1998 MITSUBISHI MONTERO combination switch

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.

Mirage &
Montero Sport ... Behind Right Side Of Instrument Panel (Glove Box)\
Montero ..................................... Right Front Kick Panel
All Others ................................... Behind Center Console









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NOTE: Components are grouped into 2 categories. The first category
covers INPUT DEVICES, which control or produce voltage
signals monitored by Powertrain Control Module (PCM). The
second category covers OUTPUT SIGNALS, which are components
controlled by PCM.
INPUT DEVICES
Vehicles are equipped with different combinations of input
devices. Not all input devices are used on all models. To determine
input device usage on specific models, see appropriate wiring diagram
in L - WIRING DIAGRAMS article. The following are available input
devices.
Air Conditioning Switch
When A/C is turned on, signal is sent to PCM. With engine at
idle, PCM increases idle speed through Idle Air Control (IAC) motor.
Airflow Sensor Assembly
Assembly is mounted inside air cleaner, and incorporates
barometric pressure sensor, intake air temperature sensor and volume
airflow sensor.
Barometric (BARO) Pressure Sensor
Sensor is incorporated into airflow sensor assembly. Sensor
converts barometric pressure to electrical signal, which is sent to
PCM. PCM adjusts air/fuel ratio and ignition timing according to
altitude.
Camshaft Position (CMP) Sensor
On SOHC engines equipped with a distributor, CMP sensor is
located in distributor. On Eclipse (Turbo) and DOHC V6 engines, sensor\
is located beside camshaft, in front of engine. On all other engines,
CMP sensor is a separate unit mounted in place of distributor. PCM
determines TDC based on pulse signals received from sensor, and then
controls MFI timing.
Closed Throttle Position (CTP) Switch
CTP switch is located in the Throttle Position (TP) sensor.
PCM senses whether accelerator pedal is depressed or not. High voltage
(open) or low voltage (closed) signal is input to PCM, which then
controls Idle Air Control (IAC) motor based on input signal.
Crankshaft Position (CKP) Sensor
CKP sensor is located in distributor on SOHC engines, except
1.5L 4-cylinder with California emissions. On DOHC 4-cylinder, DOHC V6
and 1.5L 4-cylinder engines with California emissions, CKP sensor is
located beside crankshaft, in front of engine. PCM determines
crankshaft position on pulse signals received from sensor, and then
controls MFI timing and ignition timing.
Engine Coolant Temperature (ECT) Sensor
ECT sensor converts coolant temperature to electrical signal
for use by PCM. PCM uses coolant temperature information to control
fuel enrichment when engine is cold.
Heated Oxygen Sensor (HO2S)

HO2S detects oxygen content in exhaust gas and sends this
information to PCM. PCM uses input signals from HO2S to vary duration
of fuel injection. HO2S heater stabilizes sensor temperature
regardless of exhaust gas temperature to allow for more accurate
exhaust oxygen content readings.
Idle Air Control (IAC) Valve Position Sensor
Sensor is incorporated in IAC motor. Sensor senses IAC motor
plunger position and sends electrical signal to PCM.
Ignition Timing Adjustment Terminal
Used for adjusting base ignition timing. When terminal is
grounded, PCM timing control function is by-passed, allowing base
timing to be adjusted.
Intake Air Temperature (IAT) Sensor
IAT sensor is incorporated into airflow sensor assembly. This
resistor-based sensor measures temperature of incoming air and
supplies air density information to PCM.
Knock Sensor (KS)
KS is located in cylinder block and senses engine vibration
during detonation (knock). KS converts vibration into electrical
signal. PCM retards ignition timing based on this signal.
Manifold Differential Pressure (MDP) Sensor
MDP sensor converts negative air pressure in intake manifold
plenum into voltage signals sent to PCM. PCM monitors Exhaust Gas
Recirculation (EGR) system using these signals.
Park/Neutral Position (PNP) Switch (Automatic Transmission)
PNP switch senses position of transmission select lever,
indicating engine load due to automatic transmission engagement. Based
on this signal, PCM commands IAC motor to increase throttle angle,
maintaining optimum idle speed.
Power Steering Oil Pressure Switch
Switch detects increase in power steering oil pressure. When
power steering oil pressure increases, switch contacts close,
signaling PCM. PCM commands IAC motor, raising idle speed to
compensate for drop in engine RPM due to power steering load.
Throttle Position (TP) Sensor
TP sensor is a variable resistor mounted on throttle body.
PCM uses voltage signal from TP sensor to determine throttle plate
angle.
Vehicle Speed Sensor (VSS)
Mounted on transaxle/transmission, VSS sends a pulsing signal
to PCM for vehicle speed calculation. PCM uses this calculation for
cruise control and fuel cut-off.
Volume Airflow (VAF) Sensor
Incorporated into airflow sensor assembly, VAF sensor
measures intake airflow rate. Intake air flows through tunnel in
airflow sensor assembly. VAF sensor sends frequency signal to PCM. PCM
uses signal to adjust fuel injection rate.
OUTPUT SIGNALS
NOTE: Vehicles are equipped with various combinations of
computer-controlled components. Not all components listed
below are used on every vehicle. To determine component

