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
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
AK303813
YELLO
W
-GREEN
BLA
CK
ENGINE COOLANT
TEMPERATURE SENSOR
POWERTRAIN CONTROL MODULE (PCM)
5 V
93
2
B-104
(MU802406)
69
1
Engine Coolant Temperature Sensor Circuit
B-21
B-22
AK303814
ENGINE
COOLANT
TEMPERATURE
SENSOR
AB
CONNECTOR: B-104
B-104 (B)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
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
.
START
END
YES
NO
NO
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
NO
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
NO : Go to Step 2.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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