1998 MITSUBISHI MONTERO turn signal

Check defogger switch or defogger timer. See COMPONENT TESTS.
INDICATOR LIGHT DOES NOT WORK
Check for burned out bulb, open circuit or poor connection.
INDICATOR LIGHT IS DIM
Check rheostat or indicator bulb.
SYMPTOM TESTS
INPUT SIGNAL INSPECTION
NOTE: The following information only applies to Eclipse and Galant.
NOTE: Perform input signal inspection before proceeding with
SYSTEM TESTS .
Eclipse & Galant
1) Input signal inspection can be performed using scan tool
or an analog voltmeter. To perform inspection using scan tool, go to
next step. To perform inspection using an analog voltmeter, go to step
3).
2) Turn ignition off. Connect scan tool to Data Link
Connector (DLC). Turn ignition on and then off. If buzzer on scan tool\
sounds when ignition was turned on, ECU input signal is normal. If
buzzer did not sound, go to SYSTEM TESTS.
3) Turn ignition off. Connect DTC Check Harness (MB991529) t\
o
DLC terminals No. 4 or 5 (ground) and terminal No. 9. See Fig. 1.
Connect voltmeter leads to check harness leads. Turn ignition switch
on, then off. If voltmeter deflects once when ignition was turned on,
ECU input signal is normal. If voltmeter did not deflect, go to
SYSTEM TESTS .
Fig. 1: Identifying Data Link Connector (DLC) Terminals
Courtesy of Mitsubishi Motor Sales of America
SYSTEM TESTS

NOTE: The following information only applies to Eclipse and Galant.
NOTE: Perform INPUT SIGNAL INSPECTION before proceeding with
SYSTEM TESTS. To identify circuit connector terminals, see
WIRING DIAGRAMS .
Communication With All Systems Not Possible (Eclipse &
Galant)
1) Check voltage between ground and Data Link Connector (DLC)\
terminal No. 16 (Red/Black wire on Eclipse or Brown/Red wire on
Galant). See Fig. 1. If battery voltage is present, go to step 3). If
battery voltage is not present, go to next step.
2) Check junction block connectors between DLC and power
supply. See WIRING DIAGRAMS . If connectors are okay, check circuit
between power supply and DLC. See WIRING DIAGRAMS. Repair as
necessary.
3) Check continuity between ground and DLC terminals No. 4
and 5. If continuity is present, replace scan tool and retest. If
continuity is not present, check circuit between ground and DLC. See
WIRING DIAGRAMS . Repair as necessary.
Communication With One-Shot Pulse Input Signal Only Is Not
Possible (Eclipse & Galant)
Check circuit between DLC and junction block No. 1. See
WIRING DIAGRAMS . Repair as necessary. If circuit is okay, check
harness connectors to ETACS-ECU, DLC and junction/joint connectors.
Repair as necessary. If connectors are okay, replace ECU.
Defogger Does Not Operate With Defogger Switch ON (Eclipse &
Galant)
1) Check defogger switch input signal. See
INPUT SIGNAL INSPECTION . If switch input signal is okay, check
defogger circuit and relay. See DEFOGGER RELAY TEST under COMPONENT
TESTS. Repair or replace as necessary. If switch input signal is not
okay, go to next step.
2) Check defogger switch. See DEFOGGER SWITCH TEST under
COMPONENT TESTS. Replace as necessary. If defogger switch is okay,
turn ignition on. Check voltage between ground and defogger switch
harness-side connector terminal No. 4 (Eclipse) or terminal No. 2
(Galant). See WIRING DIAGRAMS . If voltage reading is 5 volts (Eclipse)
or battery voltage (Galant), go to next step. If voltage reading is
not as specified, go to step 4).
3) Check joint/junction connectors between switch, instrument
panel cluster and ETACS-ECU. See WIRING DIAGRAMS. Repair as necessary.
If connectors are okay, check circuit between defogger switch and
ground. Repair as necessary. If circuit is okay, replace ECU.
4) Check harness connectors to ETACS-ECU and instrument panel
cluster. Repair as necessary. If connectors are okay, check circuit
between ECU and defogger switch. Repair as necessary.
Defogger Relay Circuit System Check (Eclipse & Galant)
1) Check defogger relay. See DEFOGGER RELAY TEST under
COMPONENT TESTS. Replace as necessary. If relay is okay, go to next
step.
2) Check voltage between ground and relay harness-side
connector terminals No. 3 and 5. See WIRING DIAGRAMS. If battery
voltage is present, go to next step. If battery voltage is not
present, go to step 4).
3) Check harness connectors to relay, ETACS-ECU, junction
block and rear wiring/liftgate. See WIRING DIAGRAMS. Repair as
necessary. If connectors are okay, check circuit between defogger
relay and rear defogger, defogger and ground, or defogger relay and
ECU. See WIRING DIAGRAMS . Repair as necessary. If circuits are okay,

