1998 MITSUBISHI MONTERO air condition

Fig. 30: Identifying Junction Block Connectors & Joint Connectors:
Joint Connector C-132
Courtesy of Mitsubishi Motor Sales of America
Test No. 2
Malfunction of cruise control main switch or cruise control
ECU ground circuit may be present. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
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, repair or replace as
necessary.
2) Disconnect main switch connector C-01. See Fig. 8. At
harness side of connector, measure voltage between connector terminal
No. 1 and ground. If battery voltage is present, go to next step. If
battery voltage is not present, check condition of junction block
connectors C-94 and C-101. If connector(s) are defective, repair as
necessary. If connectors are okay and malfunction remains, check
harness between cruise control main switch and power supply. Repair as
necessary.
3) Check condition of cruise control main switch connector C-
01, joint connector C-132 and cruise control ECU connector C-50.
Repair as necessary. If connectors are okay and malfunction remains,
check harness between cruise control main switch and ground, and
between main switch and cruise control ECU. Repair as necessary.
4) Disconnect cruise control ECU connector C-50. See Fig. 13.
Check for continuity between ground and connector terminals No. 6, 8,
and 14. If continuity is present, go to next step. If continuity is
not present, check condition of connectors between front wiring

harness, dash wiring harness and joint connector C-132. Repair as
necessary. If malfunction remains, check harness between cruise
control main switch and power supply. Repair as necessary.
5) Check condition of cruise control ECU connector C-50.
Repair as necessary. If connector is okay and malfunction persists,
replace cruise control ECU.
Test No. 3
Malfunction of cruise control main switch or cruise control
ECU ground circuit may be present. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of clockspring.
* Malfunction of connector.
* Malfunction of harness.
1) Check cruise control switches. See
CRUISE CONTROL SWITCH TESTS under COMPONENT TESTS. Replace any failed
switch. If switches are okay, check clockspring. See CLOCKSPRING TEST
under COMPONENT TESTS. If clockspring is okay, go to next step.
Replace clockspring if not okay.
2) Disconnect clockspring connector C-128 and measure voltage
between terminal No. 2 and ground. See Fig. 15. If battery voltage is
present, go to next step. If battery voltage is not present, check
condition of IOD connector A-09X, joint connector C-131, junction
block connector C-81, junction block connector C-94 and junction block
connector C-101. Repair as necessary. See Figs. 4, 16, 19, 21, 22, 26,
27 and 29. If connectors are okay and malfunction remains, check
harness between clockspring and power supply. Repair as necessary.
3) Check condition of cruise control ECU connector C-50 and
clockspring connector C-128. Repair as necessary. See Figs. 13 and 15.
If connectors are okay and malfunction remains, check harness between
clockspring and cruise control ECU. Repair as necessary.
Test No. 4
Malfunction of stoplight switch or stoplight circuit may be
present. Probable causes are:
* Malfunction of stoplight switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) If stoplight does not illuminate with brake pedal
depressed, go to next step. If stoplight illuminates with pedal
depressed, replace cruise control ECU.
2) Check stoplight switch. See
BRAKELIGHT/STOPLIGHT SWITCH TEST under COMPONENT TESTS. Replace
stoplight switch as necessary. If stoplight switch is okay, go to next
step.
3) Disconnect stoplight switch connector C-55. See Fig. 14.
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 condition of joint connector C-131 and
junction block connector C-94. Repair as necessary. See Fig. 26. If
connectors are okay and malfunction remains, check harness between
stoplight switch and power supply. Repair as necessary.
4) Check condition of cruise control ECU connector C-50 and
stoplight switch connector C-55. Repair as necessary. If connectors
are okay and malfunction remains, check harness between stoplight
switch and cruise control ECU. Repair as necessary.
Test No. 5

