1998 MITSUBISHI MONTERO ECU

13. If input switch Code 26 is still displayed, go to TEST NO. 14. If
codes are no longer displayed, replace cruise control ECU.
Test No. 9
A malfunction of Vehicle Speed Sensor (VSS) or incorrect
vacuum in cruise control vacuum pump or actuator may be present.
Probable causes are:
* Malfunction of VSS.
* Malfunction of cruise control vacuum pump.
* Malfunction of actuator.
* Malfunction of cruise control ECU.
1) Check vehicle speed sensor. See VEHICLE SPEED SENSOR TEST
under COMPONENT TESTS. If speed sensor is okay, go to next step. If
speed sensor is defective, replace VSS.
2) Check cruise control vacuum pump. See VACUUM PUMP TEST
under COMPONENT TESTS. If pump is defective, replace pump. If pump is
okay, go to next step.
3) Check actuator. See ACTUATOR TEST under COMPONENT TESTS.
If actuator is defective, replace actuator. If actuator is okay,
replace cruise control ECU.
Test No. 10
A blown bulb in cruise control main switch or malfunction of
cruise control main switch is probable cause of malfunction. Replace
cruise control main switch.
Test No. 11
A malfunction of cruise control main switch, harness or
connector may exist. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of connector.
* Malfunction of harness.
1) Check cruise control main switch. See
CRUISE CONTROL SWITCH TESTS under COMPONENT TESTS. If switch is okay,
go to next step. If switch is defective, replace cruise control main
switch.
2) Disconnect cruise control main switch connector C-01. At
harness side of connector, measure voltage between terminal No. 2 and
ground. If battery voltage is present, go to next step. If battery
voltage is not present, check joint connector C-130 and junction block
connector C-80. Repair as necessary. See Figs. 16, 18, 26 and 28. If
connectors are okay and malfunction remains, check harness between
cruise control main switch and power supply. Repair as necessary.
3) Check cruise control main switch connector C-01,
combination meter connector C-04, and joint connector C-130. Repair as
necessary. See Figs. 8, 9, 16 and 28. If connectors are okay and
malfunction remains, check harness between cruise control main switch
and dash lights rheostat. Repair as necessary.
Test No. 12
A malfunction of bulb, connector or harness may exist.
Probable causes are:
* Malfunction of bulb.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Perform cruise control indicator test. See

CRUISE CONTROL INDICATOR TEST under COMPONENT TESTS. If cruise control
indicator is defective, replace indicator. If indicator checks okay,
go to next step.
2) If cruise control indicator illuminates when cruise
control connector C-50 terminal No. 23 is grounded at harness side,
replace cruise control ECU. If indicator does not illuminate, check
combination meter connector C-12 and cruise control ECU connector C-
50. Repair as necessary. If connectors are okay and malfunction
remains, check harness between combination meter and cruise control
ECU. Repair as necessary.
Test No. 13
1) Perform stoplight switch test. See
BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. If switch is
okay, go to next step. If switch is defective, replace brakelight
switch.
2) Check cruise control ECU connector C-50, stoplight switch
connector C-55 and joint connector C-131. Repair as necessary. See
Figs. 13 , 14, 16 and 29. If connectors are okay and malfunction
remains, check harness between joint connector C-131 and cruise
control ECU.
Test No. 14 (A/T)
1) Perform park/neutral switch test. See
PARK/NEUTRAL SWITCH TEST under COMPONENT TESTS. If switch is okay, go
to next step. If switch is defective, replace switch.
2) Check starter relay. Replace if defective. If relay is
okay, check cruise control ECU connector C-50 and joint connector C-
130. Repair as necessary. See Figs. 13, 16 and 28. If connectors are
okay and malfunction remains, check harness between cruise control ECU
and power supply.
COMPONENT TESTS
ACTUATOR TEST
Remove actuator. Apply vacuum to actuator. Actuator linkage
holder should move more than 1.38" (35 mm). Actuator diaphragm should
hold vacuum. Replace actuator if actuator does not test as specified.
BRAKELIGHT/STOPLIGHT SWITCH TEST
Disconnect stoplight switch connector C-55. When brake pedal
is pressed, continuity should be present between terminals No. 2 and
3. See Fig. 14. When brake pedal is released, continuity should be
present between terminals No. 1 and 4. Replace switch if it does not
test as specified.
CLOCKSPRING TEST
WARNING: Deactivate air bag system before performing any service
operation. See AIR BAG RESTRAINT SYSTEMS article. Do not
apply electrical power to any component on steering column
without first deactivating air bag system. Air bag may
deploy.
If clockspring fails any check, replace with a NEW
clockspring.
1) Check connectors and protective tube for damage and
deformities.
2) Visually check case for damage or deformities.

