Mitsubishi Evolution X. Manual - part 299

 

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Mitsubishi Evolution X. Manual - part 299

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-173

STEP 5. Check the engine coolant temperature sensor.
Refer to Engine Coolant Temperature Sensor Check 

P.13A-907

.

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> 

P.42B-12

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

. 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 

P.13A-9

.

(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-174

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-175

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-176

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 

Cycle

−Pattern 23 

P.13A-9

.

.

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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