An open circuit in output signal circuit in Neutral range is
likely reason for malfunction. Probable causes are:
* Malfunction of park/neutral switch.
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
Check condition of park/neutral switch connector B-08, dash
harness/transmission harness connector C-124, cruise control ECU
connector C-50 and joint connector C-130. Repair as necessary. If
connectors are okay and malfunction remains, check harness between
park/neutral switch and cruise control ECU. Repair as necessary. If
harness is okay, replace cruise control ECU.
Test No. 6
An open circuit in circuit inside CANCEL switch is likely
caused by a malfunction in cruise control switch. Replace cruise
control switch.
Test No. 7
Because of an open circuit in battery back-up circuit system,
fail-safe function prevents diagnostic trouble codes from being
memorized and displayed even though cruise control is canceled.
Probable causes are:
* Malfunction of connector.
* Malfunction of harness.
* Malfunction of cruise control ECU.
1) Disconnect cruise control ECU connector C-50. See Fig. 13.
At harness side of connector, measure voltage between terminal No. 16
and ground. If battery voltage is present, go to next step. If battery
voltage is not present, check and repair IOD connector A-09X, joint
connector C-132, junction block connector C-81 and junction block
connector C-93 as necessary. See Figs. 4, 16, 19, 20, 26 and 30. If
connectors are okay and malfunction remains, check harness between
cruise control ECU and power supply. Repair as necessary.
2) Check condition of cruise control ECU connector C-50.
Repair as necessary. If connector is okay and malfunction remains,
replace cruise control ECU.
Test No. 8
A malfunction of switches or fail-safe function cancelling
cruise control may be present. Probable causes are:
* Malfunction of cruise control main switch.
* Malfunction of cruise control switch.
* Malfunction of clockspring.
* Malfunction of harnesses or connectors.
* Malfunction of park/neutral position switch.
* Malfunction of cruise control ECU.
1) Attach scan tool to DLC. If scan tool can communicate with
cruise control, go to next step. If scan tool cannot communicate with
cruise control, go to TEST NO. 2.
2) If input switch inspection is possible with scan tool, go
to next step. If input switch inspection is not possible, go to TEST
NO. 3.
3) If input switch Code 21, 22 or 27 are still displayed,
replace cruise control main switch. If codes are no longer displayed,
go to next step.
4) If input switch Code 23 is still displayed, go to TEST NO.

D - ADJUSTMENTS
1998 Mitsubishi Montero
1998 ENGINE PERFORMANCE
Mitsubishi - On-Vehicle Adjustments
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport,
3000GT
ENGINE MECHANICAL
Before performing any on-vehicle adjustments to fuel or
ignition system, ensure engine mechanical condition is okay (i.e.,
engine compression).
VALVE CLEARANCE
VALVE ADJUSTMENT
NOTE: All models use hydraulic valve lifters. Adjustment is not
required.
CHECKING HYDRAULIC VALVE LIFTERS
1) Warm engine to normal operating temperature. Remove valve
cover. Position cylinder No. 1 at TDC on compression stroke. On 4-
cylinder engines, check intake rockers on cylinders No. 1 and 2. Check
exhaust rockers on cylinders No. 1 and 3. On V6 engines, check intake
rockers on cylinders No. 1, 5 and 6. Check exhaust rockers on
cylinders No. 1, 2 and 3.
2) Push downward on end of rocker arm, above lash adjuster.
Rotate crankshaft 360 degrees. On 4-cylinder engines, check intake
rockers on cylinders No. 3 and 4. Check exhaust rockers on cylinders
No. 2 and 4. On V6 engines, check intake rockers on cylinders No. 2, 3
and 4. Check exhaust rockers on cylinders No. 4, 5 and 6. If lash
adjuster is normal, it will feel solid.
3) If lash adjuster moves downward easily when pushed,
replace adjuster. If lash adjuster feels soft or spongy, air has
probably entered lash adjuster. If this occurs, check engine oil
level. If engine oil level is okay, check oil screen and oil screen
gasket for damage.
4) After repairing cause of air ingestion, warm engine to
operating temperature. Drive vehicle at low speed for approximately 5
minutes. Turn engine off for a few minutes.
5) Restart engine and drive at low speed for approximately 5
minutes. Repeat this step several times for about one hour. This helps
remove air from engine oil.
IGNITION TIMING
NOTE: Perform all checks with engine at normal operating
temperature, cooling fan and accessories off, transmission
in Park or Neutral, and front wheels in straight-ahead
position. Ignition timing check procedure for Eclipse 2.0L
non-turbo not available from manufacturer at time of
publication.
Diamante
1) Ignition timing is controlled by Powertrain Control Module
(PCM) and is not adjustable. Manufacturer provides procedure for
checking timing. DO NOT attempt to adjust ignition timing by rotating