TRANSMITTER PROGRAMMING
NOTE: Transmitter programming should be performed only after
verifying that door lock operates normally using key.
NOTE: Ensure ignition is off when connecting or disconnecting scan
tool.
Using Scan Tool (Montero & 3000GT)
1) Connect scan tool to DLC. Close all doors. Turn ignition
switch to ACC position, then to OFF position. Press desired
transmitter switches (secret code), then press twice within 10 seconds\
to register code.
2) Lock and unlock door once. If there are 2 transmitters,
program the first, then the second transmitter using the same
procedure within one minute. After completing the second programming,
lock and unlock door once.
3) Programming mode is finalized when programming of second
transmitter secret code is complete, one minute after setting secret
code, when scan tool is disconnected, when ignition is turned on or
when any door is opened.
Without Scan Tool (Montero)
1) Move code registration switch on RKE control unit to SET I
position. Press the LOCK or UNLOCK button on transmitter. Move code
registration switch on control unit to FIX position.
2) Confirm that keyless entry system operates normally. If
system does not operate normally, repeat step 1). If 2 transmitters
are used, register code on SET II position on RKE control unit and set
in same manner as the first transmitter.
TROUBLE SHOOTING
POWER DOOR LOCK INOPERATIVE
Operate door lock(s) with ignition switch in OFF position. If\
door lock(s) do not operate, check for following possible causes:
* Burned fuse, circuit breaker or fusible link caused by short
to body ground.
* Wire connector, or pin inside connector, disengaged at any
connector or component in system.
* Defective ETACS-ECU (if equipped).
* Defective door lock switch, relay or actuator.
* Subfreezing weather conditions, mechanical failure, or
corroded or misaligned assemblies.
KEY REMINDER SYSTEM INOPERATIVE (ETACS-ECU CONTROLLED SYSTEM)
With key inserted in ignition switch, lock driver's or
passenger's door and close door. If door locks do not unlock, check
for following possible causes:
* Defective key reminder switch or no input signal to
ETACS-ECU.
* Defective front door switch or no input signal to ETACS-ECU.
* Defective vehicle speed sensor or no input signal to
ETACS-ECU.
INPUT SIGNAL

Scan Tool Method (3000GT)
Turn ignition off. Connect scan tool to DLC. Follow scan tool
manufacturer's instructions. Turn ignition on. Perform ON/OFF
operation of each door lock or power window switch. If scan tool
buzzer sounds once, ECU input signal to corresponding switch circuit
is normal.
Voltmeter Method (3000GT)
Using Diagnostic Trouble Code Check Harness (MB991529),
connect harness to DLC terminals No. 4 and 5. Connect voltmeter to
harness. Turn ignition on. Perform ON/OFF operation of each door lock
or power window switch. If voltmeter pointer moves once, ECU input
signal from corresponding switch circuit is normal.
COMPONENT TESTS
* PLEASE READ THIS FIRST *
NOTE: If after all testing procedures are completed, system is not
functioning properly, substitute with a known-good ETACS-ECU
and retest.
DOOR LOCK ACTUATOR
Left Front Door (Montero & 3000GT)
1) Access left front door lock actuator. See
DOOR LOCK ACTUATOR R & I under REMOVAL & INSTALLATION. Disconnect
harness connector. Set actuator in LOCK position. Connect positive
lead of 12-volt power source to actuator terminal No. 1 (Blue/Red
wire) on Montero or terminal No. 3 (Blue/Red wire) on 3000GT. See
WIRING DIAGRAMS . Actuator should move to UNLOCK position when terminal
No. 3 (White/Black wire) on Montero or terminal No. 1 (Blue/Black
wire) on 3000GT is connected to ground.
2) With actuator set in UNLOCK position, connect positive
lead of 12-volt power source to actuator terminal No. 3 (White/Black
wire) on Montero or terminal No. 1 (Blue/Black wire) on 3000GT. See
WIRING DIAGRAMS . Actuator should move to LOCK position when terminal
No. 1 (Blue/Red wire) on Montero or terminal No. 3 (Blue/Red wire) o\
n
3000GT is connected to ground.
3) On 3000GT, check for continuity between actuator terminals
No. 2 (Brown/Yellow wire) and No. 4 (Black wire). See WIRING DIAGRAMS.
Continuity should be present with actuator set in UNLOCK position.
Continuity should not be present with actuator set to LOCK position.
Right Front Door (Montero & 3000GT)
1) Access right front door lock actuator. See
DOOR LOCK ACTUATOR R & I under REMOVAL & INSTALLATION. Disconnect
harness connector. Set actuator in LOCK position. Connect positive
lead of 12-volt power source to actuator terminal No. 3 (Blue/Red
wire) on Montero or terminal No. 1 (Blue/Red wire) on 3000GT. See
WIRING DIAGRAMS . Actuator should move to UNLOCK position when terminal
No. 1 (White/Black wire) on Montero or terminal No. 3 (Blue/Black
wire) on 3000GT is connected to ground.
2) With actuator set in UNLOCK position, connect positive
lead of 12-volt power source to actuator terminal No. 1 (White/Black
wire) on Montero or terminal No. 3 (Blue/Black wire) on 3000GT. See
WIRING DIAGRAMS . Actuator should move to LOCK position when terminal
No. 3 (Blue/Red wire) on Montero or terminal No. 1 (Blue/Red wire) o\
n
3000GT is connected to ground.
3) On 3000GT, check for continuity between actuator terminals
No. 2 (Brown wire) and No. 4 (Black wire). See WIRING DIAGRAMS.
Continuity should be present with actuator set in UNLOCK position.

