Mitsubishi Galant (2004+). Manual — part 1171
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-377
STEP 15. Test 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 P0156 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0157: Heated Oxygen Sensor Circuit Low Voltag (bank 2, sensor 2)
GREEN
BLUE
BLA
CK
AK302846
TO PCM
FROM MFI RELAY
69
96
2
4
3
1
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
POWERTRAIN CONTROL
MODULE (PCM)
B-24
MU802665
B-22
Left Bank Heated Oxygen Sensor (rear) Circuit
B-21
1
2
3
4
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
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-378
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 96) from the output terminal
(terminalNo. 4) of the left bank heated oxygen
sensor (rear).
• Terminal No. 2 of the left bank heated oxygen
sensor (rear) is grounded with PCM (terminal No.
69).
.
TECHNICAL DESCRIPTION
• The output signal of the left bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the left bank heated oxygen sensor (rear).
• The PCM checks for an open circuit in the left
bank heated oxygen sensor (rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (rear) output voltage
stays low when air/fuel ratio is forced to be rich.
The above procedure is repeated when oxygen
sensor is inactive.
.
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)
• Heated oxygen sensor heater (front) monitor
• Heated oxygen sensor heater (rear) monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK303079
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-379
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 3 minutes or more have passed since the engine
starting sequence was completed.
• Left bank heated oxygen sensor (rear) signal
voltage has continued to be 0.15 volt or lower.
• Engine coolant temperature is higher than 76°C
(169
°F).
• Engine speed is higher than 1,200 r/min.
• Volumetric efficiency is higher than 25 percent.
• Mass airflow sensor output is 8 g/sec or more.
• At least 20 seconds have passed since fuel shut
off control was canceled.
• Monitoring time: 10 seconds.
START
V
F
> =4.5V
2secs HAS PASSED
YES
YES
YES
NO
NO
NO
MALFUNCTION
MONITORING
CONDITIONS
YES
NO
MONITORING
CONDITIONS
+5V ON
AK302398
V
F
< 0.15V
10secs HAS PASSED
YES
YES
NO
NO
END
MALFUNCTION
GOOD
MODULATE A/F CONDITION TO RICH
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-380
Judgement Criteria
• Making the air/fuel ratio 15 percent for 10 sec-
onds richer does not result in raising the left bank
heated oxygen sensor (rear) output voltage
beyond 0.15 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 (rear) failed.
• Short circuit in left bank heated oxygen sensor
(rear) output line.
• 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
• MB991316: Test Harness
STEP 1. Using scan tool MB991958, check data list item 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left bank).
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
59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
• Warming up the engine. When the engine is revved, the
output voltage should repeat 0 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.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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