Mitsubishi Evolution X. Manual — part 298

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-169

DTC P0117: Engine Coolant Temperature Circuit Low 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

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MULTIPORT FUEL INJECTION (MFI)

13A-170

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

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MULTIPORT FUEL INJECTION (MFI)

13A-171

DTC SET CONDITIONS
Logic Flow Chart

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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 0.1 volt or lower 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

.

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TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)

• Engine coolant temperature sensor failed.

• Shorted engine coolant temperature sensor cir-

cuit, 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-172

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item 6:
Engine Coolant Temperature Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item

6, Engine Coolant Temperature Sensor.

• The engine coolant temperature and temperature

shown with the scan tool should approximately match.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunctions

P.00-15

.

NO : Go to Step 2.

STEP 2. Check harness connector B-08 at the engine
coolant temperature sensor for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 6.

STEP 3. Check for short circuit to ground between engine
coolant temperature sensor connector B-08 (terminal No.
1) and ECM connector B-09 (terminal No. 26).
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair it. Then go to Step 6.

STEP 4. Check harness connector B-09 at ECM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 6.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB