MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE AND EMISSION CONTROL Auto-Cruise
Scan tool 86I
C o d e G e n e r a l s c a n
No. control switchP r o b a b l e c a u s e .
[Comment]Speed control switch input above maximum acceptable voltage.lMalfunction of the auto-cruise ,
Replace the auto-cruise control switch.
Scan tool
C o d e G e n e r a l s c a n
No.
34
control switchProbable
.
[Comment]lMalfunction of the auto-cruise control Speed control switch input below minimum acceptable
voltage.
Replace the auto-cruise control switch.
Scan tool15
C o d e G e n e r a l s c a n Speed control servo solenoid
No.system
I, .I
[Comment]l Malfunction of the speed control An open or shorted condition is detected in either the speed control vacuum or vent solenoidl
Malfunction of the connector.
control circuits. l
Malfunction of the
l Malfunction of ‘the PCM.
(Refer to
Measure at PCM connector l Disconnect the connector and
measure at the harness side.
l Voltage between terminal (78) and
groundl Voltage between terminal andgroundOK: positive voltage
and 107
NG
Repair
Check trouble
7 c o n n e c t o r :Check trouble symptom.
Repair
7Replace the PCM.
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1 7 - 1 2E N G I N E A N D E M I S S I O N C O N T R O L Auto-cruise Control
I Scan tool 0 2
control module
[Comment]Internal control module fault is detected. l
Malfunction of the PCM.
the control
[Comment]l Malfunction of the speed control servo.An open or shorted condition is detected in the spe ed control servo power relay control circuit.l Malfunction of the auto-cruise control relay.
l Malfunction of the connector.
l Malfunction of the
l Malfunction of the PCM.
Speed control servo check
(Refer to
Replace
l Voltage between the terminal
l Voltage between terminal andgroundOK: Battery positive voltage
l Disconnect the connector and
measure at the harness side.
l Voltage between terminal (4) and
around Battery positive voltage
Check the following connector:OK Check trouble symptom.
NG
Replace the PCM.
Revision
- - C h e c k
f o l l o w i n g c o n n e c t o r s : and
NG
Check trouble symptom.
necessary.
A u t o - c r u i s e c o n t r o l -OKCheck trouble symptom.
(Refer to 52 and 107
NG N G
auto-cruise control relay and the speed

ENGINE AND EMISSION CONTROL Auto-cruise
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomInspectionR e f e r e n c e
procedure No. page
Communication with scan tool is not possible.11 7 - 1 3
Auto-cruise control doesWhen engine speed rises suddenly217-13not cancel.
When brake pedal is depressed
3 17-14
When selector lever is set to range 417-14
When CANCEL switch is set to ON5.
Auto-cruise control cannot be set. 617-15
Hunting (repeated acceleration and deceleration) occurs at the set vehicle speed.7
When the auto-cruise control main switch is ON, the switch indicator on the6 1 7 - 1 5instrument panel does not illuminate. (However, aut o-cruise control is normal.)
Auto-cruise control main switch illumination light does not illuminate.
917-16
Auto-cruise control indicator light inside combinat ion meter does not illuminate.1 7 - 1 6
[However, auto-cruise control is normal.)
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
INSPECTION PROCEDURE
with scan tool is not possible.
Probable cause
[Comment] l
Malfunction of the A defect in the power supply system (including grou nd) for the diagnostic line mayl Malfunction of harness.
be present.
Refer to GROUP
Troubleshooting.
INSPECTION PROCEDURE 2 When engine speed rises suddenly, auto-cruise contr ol
does not cancel.
[Comment]A malfunction of powertrain control module may exist.
Replace the powertrain control module. l
Malfunction of the
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ENGINE AND EMISSION CONTROL Auto-cruise Control System
INSPECTION PROCEDURE 3
When brake pedal is depressed,, auto-cruise control does not
cancel.
[Comment]A malfunction of the stop light switch or stop ligh t circuit may exist.
Probable cause
l Malfunction of the stop light switch.
l Malfunction of the connector.
l Malfunction of the
l Malfunction of the PCM.
Stop light switch check.
(Refer to
OK
Measure at stop
switch connector
lDisconnect the connector and mea-sure at the harness side.
l Voltage between terminal (1) and
ground positive voltage
following connectors:
NG
63 and
NG
Check troubleNGsymp Check the l i g h t a n d P C M . R e p a i r ,
OK Check trouble symptom.
Replace the PCM.
light switch and the
ground.
