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