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)

pressure regulator diaphragm opens relief valve, allowing pressure to
bleed off through fuel return line, reducing fuel pressure.
As engine manifold vacuum decreases (open throttle), fuel
pressure regulator diaphragm closes valve, preventing pressure from
bleeding off through fuel return line, increasing fuel pressure.
FUEL CONTROL
Fuel Injectors
Fuel is supplied to engine through electronically pulsed
(timed) injector valves located on fuel rail(s). PCM controls amount\
of fuel metered through injectors based on information received from
sensors.
IDLE SPEED
Air Conditioning (A/C) Relay
When A/C is turned on with engine at idle, PCM signals IAC
motor to increase idle speed. To prevent A/C compressor from switching
on before idle speed has increased, PCM momentarily opens A/C relay
circuit.
Idle Air Control (IAC) Motor
Motor controls pintle-type air valve to regulate volume of
intake air at idle.
During start mode, PCM controls idle intake air volume
according to Engine Coolant Temperature (ECT) sensor input. After
starting, with idle position switch activated (throttle closed), fast
idle speed is controlled by IAC motor and fast idle air control valve
(if equipped).
When idle switch is deactivated (throttle open), IAC motor
moves to a preset position in accordance with ECT sensor input.
PCM signals IAC motor to increase engine RPM in the following
situations: A/T (if applicable) is shifted from Neutral to Drive, A/C
is turned on, or power steering pressure reaches a preset value.
IGNITION SYSTEMS
DIRECT IGNITION SYSTEM (DIS)
Depending on number of cylinders, ignition system is a 2 or
3-coil, distributorless ignition system. On Eclipse (Turbo) and DOHC
V6 engines, Camshaft Position (CMP) sensor is located beside camshaft,\
in front of engine. On all other engines equipped with DIS, CMP sensor
is a separate unit mounted in place of distributor. On DOHC 4-
cylinder, DOHC V6 and 1.8L 4-cylinder engines with California
emissions, Crankshaft Position (CKP) sensor is located beside
crankshaft, in front of engine. PCM determines TDC based on pulse
signals received from sensors and then controls MFI and ignition
timing.
Power Transistors & Ignition Coils
Based on crankshaft position and CMP sensor inputs, PCM
controls timing and directly activates each power transistor to fire
coils. On 4-cylinder engines, power transistor "A" controls primary
current of ignition coil "A" to fire spark plugs on cylinders No. 1
and No. 4 at the same time. Power transistor "B" controls primary
current of ignition coil "B" to fire spark plugs on cylinders No. 2
and No. 3 at the same time. On V6 engines, companion cylinders No. 1
and 4, 2 and 5, and 3 and 6 are fired together.
On all models, although each coil fires 2 plugs at the same
time, ignition takes place in only one cylinder, since the other

When engine is off, fuel vapors are vented into charcoal
canister. When engine is warmed to normal operating temperature and
running at speeds greater than idle, PCM energizes purge control
solenoid valve, allowing vacuum to purge valve.
Canister vapors are then drawn through solenoid valve into
intake manifold for burning. Purge control solenoid valve remains
closed during idle and engine warm-up to reduce HC (hydrocarbons) and
CO (carbon monoxide) emissions.
POSITIVE CRANKCASE VENTILATION (PCV) VALVE
PCV valve operates in closed crankcase ventilation system.
Closed crankcase ventilation system consists of PCV valve, oil
separator, breather and ventilation hoses.
PCV valve is a one-way check valve located in valve cover.
When engine is running, manifold vacuum pulls PCV valve open, allowing
crankcase fumes to enter intake manifold. If engine backfires through
intake manifold, PCV valve closes to prevent crankcase combustion.
SELF-DIAGNOSTIC SYSTEM
NOTE: PCM diagnostic memory is retained by direct power supply
from battery. Memory is not erased by turning off ignition,
but it will be erased if battery or PCM is disconnected.
Self-diagnostic system monitors input and output signals
through the Data Link Connector (DLC). Diagnostic Trouble Codes (DTCs\
)
can only be read using a scan tester. For additional information, see
G - TESTS W/CODES article.
Malfunction Indicator Light (MIL)
MIL (CHECK ENGINE light) comes on when ignition is turned on.\
MIL remains on for several seconds after engine has started. If an
abnormal input signal occurs, MIL comes on and code is stored in
memory. If an abnormal input signal returns to normal, PCM turns MIL
off, but code remains stored in memory until it is cleared. If
ignition is turned on again, MIL will not come on until PCM detects
malfunction during system operation.

Taillight Relay In engine compartment
relay box.
Turn Signal & Hazard Flasher Unit On bracket, behind left side
of dash.









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CIRCUIT PROTECTION DEVICES









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Component Component Location








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ABS Relay Box In right rear corner of
engine compartment.