Mitsubishi Montero Sport (2004+). Manual — part 179
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-129
.
CIRCUIT OPERATION
• 5-volt voltage is applied to the engine coolant
temperature sensor output terminal (terminal No.
1) from the PCM (terminal No. 44) via the resistor
in the PCM. The ground terminal (terminal No. 2)
is grounded with (terminal No. 57).
• 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 PCM 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)
• Not applicable
.
AK103912AB
CONNECTOR: C-71
C-71
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-130
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 coolant temperature of
−45°C
(
−49°F) or lower] for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
−OBD-II Drive
Cycle
−Procedure 6−Other Monitor
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Engine coolant temperature sensor failed.
• Open engine coolant temperature sensor circuit,
or connector damage.
• PCM failed.
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)
13A-131
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• 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
NO : Go to Step 2.
STEP 2. Check connector A-67 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
. Then go to Step 11.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK104023
1
2
A-67(B)
AB
CONNECTOR: A-67
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-132
STEP 3. Measure the sensor supply voltage at engine
coolant temperature sensor harness side connector A-67.
(1) Disconnect the connector A-67 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 7.
NO : Go to Step 4.
STEP 4. Measure the sensor supply voltage at PCM
connector C-90 by backprobing.
(1) Do not disconnect the PCM connector C-90.
(2) Disconnect the engine coolant temperature sensor
connector C-90.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal No. 44 and ground
by backprobing.
• Voltage should be between 4.5 and 4.9 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 5.
NO : Go to Step 6.
AK104023
1
2
A-67(B)
AB
CONNECTOR: A-67
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000234
A-67 HARNESS
CONNECTOR:
COMPONENT SIDE
2 1
AO
AK103762
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
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01527
AKX01527
545556
46
45
44
58 59
60616263
646566
47
41 42 43
48 4950
57
515253
AKX01527AD
C-90 HARNESS
CONNECTOR:
HARNESS SIDE
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