Mitsubishi Galant. Manual — part 114
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-137
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).
(4) Warm up the engine.
•
After increasing the output voltage 0.15 volts or more by
the engine revving, finish it. Then confirm that the output
voltage reduces to 0.15 volts or less within 3 seconds.
(5) 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 heated oxygen sensor (rear). Then go to
Step 2.
STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,
Procedure 6
−
Other Monitor(
(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0139 is output?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AC003081 AB
16 PIN
MB991502
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-138
DTC P0141: O
2
Sensor Heater Circuit Malfunction (sensor 2)
AK000467
5 6
3 4
3 4
1 2
2
1
RED-
WHITE
RED-
WHITE
RED-
WHITE
RED
BLUE-RED
BATTERY
A-21X
MFI
RELAY
HEATED OXYGEN
SENSOR(REAR)
C-19
MU801448
TO ECM
OR PCM
TO ECM
OR PCM
1
2
3
3
4
4
5
6
POWERTRAIN CONTROL
MODULE(PCM)
26
C-39
(MU803784)
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24 25
26 27 28 29
3132 33
34 35
1
10
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-139
CIRCUIT OPERATION
•
Power is supplied from the MFI relay (terminal 1)
to the heated oxygen sensor (rear) heater.
•
The PCM (terminal 26) controls continuity to the
heated oxygen sensor (rear) heater by turning
the power transistor in the PCM "ON" and "OFF".
BACKGROUND
•
The PCM checks whether the heater current is
within a specified range when the heater is
energized.
DTC SET CONDITIONS
Check Conditions
•
Engine coolant temperature is higher than 20
°
C
(68
°
F).
•
While the heated oxygen sensor (rear) heater is
on.
•
Battery positive voltage is at between 11 and 16
volts.
Judgment Criteria
•
Heater current of the heated oxygen sensor
(rear) heater has continued to be lower than 0.2
ampere or higher than 3.5 ampere for 6 seconds.
•
Only one monitor during one drive cycle
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Open or shorted heated oxygen sensor (rear)
heater circuit.
•
Open circuit in heated oxygen sensor (rear)
heater.
•
PCM failed.
DIAGNOSIS
Required Special Tools
MB991658: Test Harness
AC002318
CONNECTOR:C-19
HEATED
OXYGEN
SENSOR
(REAR)
AC
AK000280
CONNECTOR : C-39
PCM
AW
AK000555AB
CONNECTOR : A-21X
MFI RELAY
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-140
STEP 1. Check connector C-19 at the heated oxygen
sensor (rear) for damage.
Q: Is the 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 12.
STEP 2. Check the heated oxygen sensor (rear).
(1) Disconnect heated oxygen sensor (rear) connector C-19
and connect test harness special tool, MB991658, to the
connector on the heated oxygen (rear) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal 5 and terminal 6.
Standard value: 11
−−−−
18 ohm [at 20
°°°°
C (68
°°°°
F)]
Q: Is the resistance normal?
YES : Go to Step 3.
NO : Replace the heated oxygen sensor (rear). Then go to
Step 12.
STEP 3. Check the power supply voltage at heated oxygen
sensor (rear) harness side connector C-19.
(1) Disconnect the connector C-19 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 5 and ground.
•
Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 5.
NO : Go to Step 4.
AK000558AB
CONNECTOR:C-19
AC002318
CONNECTOR:C-19
HEATED
OXYGEN
SENSOR
(REAR)
AC
AK000121AB
HEATED OXYGEN SENSOR
EQUIPMENT SIDE CONNECTOR
MB991658
AK000322
C-19 HARNESS SIDE
CONNECTOR
1
2
3
6
4
5
AC
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