2005 MITSUBISHI 380 relay

ON-VEHICLE SERVICE
HEATER, AIR CONDITIONING AND VENTILATION55-149
A/C COMPRESSOR CLUTCH RELAY CONTINUITY
CHECK
IDLE-UP OPERATION CHECK
M1552001600401
Before inspection and adjustment, set vehicle in the following
condition:
Engine coolant temperature: 80 90 C (176.0 194.0 F)
Lights, electric cooling fan and accessories: OFF
Transmission: Neutral ("N" or "P" position)
Steering wheel: Straightforward
1. Check whether or not the idle speed is the standard value.
Standard value: 680
50 r/min
2. Turn on the air conditioning switch and the blower speed
selection dial. Engine idling speed should be within the
standard value:
Standard value: 680
50 r/min
NOTE: The Electronic control unit determines whether the
A/C load is low or high according to the output signal from
the A/C-ECU.
NOTE: It is not necessary to make an adjustment, because
the idling speed is automatically controlled by the ENGINE
ECU. BATTERY
V O LTA G ETESTER
CONNECTIONSPECIFIED
CONDITION
Not applied 1
4 Open circuit
Connect
terminal 2 to the
positive battery
terminal
Connect
terminal 3 to the
negative battery
terminal1
4 Less than 2 ohms

70-1
GROUP 70
COMPONENT
LOCATIONS
CONTENTS
FUSIBLE LINK, FUSE AND IOD OR
STORAGE CONNECTOR . . . . . . . . .70-2
GROUNDING CABLE . . . . . . . . . . . .70-3
GROUNDING . . . . . . . . . . . . . . . . . . .70-4
RELAY . . . . . . . . . . . . . . . . . . . . . . . .70-6INSPECTION TERMINAL . . . . . . . . . .70-8
SENSOR . . . . . . . . . . . . . . . . . . . . . . .70-8
CONTROL UNIT . . . . . . . . . . . . . . . . .70-14
OTHER DEVICES . . . . . . . . . . . . . . . .70-18
SOLENOID AND SOLENOID VALVE70-17

RELAY
COMPONENT LOCATIONS70-6
RELAYM1701000400381
NAME SYMBOL NAME SYMBOL
A/C compressor clutch relay A Fuel pump relay (2) C
A/T control relay A Horn relay A
Accessory socket relay C Rear window defogger relay C
Blower relay C MPI relay A
Fan control relay A Power window relay C
Fog Lamp relay A Rear window defogger relay C
Fuel pump relay (1) C

RELAY
COMPONENT LOCATIONS70-7

00E-1
GROUP 00E
GENERAL

CONTENTS
HARNESS CONNECTOR
INSPECTION . . . . . . . . . . . . . . . . . . .00E-2
HOW TO DIAGNOSE . . . . . . . . . . . . .00E-2
HOW TO DIAGNOSE . . . . . . . . . . . . . . . . . 00E-2
TROUBLESHOOTING STEPS . . . . . . . . . . 00E-3
INFORMATION FOR DIAGNOSIS . . . . . . . 00E-3
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 00E-4INSPECTION INSTRUMENTS . . . . . . . . . . 00E-5
CHECKING FUSES . . . . . . . . . . . . . . . . . . . 00E-6
CHECKING SWITCHES . . . . . . . . . . . . . . . 00E-7
CHECKING RELAYS . . . . . . . . . . . . . . . . . 00E-8
CABLES AND WIRES CHECK . . . . . . . . . . 00E-9
BATTERY HANDLING . . . . . . . . . . . . . . . . 00E-9
GENERAL ELECTRICAL SYSTEM CHECK00E-9

HOW TO DIAGNOSE
GENERAL 00E-4
INSPECTIONM1001004600139
1. Sight and sound checks
Check relay operation, blower motor rotation, light
illumination, etc. Listen for a "click" when some relay covers
are pushed down.
2. Simple checks
For example, if a headlight does not come on and a faulty
fuse or poor grounding is suspected, replace the fuse with a
new one. Or use a jumper wire to ground the light to the
body. Determine which part(s) is/are responsible for the
problem.
3. Checking with instruments
Use an appropriate instrument in an adequate range and
read the indication correctly.

HOW TO DIAGNOSE
GENERAL 00E-8
CHECKING RELAYSM1001004900152
1. By using a relay, a heavy current can be turned on and off by
a switch using much less current. For example, in the circuit
shown here, when the switch is turned on (closed), current
flows to the coil of the relay. Then, its contact is turned on
(closed) and the light comes on. The current flowing through
the switch is much less than that for the light.
2. When current flows through the coil of a relay, its core is
magnetized to attract the iron piece, closing (ON) the
contact at the tip of the iron piece. When the coil current is
turned off, the iron piece returns to its original position by a
spring, opening the contact (OFF).
3. Relays may be classified as the normally open-type or the
normally closed-type, depending on their contact
construction.
NOTE: The deenergised state means that no current is flow-
ing through the coil. The energised state means that current
is flowing through the coil.
(1) The normally open-type
When a normally open relay as illustrated here is
checked, there should be no continuity between terminals
3 and 4 when the relay is deenergised. There should be
continuity between terminals 3 and 4 when battery
voltage and ground are applied to terminals 1 and 2. The
relay condition is determined by this check.
NOTE: Check the relay in both situation which is
energised and is not energised.
(2) The normally closed-type
When a normally closed relay as illustrated here is
checked, there should be continuity between terminals 3
and 4 when the relay is deenergised. There should be no
continuity between terminals 3 and 4 when battery
voltage and ground are applied to terminals 1 and 2. The
relay condition is determined by this check.
NOTE: Check the relay in both situation which is
energised and is not energised.

HOW TO DIAGNOSE
GENERAL 00E-9
CABLES AND WIRES CHECKM1001005100041
1. Check connections for looseness, rust, and stains.
2. Check terminals and wires for corrosion.
3. Check terminals and wires for open circuit or impending
open circuit.
4. Check wire insulation and coating for damage, cracks, and
wear.
5. Check conductive parts of terminals for contact with other
metallic parts (vehicle body and other parts).
6. Check grounding parts to verify that there is complete
continuity between attaching bolt(s) and vehicle body.
7. Check for incorrect wiring.
8. Check that harnesses are secured to prevent contact with
sharp edges and corners or hot parts (exhaust manifold,
pipe, etc.).
9. Check that harnesses are secured firmly to provide enough
clearance from the fan pulley, fan belt, and other rotating or
moving parts.
10.Check that the harnesses between fixed parts (such as the
vehicle body) and vibrating parts (such as the engine) are
long enough to allow for vibration and movement.
BATTERY HANDLINGM1001005200048
Battery posts, terminals and related accessories con-
tain lead and lead compounds. WASH HANDS AFTER
HANDLING.
When checking or servicing does not require power from the
vehicle battery, be sure to disconnect the cable from the battery
(
) terminal. This will prevent problems that could be caused by
a short circuit. Disconnect the (
) battery terminal first and
reconnect it last.
GENERAL ELECTRICAL SYSTEM CHECKM1001005300045
A circuit consists of the power supply, switch, relay, load,
ground, etc. There are various methods to check a circuit
including an overall check, voltage check, short-circuit check,
and continuity check. Each of the methods briefly described
below applies only to circuits similar to the illustration.