,
INSPECTION PROCEDURE 4
When selector lever is set to range, auto-cruise control does
not cancel.
[Comment]An open-circuit in the output signal circuit in IN range may be present.
OK
and.
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Inspect thebetween the NG
transaxle range switch and PCM.
OK
the PCM.
INSPECTION PROCEDURE 5
When auto-cruise control CANCEL switch is set to ON ,
auto-cruise control does not cancel. Probable cause
[Comment]An open-circuit inside the CANCEL switch may be pre
sent.l
Malfunction of the auto-cruise control switch.
Replace the auto-cruise control

ENGINE AND EMISSION CONTROL Auto-cruise System
INSPECTION PROCEDURE 6
Auto-cruise control cannot be set.
[Comment]A malfunction of the auto-cruise control switch circuit may exist.
c a u s e,lMalfunction of the auto-cruise control switch
l M a l f u n c t i o n o f spring.
l Malfunction of the connector.
l
of
Auto-cruise control switch checkN G
Measure at clock spring connector
Disconnect the connector and mea-
* Voltage between terminal (3) and
and 40 Check trouble symptom.
Check the harness between the clockspring and ground. Repair, if necessary.
INSPECTION PROCEDURE 7
Hunting (repeated acceleration and deceleration) oc curs at the
set vehicle speed.
[Comment]
A malfunction of a speed sensor, the speed control servo, or the vacuum supply may be present.
For vehicle speed sensor checkFor input speed sensor or output speed sensor check(Refer to GROUP 54 Combination Meter.)
Speed control servo checkN G
Probable cause
lMalfunction the vehicle speed sensor lMalfunction of the input speed or outputspeed sensor l Malfunction of the l Malfunction of the vacuum supply.
l Malfunction of the PCM.
OK
Vacuum supply check (ReferNG
the PCM.
INSPECTION PROCEDURE 8
When the auto-cruise control main switch is ON, the switch
indicator on the instrument panel does not illumina te.
(However, auto-cruise control is normal.) Probable cause
[Comment]l
Malfunction of the auto-cruise control main
Blown bulb in auto-cruise control main switch.switch.
theau t o - c r u i s e c o n t r o l m a i n s w i t c h .
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17-16ENGINE AND EMISSION CONTROL Auto-cruise Control System
INSPECTION PROCEDURE 9
Auto-cruise control main switch illumination light does not
illuminate. Probable cause
A malfunction of the auto-cruise control main switc
h, or connector may exist.l
Malfunction of the auto-cruise control mainswitch.l Malfunction of the connector.
l Malfunction of the harness.
Auto-cruise control main switch check(Refer to Replace
OK
Measure at auto-cruise control main
switch connector
lDisconnect the connector and mea-sure at the harness side.
l Voltage between terminal (2) and
groundOK: Battery positive voltage
II
OK
Check trouble symptom.
N Gpower supply. Repair, if necessary.
Check the harness between the
auto-cruise control main switch and
rheostat. Repair, if necessary.
INSPECTION PROCEDURE 10
Auto-cruise control indicator inside combination me ter does
not illuminate. (However, auto-cruise control is no rmal.)Probable cause
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l
Malfunction of the bulb.
l Malfunction of the
l Malfunction of the connector.
l Malfunction of the PCM.
(Refer to
illuminate when terminal (22) of PCM connector A-l 06 is

ENGINE AND EMISSION CONTROL Auto-cruise System
TROUBLESHOOTING ENGINE (TURBO) AND ENGINE>
DIAGNOSTIC TROUBLESHOOTING FLOW
Does not
(Refer to (Refer to
No diagnostic troubleDiagnostic troubleNo diagnostic
code or can’t code displayedtrouble code
with scan tool
(Refer to
NOTE
Before carrying out trouble diagnosis, check to be
sure that all of the following items are normal.
1. Is the vacuum hose correctly installed and undam aged?
2. Are the auto-cruise, accelerator, and throttle c ables routed correctly?
3. Do the link assembly and cables move smoothly?
4. Is the play of each cable within its standard va lue?
DIAGNOSTIC FUNCTION
HOW TO READ DIAGNOSTIC TROUBLE CODES
When using the scan tool
1. Connect the scan tool to the data link connector .
Caution
Turn the ignition switch off before or
connecting the scan tool.
2. With the ignition switch in the ON
turn the
auto-cruise control main switch to ON and take a
of the diagnostic trouble codes.
