Mitsubishi Galant. Manual — part 112
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-129
STEP 1. Using scan tool MB991502, check data list item 59:
Heated Oxygen Sensor (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
59, Heated Oxygen Sensor (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 heated oxygen
sensor (rear) connector C-19 by backprobing.
(1) Do not disconnect the connector C-19.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 3 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 73 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
AK000291
C-19 CONNECTOR
HARNESS SIDE VIEW
1
2
3 4 5 6
AC
AK000293
C-41 CONNECTOR
HARNESS SIDE VIEW
71
78
90
72
79
73
80
91
74
81
75
87
92
76
88
97
77
89
98
82
93
83 84
94
85
95
86
96
AC
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-130
STEP 4. Check connector C-19 at 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 59:
Heated Oxygen Sensor (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
59, Heated Oxygen Sensor (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.
AK000558AB
CONNECTOR:C-19
AK000280
CONNECTOR : C-41
PCM
AY
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-131
STEP 6. Check connector C-19 at heated oxygen sensor
(rear) and connector C-41 at PCM for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between heated oxygen sensor
(rear) connector C-19 terminal 3 and PCM connector
C-41 terminal 73 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 C-19 at 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.
STEP 8. Check the continuity at heated oxygen sensor
(rear) harness side connector C-19.
(1) Disconnect the connector C-19 and measure at the harness
side.
(2) Check for the continuity between terminal 4 and ground.
•
Should be less than 2 ohm.
Q: Is the continuity normal?
YES : Go to Step 11.
NO : Go to Step 9.
AK000558AB
CONNECTOR:C-19
AK000280
CONNECTOR : C-41
PCM
AY
AK000558AB
CONNECTOR:C-19
AK000321
C-19 HARNESS SIDE
CONNECTOR
1
2
3
6
4
5
AC
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-132
STEP 9. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 15.
STEP 10. Check for open circuit and harness damage
between heated oxygen sensor (rear) connector C-19
terminal 4 and PCM connector C-40 terminal 57.
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 15.
NO : Repair it. Then go to Step 15.
STEP 11. Check connector C-41 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 15.
AK000280
CONNECTOR : C-40
PCM
AV
AK000558AB
CONNECTOR:C-19
AK000280
CONNECTOR : C-40
PCM
AV
AK000280
CONNECTOR : C-41
PCM
AY
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