switch is ON and then, within 1 second, turning the RESUME
switch ON. (Put into condition for input check recep-
tion).
@ By turning ON the SET switch and stop light switch at the same time and continuing the ON condition for 5
seconds or more.
@I By checking that the diagnostic trouble codes are canceled using a scan tool or voltmeter.

13-362AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
DIAGNOSTIC DISPLAY PATTERNS AND TROUBLE CODES Code Display patterns (output codes)
No.(use with voltmeter)
11
xJa-.tu
Probable causeCheck chart No.
Abnormal condition of actuator drive systemNo.5
Abnormal condition of auto-cruise vacuum
pump drive system
1212vAbnormal condition of vehicle-speed signal No. 4systemov/
13"12vLow-speed limiter activation (The system is -normal if it can be reset.)
ov
14*12v14Automatic cancellation activated by vehicle -speed reduction. (The system is normal if it
ov can be reset.)
15"12v15Control switch malfunction (when SET and No.2, 3
RESUME switches switched ON simul-
ovtaneously)
16"Cancel switch ON signal input (including inputNo. 6-1, 6-2. 6-3
12v16wirings damage or disconnection, or problemin circuitry within the control unit) ov
we>
Abnormal condition of auto-cruise control unit-
17"12v17Throttle position sensor malfunctionNo. 11
Closed throttle position switch malfunction
ov
NOTE
1. Codes indicated by the * symbol are displayed, if the conditions are satisfied, even if the system is
normal. In either case, the system is normal if it can be reset. If ther\
e is an automatic cancellation not
intentionally made by the driver, however, excluding cancellations explicitly made by the
cancel
procedure, there may be a temporary malfunction such as poor contact of \
a harness connector even
though the system can be reset, and for that reason it is necessary to c\
heck according to each individual check chart that is applicable.
ON
OFF
-
Display when vehicle speed is less thanapproximately 20 km/h (12 mph), or before
the auto-cruise control system is set
0.5 set
++P5 setDiagnostic trouble codes are displayed when, after cancel-
lation of the auto-cruise control system, the vehicle speed
decreases to less than approximately 20 km/h (12 mph),
and are canceled by turning OFF the battery or canceling
the diagnostic trouble codes. (Refer to
P.13-361.) cuume type> 03ROlS6
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2.Diagnostic trouble codes are displayed when, after cancel-
lation of the auto-cruise control system, the vehicle speed
decreases to less than approximately 20 km/h (12 mph),
and are erased by switching OFF the ignition switch or the
main switch.

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting13-363
With scan toolri++, lighter ;
03A0258
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After the diagnostic trouble codes in the memory are
erased, if (when the power supply of the electronic controlunit is switched ON once again) the power supply of the
electronic control unit is normal, the on-board diagnostic
output code display will be as below, regardless of
whether the system condition is normal or not.
@ If a scan tool is used: “NORMAL!!” will be displayed.
@ If a voltmeter is used:Continuous ON/OFF signals will be displayed at 0.5
second intervals.
(Refer to the figure at the left.)
INPUT CHECKING
Input checks should be made when the auto-cruise control
system cannot be set and when it is necessary to check
(when a malfunction related to the auto-cruise
contra! system
occurs) whether or not the input signals are normal.
NOTE
1. If inspection of on-board diagnostic is necessary, confirm diagnostic trouble code first and conduct input check.
2.Input check can be conducted by set operations. On-board
diagnostic terminal outputs display patterns.
3.Display codes are displayed only if the circuit is normal ac-
cording to the conditions shown in the table on the next
paw
WITH SCAN TOOL
(1) The setting of the scan tool is the same as for the on-board diagnostic check.
(2) Turn the ignition switch to ON and switch OFF the main switch.
(3) Select the cruise control system from the scan tool’s menu.
(4) With the set switch ON, switch ON the main switch, and
then, within one second, switch ON the resume switch.
(5) Select the diagnostic trouble code from the scan tool’s
menu.
(6) Perform each input operation according to the input check table (on the next page) and read the codes.
(7) Switch the main switch OFF.
WITH VOLTMETER
(1) The voltmeter is set in the same way as for the on-board diagnostic check.
(2) Turn the ignition switch to ON and switch OFF the main switch.
(3) With the set switch ON, switch ON the main switch, and then, within one second, switch ON the resume switch.
(4) Perform each input operation according to the input check
table (on the next page) and read the codes.
(5) Switch the main switch OFF.