These 3 orifices are opened and closed by electric solenoids. The
solenoids are, in turn, controlled by the Electronic Control Module
(ECM). When a solenoid is energized, the armature with attached shaft
and swivel pintle is lifted, opening the orifice. See Fig. 11.
The ECM uses inputs from the Coolant Temperature Sensor
(CTS), Throttle Position Sensor (TPS) and Mass Airflow (MAF) senso\
rs
to control the EGR orifices to make 7 different combinations for
precise EGR flow control. At idle, the EGR valve allows a very small
amount of exhaust gas to enter the intake manifold. This EGR valve
normally operates above idle speed during warm engine operation.
Verify EGR valve is present and not modified or purposely
damaged. Ensure thermal vacuum switches, pressure transducers, speed
switches, etc., (if applicable) are not by-passed or modified. Ensure
vacuum hose(s) to EGR valve is not plugged. Ensure electrical
connector to EGR valve is not disconnected.
Fig. 11: Typical Digital EGR Valve
Courtesy of General Motors Corp.
Integrated Electronic EGR Valve
This type functions similar to a ported EGR valve with a

Spark control systems are designed to ensure the air/fuel
mixture is ignited at the best possible moment to provide optimum
efficiency and power and cleaner emissions.
Ensure vacuum hoses to the distributor, carburetor, spark
delay valves, thermal vacuum switches, etc., are in place and routed
properly. On Computerized Engine Controls (CEC), check for presence of\
required sensors (O2, MAP, CTS, TPS, etc.). Ensure they have not been
tampered with or modified.
Check for visible modification or replacement of the feedback
carburetor, fuel injection unit or injector(s) with a non-feedback
carburetor or fuel injection system. Check for modified emission-
related components unacceptable for use on pollution-controlled
vehicles.
AIR INJECTION SYSTEM (AIS)
Air Pump Injection System (AP)
The air pump is a belt-driven vane type pump, mounted to
engine in combination with other accessories. The air pump itself
consists of the pump housing, an inner air cavity, a rotor and a vane
assembly. As the vanes turn in the housing, filtered air is drawn in
through the intake port and pushed out through the exhaust port. See
Fig. 13 .
Check for missing or disconnected belt, check valve(s),
diverter valve(s), air distribution manifolds, etc. Check air
injection system for proper hose routing.
Fig. 13: Typical Air Pump Injection System
Courtesy of General Motors Corp.
Pulsed Secondary Air Injection (PAIR) System
PAIR eliminates the need for an air pump and most of the
associated hardware. Most systems consists of air delivery pipe(s),
pulse valve(s) and check valve(s). The check valve prevents exhaust
gases from entering the air injection system. See Fig. 14.
Ensure required check valve(s), diverter valve(s), air
distribution manifolds, etc., are present. Check air injection system
for proper hose routing.

This lever is used to select source of airflow. With lever at
fresh air setting, outside air is allowed to enter and/or pass through
heater. With lever at recirculated air setting, air is recirculated
inside passenger compartment.
FRONT BLOWER SWITCH
Front blower switch controls fan speeds to regulate amount of
airflow. Fan speed increases as switch is turned/moved to far right.
COOL AIR BY-PASS KNOB
With heater in floor, defrost/floor or defrost mode, turning
knob to far left allows cool air to enter passenger compartment
through center vent.
FRONT MODE SELECTOR KNOB/LEVER
Depending on position selected, airflow can be directed to
different areas of passenger compartment. Airflow selection
capabilities include individual areas or a combination of windshield,
upper body, knee and/or foot area.
TEMPERATURE CONTROL
Temperature control is adjusted by moving control lever or
turning control knob to left or right. Temperature control cable opens
and closes heater control valve, which determines heat output. Highest
heat setting is attained when lever/knob at far right position. With
temperature lever/knob at cool setting, ambient air is used for
ventilating.
ADJUSTMENTS
FRONT FRESH/RECIRCULATED AIR SELECTOR CABLE
Place air selector lever at recirculated air setting. Press
damper lever inward, in direction of arrow. See Fig. 2. Connect inner
wire of fresh/recirculated air selector cable to damper lever. Secure
outer wire of selector cable with clip.
Fig. 2: Adjusting Front Fresh/Recirculated Air Selector Cable
Courtesy of Mitsubishi Motor Sales of America.
FRONT MODE SELECTOR CABLE

