Mitsubishi Lancer Evolution 7. Manual — part 215
ENGINE COOLING -
Special Tools/Troubleshooting
14-3
SPECIAL TOOLS
Tool
Number
Name
Use
A
B
C
D
MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness
adapter
D: Probe
D
Measurement of terminal voltage
D
Inspection of radiator fan controller
A: Connector pin contact pressure
inspection
B: Power circuit inspection
C: Power circuit inspection
D: Commercial tester connection
MB991658
Test harness
Inspection of radiator fan controller
APS
MB991791
Throttle cotroller
Inspection of radiator fan controller
[Use the accelerator pedal position sensor
disconnected from harness.]
TROUBLESHOOTING
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptoms
Inspection procedure
No.
Reference page
Radiator fan does not operate.
1
14-3
Radiator fan does not change speed or stop.
2
14-5
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Radiator fan does not operate.
Probable cause
Failure may occur on the power supply of the radiator fan controller and the
earth circuit.
Failure may also occur on the radiator fan controller and engine-ECU.
D
Malfunction of fusible link
D
Malfunction of radiator fan relay
D
Malfunction of radiator fan controller
D
Malfunction of radiator fan motor
D
Malfunction of engine-ECU
D
Malfunction of harness, connector
ENGINE COOLING -
Troubleshooting
14-4
Measure at the engine-ECU connector C-126.
D
Connect the connector.
D
Pull out the teminal No.21 to disconnect it
(Ignition switch: ON)
OK: Radiator fan motor is rotated.
YES
Engine-ECU terminal voltage check
(Refer to GROUP 13A - Troubleshooting.)
NO
Replace the radiator fan controller.
NG
Repair
OK
NG
Repair
OK
Check the harness wire between radiator fan controller and
engine-ECU.
Measure at the engine-ECU connector C-126.
<Vehicles without A/C>
D
Connect the connector.
D
Voltage between terminal 21 and body earth
(Engine: Idling, engine coolant temperature: 95_C or more)
OK: 0.7 V or more
<Vehicles with A/C>
D
Connect the connector.
D
Voltage between terminal 21 and body earth
(Engine: Idling, A/C switch: ON)
OK: 0.7 V or more (When A/C compressor is operating)
NG
(2) NG
Check the harness wire between radiator fan controller and
body earth, and repair if necessary.
OK
Measure at the radiator fan controller connector A-21.
D
Disconnect the connector, and measure at the harness
side.
(1) Voltage between terminal 3 and body earth
(Ignition switch: ON)
OK: Battery voltage
(2) Continuity between terminal 1 and body earth
OK: Continuity
(1) NG
Check the harness wire between radiator fan controller and
radiator fan relay, and repair if necessary.
(3) NG
Check the harness wire between radiator fan relay and body
earth, and repair if necessary.
(2) NG
Check the harness wire between radiator fan relay and engine
control relay, and repair if necessary.
OK
Measure at the radiator fan control relay connector A-09X.
D
Remove the relay, and measure at the relay box side.
(1) Voltage between terminal 4 and body earth
OK: Battery voltage
(2) Voltage between terminal 1 and body earth
(Ignition switch: ON)
OK: Battery voltage
(3) Continuity between terminal 3 and body earth
OK: Continuity
(1) NG
Check the harness wire between radiator fan relay and fusible
link (2), and repair if necessary.
D
Fusible link (2) check
D
Radiator fan relay continuity check
(Refer to P.14-8.)
D
Radiator fan motor check (Refer to P.14-10.)
NG
Replace
OK
OK
Engine-ECU terminal voltage check
(Refer to GROUP 13A - Troubleshooting.)
Check the following connectors:
<L.H. drive vehicles> C-126, A-13, A-21
<R.H. drive vehicles> C-126, C-136, A-21
NG
Check the trouble symptoms.
ENGINE COOLING -
Troubleshooting
14-5
Inspection Procedure 2
Radiator fan does not change speed or stop.
Probable cause
Radiator fan controller uses the signal from engine-ECU to control radiator fan
motor in a continously variable mode.
D
Malfunction of radiator fan relay
D
Malfunction of radiator fan controller
D
Malfunction of engine-ECU
D
Malfunction of harness, connector
Measure at the engine-ECU connector C-126.
D
Connect the connector.
D
Pull out the teminal No.21 to disconnect it
(Ignition switch: ON)
OK: Radiator fan motor is rotated.
D
Connect the teminal No.21 to the body earth
(Ignition switch: ON)
OK: Radiator fan motor stop running.
YES
Engine-ECU terminal voltage check
(Refer to GROUP 13A - Troubleshooting.)
NO
Replace the radiator fan controller.
OK
Radiator fan controller check (Refer to P.14-8.)
NG
Replace the radiator fan controller.
OK
Measure at the engine-ECU connector C-126.
<Vehicles without A/C>
D
Connect the connector.
D
Voltage between terminal 21 and body earth
(Engine: Idling, engine coolant temperature: 80_C or less)
OK: 0 - 0.3 V
(Engine: Idling, engine coolant temperature: 95_C or more)
OK: 0.7 V or more
<Vehicles with A/C>
D
Connect the connector.
D
Voltage between terminal 21 and body earth
(Engine: Idling, engine coolant temperature: 80_C or less)
OK: 0 - 0.3 V
(Engine: Idling, A/C switch: ON)
OK: 0.7 V or more (When A/C compressor is operating)
NG
OK
D
Check the harness wire between radiator fan relay and
engine control relay.
D
Check the harness wire between radiator fan relay and
body earth.
D
Check the harness wire between radiator fan relay and
radiator fan controller.
NG
Repair
NG
Replace
OK
OK
OK
Check the following connectors:
<L.H. drive vehicles> C-126, A-13, A-21
<R.H. drive vehicles> C-126, C-136, A-21
NG
Engine-ECU terminal voltage check
(Refer to GROUP 13A - Troubleshooting.)
Check the trouble symptoms.
NG
NG
Repair
Repair
Radiator fan relay continuity check (Refer to P.14-8.)
Check the harness wire between radiator fan controller and
engine-ECU.
ENGINE COOLING -
On-vehicle Service
14-6
ON-VEHICLE SERVICE
ENGINE COOLANT LEAK CHECKING
1. Confirm that the coolant level is up to the filler neck.
Install a radiator cap tester and apply 160 kPa pressure,
and then check for leakage from the radiator hose or
connections.
Caution
(1) Be sure to completely clean away any moisture
from the places checked.
(2) When the tester is taken out, be careful not to
spill any coolant from it.
(3) Be careful, when installing and removing the tester
and when testing, not to deform the filler neck
of the radiator.
2. If there is leakage, repair or replace the appropriate part.
RADIATOR CAP OPENING PRESSURE CHECK
1. Use a cap adapter to attach the cap to the tester.
2. Increase the pressure until the indicator of the gauge
stops moving.
Limit: 83 kPa
Standard value: 93 - 123 kPa
3. Replace the radiator cap if the reading does not remain
at or above the limit.
NOTE
Be sure that the cap is clean before testing, since rust
or other foreign material on the cap seal will cause an
improper indication.
ENGINE COOLANT REPLACEMENT
1. Remove the under cover.
(Refer to GROUP 51 - Front Bumper.)
2. Drain the engine coolant by removing the drain plug and
then the radiator cap.
Cap adapter
Adapter
Cap adapter
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