13-364AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
INPUT CHECK TABLE
Code Display patterns (output codes) Input operationCheck resultsNo.(use with voltmeter)
21SET switch ONSmE,: switch circuit nor-
RESUME switch ON RESUME switch circuit
normal
23

Each cancel switch ONEach cancel circuit nor-
1. Stop light switch (brake pedalmal
depressed)
2. Clutch pedal position switch(clutch pedal depressed)
St;p light switch nor-
>
3. Park/neutral position switch
(shift lever to “N” range)
>

Stop light switch ON (brake pedal
depressed)
24
25
n r
Driving at approximately to 40 When both No.4 and
km/h (25 mph) or higherNo.5 can be confirmed,
vehicle-speed sensor
circuit normal.
n r
Driving at less than approximately
to 40 km/h (25 mph) or stopped
26I. Clutch pedal position switchsNJFy;h pedal depressed)
2. Park/Neutral position switch
ON (shift lever to “N” or “P”
range)
Clutch pedal positionswitch, park/neutral position switch normal
28Throttle position sensor output
voltage over 1.5V (when the ac-celerator pedal is pressed more
than half way)
$yro;e position sensor
Closed throttle position switch Closed throttle position
OFF (accelerator pedal depressed)switch normal
NOTE1. Each code will be displayed in an order of priority beginning from No\
. 1.If there is no display, it is possible that there is a malfunction of th\
e ECU power-supply circuit or the SET and/orRESUME switch, so check according to check charts 1.2 and 3 (P.13-339,340,341,354,355).2. Continue each input operation until the output code is emitted.If no output codes are emitted for inputs even though the display patter\
n is repeated two or more times, there is amalfunction of the switch sensor.3.When each input operation is performed and the signals for the condition\
s are received by the computer, eachoutput 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 ONto OFF), the code will be displayed for one cycle of the display, but w\
ill not be displayed during the next cycle.This makes it possible, therefore, to check the OFF condition (existenc\
e of not of a short-circuit of the input line orthe switch).
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33B-16 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
NOT’=
(1)
(2)
13)
(4)
(5)
‘T‘he alarm light does not illuminate for an abnormal condition (code No.12) of the generator output voltage (#,.terminal) or for air leakage (code No.56) within the front or rear valves.
For malfunctions represented by a code number with the* symbol, if the malfunction is of a temporary nature (such
as improper contact of a connector, etc.), the warning lamp’s illumi\
nation will stop when the malfunction stops, and
the function will return to normal.
When the alarm light is illuminated (i.e. when a malfunction has been d\
etected), the control mode cannot be switched (with the exception of a certain few malfunctions) when the c\
ontrol switch is pressed,.
If two or more malfunctions occur at the same time, the corresponding co\
de numbers will be displayed
In order from
the lowest one.
Cancellation of malfunction codes after checking and repair (from 1990 \
models)
Method 1: Connect a scan tool and cancel as described below.
1
w
Select “4 SPECIAL TEST” of the scan tool’s function-select menu\
.2 Next, select item No.5
“ERASE DIAG.“.
3 Press the YES key when “ERASE DIAG. DODE?” is displayed.
4
lnout ID NBR. “37”
.
8
5 Press the CLEAR key when “FINISHED ERASING DIAG. CODE” is displayed.6Disconnect the scan tool.
Method 2: Disconnect the ground cable from the battery’s negative terminal for \
10 seconds or longer, and then
reconnect.
If this method is used, note that data entered to the memory of the radi\
o and the clock will be erased,
so readjustment is necessary after the work is completed.
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1