Brake On/Off (BOO) Switch ................... Cruise Control Systems\
Engine Performance
Shift Interlock Systems
Buzzer Module ...................................... Warning Systems
Camshaft Position (CMP) Sensor .................. Engine Performance\
Central Control Module ........................... Anti-Theft System
Clockspring ............................... Air Bag Restraint System
Cruise Control Systems
Steering Column Switches
Clutch Pedal Position Switch .............................. Starters
Clutch Start Switch ....................................... Starters
Combination Meter ......................... Analog Instrument Panels
Constant Control Relay Module (CCRM) ............ Engine Performance\
Electric Cooling Fans
Convenience Center .............................. Power Distribution
Illumination/Interior Lights
Convertible Top Motor ........................ Power Convertible Top
Convertible Top Switch ....................... Power Convertible Top
Crankshaft Position (CKP) Sensor ................ Engine Performance\
Cruise Control Module ....................... Cruise Control Systems
Cruise Control Switch ....................... Cruise Control Systems
Condenser Fan Relay(s) ....................... Electric Cooling Fans\
Data Link Connector (DLC) ....................... Engine Performance\
Daytime Running Lights Module ............... Daytime Running Lights
Exterior Lights
Defogger Relay ................................ Rear Window Defogger
Diagnostic Energy Reserve Module (DERM) ... Air Bag Restraint System\
Discriminating Sensor (Air Bag) ........... Air Bag Restraint System\
Distributor ..................................... Engine Performance
Door Lock Actuators ............................... Power Door Locks
Remote Keyless Entry
Door Lock Relay(s) ................................ Power Door Locks\
Electrochromic Mirror ................................ Power Mirrors
Electronic Level Control (ELC)
Height Sensor .............................. Electronic Suspension
Electronic Level Control (ELC) Module ........ Electronic Suspension\
Engine Coolant Temperature (ECT)
Sending Unit ............................ Analog Instrument Panels
Engine Coolant Temperature (ECT) Sensor ......... Engine Performance\
Engine Control Module ........................... Engine Performance
Generators & Regulators
Starters
ETACS ECU .......................................... Warning Systems
Power Windows
Remote Keyless Entry
Evaporative (EVAP) Emissions Canister ........... Engine Performance\
EVAP Canister Purge Solenoid .................... Engine Performance
EVAP Canister Vent Solenoid ..................... Engine Performance
Exhaust Gas Recirculation (EGR) Valve ........... Engine Performance\
Fuel Tank Vacuum Sensor ......................... Engine Performance
Fog Lights ....................................... Headlight Systems
Daytime Running Lights
Fog Light Relay .................................. Headlight Systems
Daytime Running Lights
Fuel Door Release Solenoid ................. Power Fuel Door Release
Fuel Gauge Sending Unit ................... Analog Instrument Panels
Fuel Injectors .................................. Engine Performance
Fuel Pump ....................................... Engine Performance
Fuel Pump Relay ................................. Engine Performance
Power Distribution
Fuse/Relay Block ................................ Power Distribution
Fusible Links ................................... Power Distribution
Generators & Regulators

speedometer.
TEMPERATURE GAUGE
CAUTION: DO NOT connect sender wire directly to ground during test.
Circuit Test
1) Disconnect temperature sender wire from sending unit.
Connect a 12-volt, 3.4-watt test light between connector terminal and
ground. Turn ignition switch to ON position.
2) If test light flashes and temperature gauge needle moves,
go to SENSOR RESISTANCE TEST. If test light does not flash or gauge
needle does not move, repair wiring to sending unit.
Sensor Resistance Test
1) Remove Engine Coolant Temperature (ECT) sensor from
engine. See COMPONENT LOCATIONS . Place sending unit in 158
F (70C)
water. Check sensor resistance using ohmmeter.
2) ECT sensor resistance should be 90-117 ohms. If ECT sensor
resistance is okay, go to GAUGE RESISTANCE TEST. Replace ECT sensor if
resistance is not as specified.
Gauge Resistance Test
1) Remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. On 3000GT, remove air distribution duct and
combination gauges.
2) On all models, check resistance between temperature gauge
terminals at rear of cluster or combination gauges. See
TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS table. See Fig. 21, 22,
23, 24, 25, 26, 27 or 28.
TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS TABLE









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Application ( 1) Terminals Ohms
Eclipse ............... "A" & "B" .............. 161-197
Eclipse ............... "A" & "C" ................ 51-57
Eclipse ............... "B" & "C" .............. 210-256
Galant ................ "B" & "C" .................. ( 2)
Mirage ................ "A" & "B" ................ 86-95
Mirage ................ "A" & "C" .............. 168-206
Mirage ................ "B" & "C" .............. 222-272
Montero ............... No. 4 & 8 .............. 103-128
Montero ............... No. 4 & 9 .............. 221-271
Montero ............... No. 8 & 9 .............. 130-160
Montero Sport ......... "A" & "B" ................... 88
Montero Sport ......... "A" & "C" .................. 103
Montero Sport ......... "B" & "C" .................. 191
3000GT ................ "A" & "B" ................... 51
3000GT ................ "A" & "C" .................. 139
3000GT ................ "B" & "C" .................. 190
( 1) - See Fig. 21, 22, 23, 24, 25, 26, 27 or 28.
( 2) - With positive battery voltage applied to terminal "A",
battery ground applied to terminal "C" and a 50-ohm
resistor connected between battery ground and terminal
"B", needle should be about 1/4 position on gauge.









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