Mitsubishi Galant. Manual — part 227
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-133
CIRCUIT OPERATION
•
A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the
PCM (terminal 74) from the output terminal
(terminal 4) of the right bank heated oxygen
sensor (rear).
•
Terminal 2 of the right bank heated oxygen
sensor (rear) is grounded with PCM (terminal 57).
TECHNICAL DESCRIPTION
•
The output signal of the right bank heated oxygen
sensor (front) is compensated by the output
signal 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.
DTC SET CONDITIONS
Check Conditions
•
Right bank heated oxygen sensor (rear) signal
voltage has continued to be 0.15 volt or lower for
three minutes or more after the starting sequence
was completed.
•
Engine coolant temperature is higher than 82
°
C
(180
°
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.
•
Only one monitor during one drive cycle
Check Conditions
•
Right bank heated oxygen sensor (rear) signal
voltage has continued to be 0.15 volt or lower for
three minutes or more after the starting sequence
was completed.
•
Engine coolant temperature is higher than 82
°
C
(180
°
F).
•
Engine speed is higher than 1,200 r/min.
•
Volumetric efficiency is higher than 25 percent.
•
Volume air flow sensor output frequency is 100
Hz or more.
•
At least twenty seconds have passed since fuel
shut off control was canceled.
•
The right bank heated oxygen sensor (front)
outputs 0.5 volts or more.
•
Monitoring time: 10 seconds
Judgement Criteria
•
Making the air/fuel ratio 15 percent for 10
seconds richer does not result in raising the right
bank heated oxygen sensor (rear) output voltage
beyond 0.15 volt.
•
Only one monitor during one drive cycle
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Right bank heated oxygen sensor (rear) failed.
•
Open circuit in right bank heated oxygen sensor
(rear) output line.
•
Open circuit in right bank heated oxygen sensor
(rear) ground line.
•
PCM failed.
DIAGNOSIS
Required Special Tools
MB991502: Scan Tool (MUT-II)
MB991316: Test Harness
ACX02493AG
CONNECTOR:B-31
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AK000280
CONNECTORS : C-40, C-41
C-41
C-40
PCM
AX
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-134
STEP 1. Using scan tool MB991502, check data list item 69:
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
69, Heated Oxygen Sensor Bank 1, Sensor 2 (right 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.
STEP 2. Check the sensor output voltage at right bank
heated oxygen sensor (rear) connector B-31 by
backprobing.
(1) Do not disconnect the connector B-31.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 4 and ground by
backprobing.
•
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 voltage normal?
YES : Go to Step 3.
NO : Go to Step 7.
STEP 3. Check the sensor output voltage at PCM
connector C-41 by backprobing.
(1) Do not disconnect the connector C-41.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 74 and ground by
backprobing.
•
Warming up the engine. When the engine is 2,500 r/min,
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 voltage normal?
YES : Go to Step 4.
NO : Go to Step 6.
AC003081 AB
16 PIN
MB991502
AKX01538
B-31 CONNECTOR
HARNESS SIDE VIEW
2
4
1
3
AG
AKX01536
717273 74
78 7980 818283 8485 86 87 88 89
75 76 77
98
97
96
95
94
93
92
91
90
C-41 CONNECTOR
HARNESS SIDE VIEW
AE
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-135
STEP 4. Check connector B-31 at right bank heated
oxygen sensor (rear) and connector C-41 at PCM for
damage.
Q: Is the connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 15.
STEP 5. Using scan tool MB991502, check data list item 69:
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
69, Heated Oxygen Sensor Bank 1, Sensor 2 (right 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 : Replace the PCM. Then go to Step 15.
AK000617
CONNECTOR:B-31
AC
AK000280
CONNECTOR : C-41
PCM
AY
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-136
STEP 6. Check connector B-31 at right bank heated
oxygen sensor (rear) and connector C-41 at PCM for
damage.
Q: Is the connector in good condition?
YES : Repair harness wire between right bank heated
oxygen sensor (rear) connector B-31 terminal 4 and
PCM connector C-41 terminal 74 because of open
circuit or harness damage. Then go to Step 15.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 15.
STEP 7. Check connector B-31 at right bank heated
oxygen sensor (rear) for damage.
Q: Is the connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection(
). Then go to Step 15.
AK000617
CONNECTOR:B-31
AC
AK000280
CONNECTOR : C-41
PCM
AY
AK000617
CONNECTOR:B-31
AC
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