Mitsubishi Montero (2004+). Manual — part 200
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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• Monitoring time: 10 seconds.
Judgement Criteria
• Making the air/fuel ratio 15 percent for 10 sec-
onds richer does not result in raising the heated
oxygen sensor (front) output voltage beyond 0.2
volt.
.
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: )
• Left bank heated oxygen sensor (front) failed.
• Short circuit in left bank heated oxygen sensor
(front) output line.
• 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
• MD998464: Test Harness
STEP 1. Using scan tool MB991958, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
• Warm up the engine. When the engine is revved, the
output voltage should measure 0.6 to 1.0 volt.
• Warm up the engine. When the engine is idling, the out-
put voltage should repeat 0.4 volt and 0.6 to 1.0 volt
alternately.
(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.
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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STEP 2. Check the left bank heated oxygen sensor (front).
(1) Disconnect the left bank heated oxygen sensor (front)
connector B-26 and connect test harness special tool
MB991316 to the connector on the left bank heated oxygen
sensor (front) side.
(2) Warm up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
(3) Perform a racing for 5 minutes or more with the engine
speed of 4,500 r/min.
(4) Connect a digital voltage meter between terminal No. 2
(black clip of special tool) and terminal No. 4 (white clip of
special tool).
(5) While repeatedly revving the engine, measure the left bank
heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wire;
incorrect connection can damage the left bank heated
oxygen sensor (front).
• Be careful the heater is broken when voltage of beyond
8 volts is applied to the left bank heated oxygen sensor
(front) heater.
NOTE: If the sufficiently high temperature [of approximate
400
°
C(752
°
F) or more] is not reached although the left bank
heated oxygen sensor (front) is normal, the output voltage
would be possibly low although the rich air/fuel ratio. There-
fore, if the output voltage is low, use a jumper wire to con-
nect the terminal No. 1 (red clip of special tool) and the
terminal No. 3 (blue clip of special tool) of the left bank
heated oxygen sensor (front) with the positive terminal and
the negative terminal of 8 volts power supply respectively,
then check again.
Q: Is the voltage between 0.6 and 1.0 volt?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 5.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AC
HARNESS
CONNECTOR:
COMPONENT
SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MB991316
WHITE
BLACK
AN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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STEP 3. Check connector B-26 at left bank heated oxygen
sensor (front) and connector D-135 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 5.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AC
HARNESS
CONNECTOR:
COMPONENT
SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
AK200947
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-290
STEP 4. Check for short circuit to ground between left
bank heated oxygen sensor (front) connector B-26
(terminal No. 4) and PCM connector D-135 (terminal No.
108).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 5.
NO : Repair it. Then go to Step 5.
STEP 5. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0151 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AC
HARNESS
CONNECTOR:
COMPONENT
SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
AK200947
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92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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