distributor.
2) Start engine and warm engine until engine temperature
coolant is 176-203
F (80-95C). Turn engine off. Insert a paper clip
in engine speed detection connector terminal No. 3. See Fig. 1.
Connect a primary voltage detection-type tachometer to paper clip.
Fig. 1: Locating Engine Speed Detection Connector (Diamante)
Courtesy of Mitsubishi Motor Sales of America
3) Install a timing light. Start engine and allow it to idle.
Ensure engine curb idle speed is about 700 RPM. Curb idle speed is
automatically controlled by Idle Air Control (IAC) system. If curb
idle speed is not as specified, see DTC P0505 in G - TESTS W/CODES
article.
CAUTION: MFI system actuator test must be cancelled or test will
continue to run for 27 minutes. Driving vehicle under this
condition may damage engine.
4) Turn engine off. Connect scan tool to Data Link Connector
(DLC). DLC is located below left side of dash, near steering column.
See Fig. 2 . Start engine and allow it to idle. Using scan tool, select
MFI SYSTEM ACTUATOR TEST, then select item 17 (BASIC IGNITION TIMING).\
Press "Y" and read basic ignition timing value. See
IGNITION TIMING SPECIFICATIONS table. If basic ignition timing is
within specification, go to next step. If basic ignition timing is not
within specification, cancel MFI system actuator test. See DTC P0335
in G - TESTS W/CODES article.
5) Read actual ignition timing value. If actual ignition
timing is not within specification, cancel MFI system actuator test.
See DTC P0335 in G - TESTS W/CODES article.

is 600-700 RPM. Turn engine off. Curb idle speed is automatically
controlled by Idle Air Control (IAC) system. If curb idle speed is not\
as specified, see DTC P0505 in G - TESTS W/CODES article.
4) Disconnect waterproof female connector from Brown ignition
timing check connector. See Fig. 4. Using a jumper wire, ground
ignition timing check terminal to read basic ignition timing. Using
timing light, read basic ignition timing value. See
IGNITION TIMING SPECIFICATIONS table. If basic ignition timing is
within specification, go to next step. If basic ignition timing is not
within specification, see DTC P0335 in G - TESTS W/CODES article.
5) Remove jumper wire to read actual ignition timing. Using
timing light, read actual ignition timing value. If actual ignition
timing is not within specification, see DTC P0335 in G - TESTS W/CODES
article.
All Other Models
1) Ignition timing is controlled by Powertrain Control Module
(PCM) and is not adjustable. Manufacturer provides procedure for
checking timing. On models with distributor, DO NOT attempt to adjust
ignition timing by rotating distributor.
2) Connect scan tool to Data Link Connector (DLC). DLC is
located below dash, near steering column. See Fig. 2. Install a timing
light. Start engine and allow it to idle.
3) Using scan tool, read curb idle speed (RPM). Ensure curb
idle speed is about 750 RPM. Turn engine off. Curb idle speed is
automatically controlled by Idle Air Control (IAC) system. If curb
idle speed is not as specified, see DTC P0505 in G - TESTS W/CODES
article.
CAUTION: MFI system actuator test must be cancelled or test will
continue to run for 27 minutes. Driving vehicle under this
condition may damage engine.
4) Using scan tool, select MFI SYSTEM ACTUATOR TEST, then
select item 17 (BASIC IGNITION TIMING). Read basic ignition timing
value. See IGNITION TIMING SPECIFICATIONS table. If basic ignition
timing is within specification, go to next step. If basic ignition
timing is not within specification, cancel MFI system actuator test.
See DTCS P0100 (except Mirage 1.5L), P0105, P0115 and P0335 in G -
TESTS W/CODES article.
5) Read actual ignition timing value. If actual ignition
timing is not within specification, cancel MFI system actuator test.
See DTCS P0100 (except Mirage 1.5L), P0105, P0115 and P0335 in G -
TESTS W/CODES article.
IDLE SPEED & MIXTURE
* PLEASE READ THIS FIRST *
NOTE: Perform adjustments with engine at normal operating
temperature, cooling fan and accessories off, transmission
in Park or Neutral, and front wheels in straight-ahead
position.
BASIC IDLE SPEED
NOTE: Basic idle speed adjustment information on Eclipse 2.0L
non-turbo engine is not available from manufacturer at time
of publication.
3000GT
1) Ensure vehicle is at normal operating temperature with all

Application Curb Idle Basic Idle
1.5L & 1.8L ............ 600-800 ............... 650-750
2.0L
Non-Turbo ............ 700-900 ................... (1)
Turbo ................ 650-850 ............... 700-800
2.4L ................... 650-850 ............... 700-800
3.0L & 3.5L ............ 600-800 ............... 650-750
( 1) - Information is not available from manufacturer at time
of publication.









