Mitsubishi Galant (2004+). Manual - part 828

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-129

DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem

CAUTION

If DTC P0116 has been set, TCL related DTC
U1120 is also set. After P0116 has been diag-
nosed, don't forget to erase DTC U1120.

1 2

53 54 55 56

58 59 60 61 62

64 65 66 67 68 69

71 72 73 74 75

77 78 79 80 81 82

100

93 94 95

96 97 98

101 102 103 104

105 106 107 108

109 110 111 112 113

AK303813

YELLO

-GREEN

BLA

ENGINE COOLANT
TEMPERATURE SENSOR

POWERTRAIN CONTROL MODULE (PCM)

5 V

B-104

(MU802406)

Engine Coolant Temperature Sensor Circuit

B-21

B-22

AK303814

ENGINE
COOLANT
TEMPERATURE
SENSOR

CONNECTOR: B-104

B-104 (B)

AK303013

CONNECTORS: B-21, B-22

PCM

AIR CLEANER

B-22 (B)

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-130

CIRCUIT OPERATION

• 5-volt voltage is applied to the engine coolant

temperature sensor output terminal (terminal No.
1) from the PCM (terminal No. 93) via the resistor
in the PCM. The ground terminal (terminal No. 2)
is grounded with PCM (terminal No. 69).

• 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 resistance 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 PCM 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

• Engine coolant temperature sensor

• Intake air temperature sensor

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-131

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Engine coolant temperature was 7°C (45°F) or

more when the engine started.

Judgement Criteria

• 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 follow-

ing conditions are met.

1. Intake air temperature is 60

°C (140°F) or

more.

2. Mass airflow sensor output is 6 g/sec or less.
3. During fuel shut-off operation.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

−OBD-II Drive

Cycle

−Procedure 6−Other Monitor

P.13A-5

START

END

YES

MALFUNCTION

GOOD

300secs HAVE PASSED?

|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

AK302014

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-132

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

• Engine coolant temperature sensor failed.

• Harness damage or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

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.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

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