Mitsubishi Galant. Manual — part 213

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-77

STEP 9. Check the engine coolant temperature sensor.
(1) Disconnect the engine coolant temperature sensor

connector B-13.

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

temperature sensor immersed in hot water, check
resistance.

Standard value:

5.3

−−−−

6.7 k

Ω

Ω

Ω

Ω

[at 0C

°°°°

(32

°°°°

F)]

2.3

−−−−

3.0 k

Ω

Ω

Ω

Ω

[at 20C

°°°°

(68

°°°°

F)]

1.0

−−−−

1.5 k

Ω

Ω

Ω

Ω

[at 40C

°°°°

(104

°°°°

F)]

0.30

−−−−

0.42 k

Ω

Ω

Ω

Ω

[at 80C

°°°°

(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 resistance at the standard value?

YES : Go to Step 10.
NO : Replace the engine coolant temperature sensor. Then

go to Step 11.

STEP 10. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?

YES : Replace the PCM. Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 11.

ACX02490

CONNECTOR:B-13

ENGINE
COOLANT
TEMPERATURE
SENSOR

AG

AKX01622

AKX01623 AB

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-78

STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to

P.13B-4

, Procedure 6

−

Other Monitor.

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0116 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

DTC P0117: Engine Coolant Temperature Circuit Low Input

AK000499

1 2

BLA

CK

YELLO

W

-GREEN

57

44

POWERTRAIN CONTROL
MODULE(PCM)

ENGINE COOLANT
TEMPERATURE SENSOR

B-13
(MU802406)

2

1

5V

C-40
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-79

CIRCUIT OPERATION

•

5-volt voltage is applied to the engine coolant
temperature sensor output terminal (terminal 1)
from the PCM (terminal 44) via the resistor in
the PCM. The ground terminal (terminal 2) is
grounded with PCM (terminal 57).

•

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 resistor decreases.

•

The engine coolant temperature sensor output
voltage increases when the resistor increases
and decreases when the resistor decreases.

TECHNICAL DESCRIPTION

•

The engine coolant temperature sensor converts
the engine coolant temperature to a voltage and
output it.

•

The PCM checks whether this voltage is within a
specified range.

DTC SET CONDITIONS

Check Conditions, Judgement Criteria

•

Engine coolant temperature sensor output
voltage increased from a value lower than 1.6
volts to a value higher than 1.6 volts [coolant
temperature decreases from a higher than 40

°

C

(104

°

F) temperature to a lower than 40

°

C (104

°

F) temperature].

•

Then the engine coolant temperature sensor
output voltage has continued to be 1.6 volts or
higher for five minutes.

Check Conditions, Judgement Criteria

•

About 60

−

300 seconds have passed for the

engine coolant temperature to rise to about 7

°

C

(44.6

°

F) after starting sequence was completed.

•

However, time is not counted when volume air
flow sensor average output frequency is 70Hz or
less, or fuel is shut off.

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

•

Engine coolant temperature sensor failed.

•

Open or shorted engine coolant temperature
sensor circuit, or loose connector.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

ACX02490

CONNECTOR:B-13

ENGINE
COOLANT
TEMPERATURE
SENSOR

AG

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-80

STEP 1. Using scan tool MB991502, check data list item 21:
Engine Coolant Temperature Sensor.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

21, 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(

P.00-8

).

NO : Go to Step 2.

STEP 2. Check the sensor output voltage at engine coolant
temperature sensor connector B-13 by backprobing.
(1) Do not disconnect the connector B-13.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 and ground by

backprobing.

•

When engine coolant temperature is 0

°

C(32

°

F),

voltage should be 3.2 and 3.8 volts.

•

When engine coolant temperature is 20

°

C(68

°

F),

voltage should be 2.3 and 2.9 volts.

•

When engine coolant temperature is 40

°

C(104

°

F),

voltage should be 1.3 and 1.9 volts.

•

When engine coolant temperature is 80

°

C(176

°

F),

voltage should be 0.3 and 0.9 volts.

(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the voltage normal?

YES : Go to Step 3.
NO : Go to Step 5.

STEP 3. Check connector B-13 at the engine coolant
temperature sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 14.

AC003081 AB

16 PIN

MB991502

AK000233

B-13 CONNECTOR
HARNESS SIDE VIEW

1 2

AD

ACX02490

CONNECTOR:B-13

ENGINE
COOLANT
TEMPERATURE
SENSOR

AG