Mitsubishi Galant 9G. Manual — part 996
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-284
STEP 2. Check for short circuit to power supply between
right bank heated oxygen sensor (rear) connector B-08
(terminal No. 4) and PCM connector B-22 (terminal No. 97).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 3.
NO : Repair it. Then go to Step 3.
AK303064
1
2
3
4
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-08
B-08 (GR)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-285
STEP 3. 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 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0138 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0139: Heated Oxygen Sensor Circuit Slow Response (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-286
.
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) output volt-
age does not change during specified go/stop
operations including fuel cut are repeated.
.
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-287
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 76°C
(169
°F).
• The right bank heated oxygen sensor (front) is
active.
• The cumulative mass airflow sensor output is
higher than 1638 g.
• Repeat 3 or more times: drive
*1
, stop
*2
.
Drive
*1
:
• Engine speed is higher than 1,500 r/min.
• Volumetric efficiency is higher than 40 per-
cent.
• Vehicle speed is higher than 30 km/h (19
mph).
• A total of more than 10 seconds have
elapsed with the above mentioned condi-
tions, and more than 2 seconds have
elapsed with the fuel shut off.
Stop
*2
:
• Vehicle speed is lower than 1.5 km/h (1.0
mph).
Judgement Criteria
• Change in the output voltage of the right bank
heated oxygen sensor (rear) is lower than 0.313
volt.
NOTE: Monitoring stops after fuel has been shut
off for more than 41 seconds.
.
END
YES
NO
NO
NO
START
MONITORING
CONDITION
YES
MALFUNCTION
GOOD
OUTPUT VOLTAGE
CHANGE < 0.313 V
GO/STOP OPERATION
FOR SPECIFIED TIMES
YES
AK302399
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