Mitsubishi Montero (2004+). Manual — part 161
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-131
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 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
.
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
• 2 seconds or more have passed since the engine
starting sequence was completed.
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
AK302925
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-132
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,
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
• 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 B-37 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.
AK302970
AB
MB991911
MB991824
MB991827
AK200943
1
2
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-37
B-37(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-133
STEP 3. Measure the sensor supply voltage at engine
coolant temperature sensor harness side connector B-37.
(1) Disconnect the connector B-37 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 D-135 by backprobing.
(1) Do not disconnect the PCM connector D-135.
(2) Disconnect the engine coolant temperature sensor
connector B-37.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal No. 98 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.
AK200943
1
2
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-37
B-37(B)
AK000234 AL
2 1
B-37 HARNESS
CONNECTOR:
COMPONENT SIDE
AK200947
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110
111
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120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
AK201395
9192
939495
96979899
100 101102103
104
105106
107108109
110111112
113114
115116117
118119120
AB
D-135 HARNESS
CONNECTOR:
HARNESS SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-134
STEP 5. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between engine coolant
temperature sensor connector B-37 (termial No. 1)
and PCM connector D-135 (termial No. 98) because
of open circuit. Then go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
STEP 6. Check connector D-135 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
. Then go to Step 11.
AK200947
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120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
AK200947
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CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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