Mitsubishi Galant 9G. Manual — part 1007
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-328
STEP 3. Check harness connector B-25 at left bank heated
oxygen sensor (front) and harness connector B-22 at PCM
for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 5.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
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-329
STEP 4. Check for short circuit to ground between left
bank heated oxygen sensor (front) connector B-25
(terminal No. 4) and PCM connector B-22 (terminal No. 91).
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.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
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-330
STEP 5. 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 P0151 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0152: Heated Oxygen Sensor Circuit High Voltage (bank 2, sensor 1)
BLA
CK
BLA
CK
TO PCM
FROM MFI RELAY
WHITE
AK400903
69
91
4
3
1
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
POWERTRAIN CONTROL
MODULE (PCM)
2
B-25
MU802605
B-22
Left Bank Heated Oxygen Sensor (front) 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-331
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 91) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(front).
• Terminal No. 2 of the left bank heated oxygen
sensor (front) is grounded with PCM (terminal
No. 69).
.
TECHNICAL DESCRIPTION
• The left bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and input the resulting signals to the PCM.
• When the left bank heated oxygen sensor (front)
begins to deteriorate, the heated oxygen sensor
signal response becomes poor.
• The PCM forcibly varies the air/fuel mixture to
make it leaner and richer, and checks the
response speed of the left bank heated oxygen
sensor (front). In addition, the PCM also checks
for an open circuit in the left bank heated oxygen
sensor (front) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (front) output volt-
age is over 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)
• Heated oxygen sensor heater (front) monitor
• Misfire monitor
• Fuel system monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
• Accelerator pedal position sensor
.
AK303070
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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