* PLEASE READ THIS FIRST *
NOTE: Self-diagnostics should be performed when cruise control
cancels without driver using normal cancel modes.
RETRIEVING CODES
1) Data Link Connector (DLC) is located to left of steering
column. Use analog voltmeter or scan tool for code retrieval. Follow
scan tool manufacturer's instructions.
2) Using an analog voltmeter, connect leads between cruise
control terminal and ground terminal of DLC. See Fig. 35. Count number
of deflections and pauses of voltmeter needle to determine trouble
code. Digit count is about 0.5 second per pulse and pause between
digits is about 2 seconds. Once trouble codes have been displayed, see
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION TABLE









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Code Diagnostic Item
11 .............................. Vacuum Pump Drive System
12 ........................... Vehicle Speed Sensor Signal
14 ....................... Vacuum Pump Power Supply System
15 ................................. Cruise Control Switch
16 .................................... Cruise Control ECU
17 ....................... Throttle Position Sensor System









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Fig. 35: Identifying Data Link Connector Terminals
Courtesy of Mitsubishi Motor Sales of America
CLEARING CODES

1) To clear trouble codes, disconnect battery cable, or use
alternative method to prevent memory loss.
2) Turn ignition on. Turn main cruise control switch and SET
switch to ON position, and within one second, turn RES switch to ON
position. Hold stoplight switch and cruise control switch in ON
position for greater than 5 seconds. Verify codes are cleared.
DIAGNOSTIC TESTS
CODE 11: VACUUM PUMP DRIVE SYSTEM
Code 11 is displayed if release valve, control valve and
motor drive signals from vacuum pump are not input to cruise control
ECU. Probable causes are:
* Malfunction of vacuum pump.
* Malfunction of stoplight switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Check vacuum pump. See VACUUM PUMP TEST under COMPONENT
TESTS. If vacuum pump is defective, replace vacuum pump. If vacuum
pump is okay, go to next step.
2) Disconnect cruise control actuator harness connector A-57
or A-95. See Fig. 5. At harness side of connector, check voltage
between terminal No. 1 and ground. If battery voltage is present, go
to next step. If battery voltage is not present, check stoplight
switch. See BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS.
Replace switch if defective. Check cruise control main switch harness
connector C-01 and stoplight switch harness connector C-55. Repair as
necessary. If malfunction remains, check harness between cruise
control main switch and vacuum pump. Repair as necessary.
3) Disconnect cruise control ECU connector C-50. See Fig. 13.
At harness side of connector, check voltage between ground and
terminals No. 12 (driving release valve), No. 13 (driving control
valve), and No. 26 (driving motor). If battery voltage is present, go\
to next step. If battery voltage is not present, check and repair
connectors A-57 or A-95 and C-111 as necessary. See Figs. 5 and 24. If
malfunction remains, check and repair harness between vacuum pump and
cruise control ECU as necessary.
4) Check cruise control ECU connector C-50. Repair as
necessary. If malfunction remains, replace cruise control ECU.
CODE 12: VEHICLE SPEED SENSOR SIGNAL
Code 12 is displayed if vehicle speed signals from vehicle
speed sensor are not input to cruise control ECU when vehicle speed is
25 MPH or more. Probable causes are:
* Malfunction of VSS.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Check vehicle speed sensor. See VEHICLE SPEED SENSOR TEST
under COMPONENT TESTS. If speed sensor is okay, go to next step. If
speed sensor is defective, repair or replace as necessary.
2) Disconnect combination meter connector C-06. See Fig. 10.
At harness side of connector, with ignition switch in ON position,
measure voltage between terminal No. 1 and ground. If voltage is 4.5
volts or more, go to next step. If voltage is less than 4.5 volts,

check cruise control ECU connector C-50 and joint connector C-130.
Repair as necessary. See Figs. 13, 16 and 28. If malfunction remains,
check harness between combination meter (instrument cluster) and
cruise control ECU. Repair as necessary.
3) Disconnect combination meter connector C-04. See Fig. 9.
Check for continuity at harness side between terminal No. 43 and
ground. If continuity is present, go to next step. If continuity is
not present, check harness between combination meter and ground.
Repair as necessary.
4) Inspect combination meter connector C-04. If connector is
defective, repair as necessary. If connector is okay and malfunction
remains, replace cruise control ECU.
CODE 14: VACUUM PUMP POWER SUPPLY
Code 14 is displayed when drive signals for vacuum pump
release valve, control valve and motor are not input into cruise
control ECU. Probable causes are:
* Malfunction of stoplight switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Disconnect vacuum pump connector A-105. See Fig. 6. At
harness side of connector, check voltage between terminal No. 1 and
ground. If battery voltage is present, go to next step. If battery
voltage is not present, check stoplight switch. See
BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. Replace as
necessary. If switch is okay, check connectors to combination meter,
stoplight switch and vacuum pump. Repair as necessary. If connectors
are okay and malfunction remains, check and repair circuit between
cruise control ECU and vacuum pump. If malfunction remains, replace
cruise control ECU.
2) Check connectors and circuit between cruise control ECU
and vacuum pump. See WIRING DIAGRAMS. Repair as necessary. If
connectors and circuit are okay, replace cruise control ECU.
CODE 15: CRUISE CONTROL SWITCH
Code 15 is displayed if RESUME switch or SET switch remains
on. Probable cause is malfunction of cruise control switch. Replace
cruise control switch.
CODE 16: CRUISE CONTROL ECU
Code 16 is displayed if there is an abnormality in CANCEL
hold circuit or microprocessor monitor circuit in cruise control ECU.
Probable cause is malfunction of cruise control ECU. Replace cruise
control ECU.
CODE 17: THROTTLE POSITION SENSOR
Code 17 is displayed if a voltage of 1.5 volts or more exists
when closed throttle position switch is ON or 0.2 volt or less exists
when closed throttle position switch is OFF for a continuous period of
4 seconds or more. Probable causes are:
* Malfunction of throttle position sensor.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.

