Mitsubishi Outlander XL. Manual — part 241

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
negative temperature coefficient type of resistor. It
has the characteristic that when the engine coolant
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 voltage 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

｠

Engine coolant temperature sensor

｠

Intake air temperature sensor

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-159

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC SET CONDITIONS

Logic Flow Chart

Start

End

Yes

No

No

Yes

Malfunction

Good

300secs have passed?

|dt| < 1degC

Monito ring 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

No

ZK603694 AA00

Check Conditions

｠

Engine coolant temperature was 7°C (45°F) or
more when the engine started.

Judgement Criterion

｠

Engine coolant temperature fluctuates within 1°C
(1.8°F) after 5 minutes have passed since the
engine was started.

｠

However, time is not counted if any of the following
conditions are met.

1.

Intake air temperature is 60°C (140°F) or
more.

2.

Mass airflow sensor output is 13 g/sec or less.

3.

During fuel shut-off operation.

13Ab-160

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 9 P.13Ab-8.

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.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting 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 the engine coolant temperature sensor.

(1)

Disconnect the engine coolant temperature sensor
connector B-09.

(2)

Remove the engine coolant temperature sensor.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-161

DIAGNOSTIC TROUBLE CODE PROCEDURES

ZK603214AA00

(3)

With the temperature sensing portion of engine coolant
temperature sensor immersed in hot water, measure
resistance.

Standard value:

14 - 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)]

ZK603215AA00

(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.
13Ab-8.

(2)

Check the diagnostic trouble code (DTC).

Q:Is DTC P0116 set?

YES:

Replace the ECM. When the ECM is replaced, register

the ID code. Refer to GROUP 42B, ID Code Registration
Judgment Table <Vehicles with KOS> P.42B-12or GROUP
42C, ID Code Registration Judgment Table <Vehicles with
WCM> P.42C-8.

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.

13Ab-162

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

DIAGNOSTIC TROUBLE CODE PROCEDURES