Mitsubishi Galant (2004+). Manual — part 1139
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-249
STEP 11. Check the trouble symptoms.
(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 P0135 set?
YES : Replace the PCM. Then go to Step 12.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
STEP 12. 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 P0135 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-250
DTC P0136: Heated Oxygen Sensor Circuit (bank 1, sensor 2)
YELLO
W
BLUE
BLA
CK
BLA
CK
AK302842
TO PCM
FROM MFI RELAY
69
97
2
4
3
1
B-22
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
POWERTRAIN CONTROL
MODULE (PCM)
4
3
1 2
B-08
MU802665
Right Bank Heated Oxygen Sensor (rear) Circuit
B-21
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-251
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 97) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(rear).
• Terminal No. 2 of the right bank heated oxygen
sensor (rear) is grounded with PCM (terminal No.
69).
.
TECHNICAL DESCRIPTION
• The output signal of the right bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).
• The PCM checks for an open circuit in the right
bank heated oxygen sensor (rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (rear) circuit is
switched to 5 volts intentionally when oxygen
sensor output is low, and detects the malfunction
if the output voltage changes to equal or greater
than 4.5 volts. 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
.
AK303063
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-08
B-08 (GR)
AB
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) <3.8L ENGINE>
13B-252
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 3 minutes or more have passed since the engine
starting sequence was completed.
• Right 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.
• Monitoring time: 7 seconds.
Judgment Criteria
• Input voltage supplied to the PCM interface circuit
is higher than 4.5 volts when 5 volts is applied to
the right bank heated oxygen sensor (rear) output
line via a resistor.
.
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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