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NOTE: Basic idle speed should only be adjusted after verifying
spark plugs, fuel injectors, idle air control motor and
engine compression are okay.
All Other Models
1) Ensure vehicle is at normal operating temperature with all
lights, cooling fan and accessories off. Shift transmission into
Neutral or Park position.
2) Basic idle speed can only be adjusted using a scan tool to
ground Data Link Connector (DLC). Connect scan tool to DLC. DLC is
located below dash, near steering column. See Fig. 2.
3) Start engine and allow it to idle. Using scan tool, select
MFI SYSTEM ACTUATOR TEST, then select item 30. Check basic idle speed.
See IDLE SPEED SPECIFICATIONS table.
CAUTION: MFI system actuator test must be cancelled or test will
continue to run for 27 minutes. Driving vehicle under this
condition may damage engine.
4) Cancel MFI system actuator test. If idle speed is not
within specification, turn engine speed adjusting screw until correct
engine speed is obtained. See Fig. 6. Access to speed adjusting screw
is obtained by removing rubber plug on throttle body.
5) If idle speed cannot be lowered by turning engine speed
adjusting screw, determine if fixed Speed Adjusting Screw (SAS). Fixed\
SAS is stop screw contacting throttle lever. See
FIXED SPEED ADJUSTING SCREW for procedure.
6) After all adjustments are verified to be correct, possible
cause of incorrect idle speed is deterioration of Idle Air Control
(IAC) circuit. See DTC P0505 in G - TESTS W/CODES article.
CURB (SLOW) IDLE SPEED
NOTE: Curb idle speed is controlled by Idle Air Control (IAC)
motor. Adjustment is usually not necessary. For curb idle
speed specifications, see IDLE SPEED SPECIFICATIONS table
under BASIC IDLE SPEED.
1) Check ignition timing and adjust if necessary. See
IGNITION TIMING . Run engine at 2000-3000 RPM for more than 5 seconds.
Allow engine to idle for 2 minutes. Check curb idle speed.
2) If curb idle speed is not within specification, check IAC
system. See DTC P0505 in G - TESTS W/CODES article. If IAC system is
okay, adjust basic idle speed. See BASIC IDLE SPEED.
FIXED SPEED ADJUSTING SCREW
NOTE: Fixed Speed Adjusting Screw (SAS) is preset by manufacturer
and usually does not require adjustment. Only adjust fixed
SAS if other adjustment procedures require it, or if

NOTE: Remove window defogger switch and disconnect switch
connector for the following test.
Diamante
Rear window defogger is integral with and controlled by A/C
system ECU. To diagnose system, refer to AIR CONDITIONING & HEATING
SERVICE & REPAIR article.
Eclipse
Turn defogger switch to OFF position. Using ohmmeter, check
switch continuity. Continuity should be present between terminals No.
1 and 3, and terminals No. 2 and 6. Turn defogger switch to ON
position. Continuity should be present between terminals No. 1, 3 and
4, and between terminals No. 2 and 6. See Fig. 5. If continuity is not
as specified, replace switch.
Galant
Turn defogger switch to OFF position. Using ohmmeter, check
switch continuity. Continuity should be present between terminals No.
1 and 3. Turn defogger switch to ON position. Continuity should exist
between terminals No. 2, 4 and 6, and between terminals No. 1 and 3.
See Fig. 5 . If continuity is not as specified, replace switch.
Mirage
Turn defogger switch to OFF position. Using ohmmeter, check
switch continuity. Continuity should be present between terminals No.
1 and 3, and terminals No. 2 and 6. Turn defogger switch to ON
position. Continuity should exist between terminals No. 1 and 3, and
terminals No. 2, 4, 5 and 6. See Fig. 5. If continuity is not as
specified, replace switch.
Montero
Turn defogger switch to OFF position. Using ohmmeter, check
switch continuity. Continuity should be present between terminals No.
1 and 3, and terminals No. 4 and 5. Turn defogger switch to ON
position. Continuity should exist between terminals No. 1 and 3,
terminals No. 4 and 5, and between terminals No. 2 and 6. See Fig. 5.
If continuity is not as specified, replace switch.
Montero Sport
Turn defogger switch to OFF position. Using ohmmeter, check
switch continuity. Continuity should be present between terminals No.
1 and 5, and terminals No. 2 and 6. Turn defogger switch to ON
position. Continuity should be present between terminals No. 3 and 4,
terminals No. 1 and 5, and between terminals No. 2 and 6. See Fig. 5.
If continuity is not as specified, replace switch.
3000GT
1) Remove defogger switch assembly from instrument cluster
bezel. With defogger switch in OFF position, check switch continuity
using ohmmeter.
2) Continuity should exist between terminals No. 3 and 4.
With defogger switch in ON position, continuity should exist between
terminals No. 1 and 2, terminals No. 1 and 6, and between terminals
No. 3 and 4. See Fig. 6. If continuity is not as specified, replace
switch.
Fig. 5: Identifying Defogger Switch Terminals (Eclipse, Galant,
Mirage, Montero & Montero Sport)
Courtesy of Mitsubishi Motor Sales of America