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ENGINE AND EMISSION CONTROL Auto-cruise Control
When using a voltmeter
1.Use the special tool to connect a voltmeter between the
ground terminal and the diagnostic output terminal of
d a t a l i n k c o n n e c t o r .
2.In the same way as when using the scan tool, turn t he
ignition switch to ON and turn on the auto-cruise c ontrol
main switch. Then take a reading of the diagnostic trouble.
codes from the movement of the needle on the voltme ter.
HOW TO READ DIAGNOSTIC TROUBLE CODES FROM A VOLTMET ER
Example of diagnostic trouble code voltage waveformNormalvoltage waveform
For diagnostic trouble code No. 24
NOTE
Other on-board diagnostic items are also output as voltage waveforms corresponding to diagnostic troub le code
numbers.
HOW TO ERASE DIAGNOSTIC TROUBLE CODES
The diagnostic trouble codes can
erased by disconnecting the cable from the battery for 10 seconds
or more and then reconnecting it, or by the followi ng procedure.
1. Turn the ignition switch to ON.
2.With the SET switch at the ON position, turn the ma in switch to ON, and within 1 second after this,
turn the RESUME switch to ON.
3. With the SET switch once more at the ON position , turn the stop light switch ON for a continuous
period of 5 seconds or more.
Auto-cruise control switch
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HOW TO READ INPUT SWITCH CODES
1. Connect the scan tool or a voltmeter to the data link
connector. (Refer to
2.With the ignition switch in the ON position, turn t he S E T
switch to the ON position.
3.Within 1 second after turning the auto-cruise contr ol main
switch to ON, turn the RESUME switch to ON.
4. Operate each switch listed in the input inspecti on table
and take a reading of the input switch codes with t he
scan tool or the fluctuation of a voltmeter.
NOTE
These codes are output as voltage waveforms in the
same way as above.

AND CONTROL
Input Inspection Table
.
Code No.Input operation Operation
21SET switch ONAuto-cruise control-ECU judges that SET switch is O
N
22RESUME switch ON Auto-cruisecontrol-ECU judges that ON
23 Stop light switch
(ON when brake pedal depressed) Auto-cruise control-ECU judges that stop light swit
ch is ON
24
25
26Auto-cruise control-ECU judges that vehicle speed i s 40
km/h (25 mph) or higher ,Vehicle speed signal
Auto-cruise control-ECU judges that speed is lower
than 40 km/h (25 mph)
lClutch pedal position switch Auto-cruise control-ECU judges that clutch (ON when clutch pedal depressed) Park/neutral position switch switch or park/neutral position ONl(ON when selector lever in range)
27 CANCEL switch ON Auto-cruise control-ECU judges that
ON
28 Throttle position sensor signal Auto-cruise control-ECU judges that throttle
voltage is 1.5 or more
29Closed throttle position switch,Auto-cruise control-ECU judges
switch is OFF
INSPECTION CHART FOR DIAGNOSTIC TROUBLE CODES,
Code No.
On-board diagnostic items page
11Auto-cruise vacuum pump drive system
12
14
15
Vehicle speed signal system
Auto-cruise vacuum pump power supply system
Auto-cruise control switch
17-21
.
16
17
Auto-cruise control-ECU
Throttle position sensor system
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E N G I N E A N D E M I S S I O N C O N T R O L Auto-cruise
INSPECTION PROCEDURE: FOR DIAGNOSTIC TROUBLE CODES
Code Auto-cruise vacuum pump drive system
[Comment]
This diagnostic trouble code is output if the release valve, control valve and motor drive signals
from the auto-cruise vacuum pump are not input to t he auto-cruise control-ECU.
(Refer to
l Malfunction of the auto-cruise vacuum pump
l Malfunction of the auto-cruise control-ECU
Measure at
control-ECU
connector
lDisconnect the connector and mea-sure at the harness side.
lVoltage between terminal (12) andground (for driving release valve)lVoltage between terminal (13) andground (for driving control valve)
lVoltage between terminal (26) andground (for driving motor)
OK: Battery positive voltage
Measure at auto-cruise vacuum pump
connector Stop light switch check
I
(Refer to l sure at the harness side.
l Voltage between terminal andgroundOK: Battery positive voltage
OK
auto-cruise control main switch and
auto-cruise vacuum pump. Repair, if
N G
and
OK
Check trouble symptom.
following
OK
Check trouble symptom.
NG
Replace the control-ECU.
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C h e c k t h e b e t w e e n t h eauto-cruisev a c u u m p u m p a n d
auto-cruise control-ECU. Repair, if
necessary.