Mitsubishi Outlander GS45X. Manual - part 812

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-181

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 resistor 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

does not change for specified period when
engine coolant temperature sensor output volt-
age at engine start is over 7

°C (45°F).

MONITOR EXECUTION

Once per driving cycle

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)

• Mass airflow sensor

• Intake air temperature sensor

AK700408

Engine coolant
temperature sensor

Exhaust gas
recirculation valve

B-09 (B)

Connector: B-09

AK700401AB

ECM

B-10 (GR)

Connector: B-10

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-182

DTC SET CONDITIONS

Logic Flow Chart

Start

End

Yes

Malfunction

Good

Ta >= 300secs

Td >= 30secs

|dT| < 1˚C (1.8˚F)

Monitoring conditions?

Start measuring the minimum and maximum

temperature from engine start

Calculate the difference of the minimum and

the maximum temperature from engine start; dT

Yes

AK800937

Accumulate time in acceleration; Ta

Accumulate time in deceleration; Td

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-183

Check Conditions

• Engine coolant temperature was more than 7°C

(45

°F) when the engine started.

• The accumulation is more than 300 seconds dur-

ing the acceleration having the mass airflow rate
of 12 g/sec or more.

• The accumulation is more than 30 seconds dur-

ing the deceleration having the mass airflow rate
of 9 g/sec or less.

Judgement Criterion

• Engine coolant temperature fluctuates within 1°C

(1.8

°F) after 330 seconds have passed since the

engine was started.

• However, time is not counted if any of the follow-

ing conditions are met.

1. Intake air temperature is 60

°C (140°F) or

more.

2. During fuel shut-off operation.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Pattern 9

P.13B-11

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

• Engine coolant temperature sensor failed.

• ECM failed.

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.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-184

STEP 2. Check the engine coolant temperature sensor.
(1) Disconnect the engine coolant temperature sensor

connector B-09.

(2) Remove the engine coolant temperature sensor.
(3) With the temperature sensing portion of engine coolant

temperature sensor immersed in hot water, measure
resistance.

Standard value:

− 17 kΩ [at −20°C (−4°F)]

5.1

− 6.5 kΩ [at 0°C (32°F)]

2.1

− 2.7 kΩ [at 20°C (68°F)]

0.9

− 1.3 kΩ [at 40°C (104°F)]

0.48

− 0.68 kΩ [at 60°C (140°F)]

0.26

− 0.36 kΩ [at 80°C (176°F)]

(4) Apply 3M

™ AAD part number 8731 or equivalent on the

screw section of the engine coolant temperature sensor.

(5) Install the engine coolant temperature sensor, and tighten

to the specified torque.

Tightening torque: 29

± 10 N⋅m (22 ± 7 ft-lb)

Q: Is the measured resistance normal?

YES : Replace the engine coolant temperature sensor. Then

go to Step 3.

NO : Go to Step 3.

STEP 3. 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 9

P.13B-11

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0116 set?

YES : Replace the ECM. When the ECM is replaced,

with KOS>

P.42B-15

or GROUP 42C, Diagnosis

− ID

Codes Registration Judgment Table <Vehicles with
WCM>

P.42C-10

NO : 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

AK700231

AK700232 AB

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