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-23
Operation
The G-sensor detects the amount of acceleration
that is generated (to the left or right) when the
vehi-
response to acceleration, and these changes are
cle body turns. Applying the principle of the dif-
taken out as changes of voltage. Within the coil,
ferential transformer, the magnetic field changes silicon oil is enclosed in order to suppress the vibra-
tion of the movable iron core. Note that the
G-sen-
when the movable iron core within the coil moves in
Diagnostic sor is a special sensor for control of rolling.
When signals that are otherwise virtually
in-
conceivable are input due to damaged or discon-
a heavy-line circuit, the alarm light illuminates and
control is as described in the table below.
netted wiring or a short-circuit or similar problem of
Diagnostic No.Attitude controlDamplng force
controlVehicle-heightcontrol Switch acceptanceHIGH
SPORT AUTO SOFT
I11Rolling control
only stops Normal operation
Normal operation Accept
Service data indication
Code NoIndication
Standard value Display
11G-sensor output voltage 2.5V
when vehicle is horizontal 11: G SNSR:
2.5V
ECU terminal voltages (when connector is connected)
Terminal
NoCondition
Terminal
voltageIII
34 Power supply for sensor When the ECU is activated7.3vI
28G-sensor output signal
35 Sensor circuit earth When stoppedi
When wiring is damaged or disconnected
Constantly 2.5V
ov
ov
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-.
Checking the G-sensor circuit (with the connector disconnected)
Terminal ConnectIon
destination or MeasurementNomeasured part Tester connection
Check conditionStandard
28 G-sensor output
Resistance
28-2ConstantlyContinuity
34G-sensor power source
Resistance34-1ConstantlyContinuity
Troubleshooting hints
Malfunction
mode Malfunction probable causeMatfunctIonNoteSilicon
oil leakage
Because the sillcon
oil for
suppresslon of
l Rolling control occurs frequently-
vlbratlons of the G-sensor movable iron core is leaktng due to a collision.
the sensitivity is
oversensitive.
Damaged or
disconnected
earth line The ground line is damaged or disconnected.
l-Malfunction is not detected because the There are times of a feeling of
ground line is grounded to the G sensor’s body incompatibility of the rolling control
l
itself, however, noise is easily picked up. Rolling
control occurs suddenly; an error
occurs

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-25
OperationThe generator
‘I-” terminal signal is used to deter-
pressor
operation, and is because activation of the
mine whether or not the engine is operating.
This is in order to reduce the frequency of
com-
system is possible while the engine is operating, or
at a vehicle speed of 3 km/h (2 mph) or higher.
Diagnostic
When the generator “L” terminal is LOW level (as a result of a short-circuit of the heavy-line circuit or
due to an abnormal condition of the generator) even
though the vehicle speed is 40 km/h (25 mph),
con-
trol is as described in the table below.Note,
however, that there is no detection if there is
damaged or disconnected wiring of the harness,
and the alarm light does not illuminate.
Diagnostic No. Attitude control Damping force
control Vehrcle-height
control
HIGH
Switch acceptance
SPORTAUTOSOFT
I12‘“L” terminal “L” logic
““L” terminal “L” logic: As a result of system operation conditions, the system is not ac\
tivated at a vehicle speed of less than 3 km/h (2mph). When the vehicle speed becomes 3 km/h (2 mph) or higher all fun\
ctions are normal. (Refer to the explanation of the opera-
tron.)
Service data indication
1 CodeNo. /Indication Display
I12The output voltage level of the12: ALT. LTERMI.
HIGH/LOW
generator “L” terminal is indicated.
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ECU terminal voltage (when connector is connected)
Terminal
No.Signal Condition Termrnal
voltage
52Generator ‘I” terminal signal When engine stalls
When engine is operating
When harness wiring is damaged or disconnected0.5-3v
13-15v
5v
Checking the generator “L” terminal circuit (with the connector d\
isconnected)
Terminal Connection destination or
M
easurement
No.measured part Tester connectronCheck condrtion
Standard
52 Generator
Voltage52 ground Ignition switch ON
2-5V
While engine is operatingB+
B+: Battery positive voltage