1) If PCM DTC P0120 (engine performance code) is also set,
see
CLOSED THROTTLE POSITION SWITCH TEST & THROTTLE POSITION SENSOR TEST
under COMPONENT TESTS. If DTC P0120 is not set, go to next step.
2) Check cruise control ECU connector C-50. If connector is
okay, go to next step. If connector is defective, repair as necessary.
3) If malfunction remains, inspect harness between throttle
position sensor and cruise control ECU. Repair as necessary. If
harness is okay, replace cruise control ECU.
PIN VOLTAGE TESTS
Fig. 36: Pin Voltage Chart (1 Of 2)
Courtesy of Mitsubishi Motor Sales of America

* PLEASE READ THIS FIRST *
WARNING: Deactivate air bag system before performing any service
operation. See AIR BAG RESTRAINT SYSTEMS article. Do not
apply electrical power to any component on steering column
without first deactivating air bag system. Air bag may
deploy.
ACTUATOR
Removal & Installation
Disconnect cruise control cable from link. Disconnect
actuator wiring connector. Remove vacuum pump and vacuum pump bracket.
Remove actuator and actuator bracket. To install, reverse removal
procedure.
CRUISE CONTROL ECU
Removal & Installation
Cruise control ECU is located behind center of dash panel.
Remove center trim panel and radio or radio plug bezel. Remove control
unit. To install, reverse removal procedure.
CRUISE CONTROL SWITCH
Removal & Installation
Remove lower steering column cover. Disconnect electrical
connectors. Remove screws attaching cruise control switch to steering
column. Remove switch. To install, reverse removal procedure.
INSTRUMENT CLUSTER
Removal & Installation
Disconnect negative battery cable. Remove cluster cover.
Disconnect speedometer cable. Remove instrument cluster. To install,
reverse removal procedure.
WIRING DIAGRAMS

DEFOGGER - REAR WINDOW
1998 Mitsubishi Montero
1998 ACCESSORIES & EQUIPMENT
Mitsubishi - Rear Window Defoggers
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport,
3000GT
DESCRIPTION & OPERATION
Rear window defogger is a heating filament grid bonded to
inside of window. Rear window defogger is controlled by defogger
switch on instrument panel and a defogger relay.
On Montero, a timer relay controls defogger operation for 9-
11 minutes, then turns defogger off. On Eclipse and Galant, defogger
timer circuit is integral with Electronic Timer Alarm Control System
(ETACS) ECU. Timer will operate defogger for 11 minutes then turn off,\
even with defogger switch in ON position and indicator light
illuminated. On Diamante, timer will operate defogger for 20 minutes,
then turn off.
COMPONENT LOCATIONS
COMPONENT LOCATIONS TABLE








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Component Location
A/C ECU
Diamante ......................... Behind Center Of Dash
Data Link Connector (DLC) ....... Under Left Side Of Dash,
Near Steering Column
Defogger Relay
Montero Sport ....................... Under Left Side Of
Glove Compartment
Except Montero Sport ................... On Relay Block,
Behind Left Side Of Dash
Defogger Timer
Diamante ......................... Integral With A/C ECU
Eclipse & Galant ............... Integral With ETACS-ECU
Montero ...................... Behind Left Side Of Dash,
Behind Speaker
ETACS-ECU ......................... Above Left Kick Panel,
On Junction Block









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TROUBLE SHOOTING
* PLEASE READ THIS FIRST *
NOTE: For additional trouble shooting information on Eclipse and
Galant, see SYMPTOM TESTS.
DEFOGGER DOES NOT WORK
Check for blown fuse, poor contact, defective defogger
switch, poor connection or open wire.
DEFOGGER TIMER INOPERATIVE