Mitsubishi Eclipse. Manual — part 402

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-151

DTC P0118: Engine Coolant Temperature Circuit High Input

AK000688

1 2

BL

ACK

YELL

O

W

-GREEN

49 <M/T>
57 <A/T>

44

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

ENGINE COOLANT
TEMPERATURE SENSOR

B-11
(MU802406)

2

1

5V

65

43
50

42
49

41
48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

C-58 <M/T>
(MU803782)

C-55 <A/T>
(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

Engine Coolant Temperature Sensor Circuit

AK300081

CONNECTOR: B-11

ENGINE
COOLANT
TEMPERATURE
SENSOR

AB

B-11 (B)

AK300091

CONNECTOR: C-58 <M/T>

ECM

AC

C-58 (GR)

AK300244

CONNECTOR: C-55 <A/T>

AG

PCM

C-55 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-152

.

CIRCUIT OPERATION

• 5-volt voltage is applied to the engine coolant

temperature sensor output terminal (terminal No.
1) from the ECM (terminal No. 44) <M/T> or PCM
(terminal No. 44) <A/T> via the resistor in the
ECM <M/T> or PCM <A/T>. The ground terminal
(terminal No. 2) is grounded with ECM (terminal
No. 49) <M/T> or (terminal No. 57) <A/T>.

• 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 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 ECM <M/T> or PCM <A/T> 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)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-153

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the staring

sequence was completed.

Judgement Criteria

• Engine coolant temperature sensor output volt-

age has continued to be 4.6 volts or higher [cor-
responding to a coolant temperature of

−45°C

(

−113°F) or lower] for 2 seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function

−OBD-ll Drive

Cycle

−Procedure 6−Other Monitor

P.13B-7

.

.

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

• Engine coolant temperature sensor failed.

• Open engine coolant temperature sensor circuit

connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

START

OUTPUT VOLTAGE > 4.6V

OUTPUT VOLTAGE < 0.1V

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2secs

MONITORING

CONDITIONS?

NO

YES

AK301426

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-154

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 21:
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

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.00-6

.

NO : Go to Step 2.

STEP 2. Check connector B-11 at the engine coolant
temperature sensor for damage.
Q: Is the 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 11.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

AK300435

1

2

CONNECTOR: B-11

AB

B-11 (B)

HARNESS CONNECTOR:
COMPONENT SIDE