Mitsubishi Lancer Evolution X. Manual — part 282
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-193
STEP 5. Check the engine coolant temperature sensor.
Refer to Engine Coolant Temperature Sensor Check
.
Q: Is the engine coolant temperature sensor normal?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 6.
NO : Replace the engine coolant temperature sensor. Then
go to Step 6.
STEP 6. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 23
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0117 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-194
DTC P0118: Engine Coolant Temperature Circuit High Input
.
AK603948
1 2
1 2
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
WHITE
WHITE-BLA
CK
ENGINE
CONTROL
MODULE
ENGINE COOLANT
TEMPERATURE SENSOR
B-08
(MU802406)
B-09
ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT
2
27
1
26
AD
5 V
AK704246AB
Engine coolant
temperature sensor
Connector: B-08
B-08 (B)
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-195
CIRCUIT OPERATION
• 5-volt voltage is applied to the engine coolant
temperature sensor output terminal (terminal No.
1) from the ECM (terminal No. 26) via the resistor
in the ECM. The ground terminal (terminal No. 2)
is grounded with ECM (terminal No. 27).
• The engine coolant temperature sensor is a neg-
ative temperature coefficient type of resistor. It
has the characteristic that when the engine cool-
ant temperature rises the resistance decreases.
• The engine coolant temperature sensor output
voltage increases when the resistance increases
and decreases when the resistance decreases.
.
TECHNICAL DESCRIPTION
• The engine coolant temperature sensor converts
the engine coolant temperature to a voltage and
outputs it.
• The ECM checks whether this voltage is within a
specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Engine coolant temperature sensor output voltage is
out of specified range.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-196
DTC SET CONDITIONS
Logic Flow Chart
.
Check Condition
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgement Criterion
• Engine coolant temperature sensor output volt-
age has continued to be 4.6 volts or higher for 2
seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the engine coolant temperature is 80
° C.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function−OBD-II Drive
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Engine coolant temperature sensor failed.
• Open engine coolant temperature sensor circuit,
or connector damage.
• ECM failed.
Output voltage > 4.6V
Output voltage < 0.1V
End
No
No
No
Malfunction
Good
No
AK604317
Start
Yes
Yes
Yes
Yes
Continuous
failure for 2secs
Monitoring
conditions
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