Mitsubishi Galant (2004+). Manual — part 1173
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-385
.
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 (terminal
No. 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
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
• 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)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-386
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgment Criteria
• Left bank heated oxygen sensor (rear) output
voltage has continued to be 1.2 volts or higher for
2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Short circuit in left bank heated oxygen sensor
(rear) output line.
• Connector damage.
• PCM failed.
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
2secs HAVE PASSED?
OUTPUT VOLTAGE > 1.2V
NO
YES
MONITORING
CONDITIONS
AK302396
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-387
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Check harness connector B-24 at left bank heated
oxygen sensor (rear) and harness connector B-22 at PCM
for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 3.
1
2
3
4
AK303079
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
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-388
STEP 2. Check for short circuit to power supply between
left bank heated oxygen sensor (rear) connector B-24
(terminal No. 4) and PCM connector B-22 (terminal No. 96).
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.
1
2
3
4
AK303079
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-24
AB
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
B-24 (GR)
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
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