Mitsubishi Galant. Manual — part 110
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-121
CIRCUIT OPERATION
•
Power is supplied from the MFI relay (terminal 1)
to the heated oxygen sensor (front) heater.
•
The PCM (terminal 3) controls continuity to the
heated oxygen sensor (front) heater by turning
the power transistor in the PCM "ON" and
"OFF."
TECHNICAL DESCRIPTION
•
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 (front) heater is
on.
•
Battery positive voltage is at between 11 and 16
volts.
Judgment Criteria
•
Heater current of the heated oxygen sensor
(front) heater has continued to be lower than 0.2
ampere or higher than 3.5 ampere for 6 seconds.
•
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 (front)
heater circuit.
•
Open circuit in heated oxygen sensor (front)
heater.
•
PCM failed.
DIAGNOSIS
Required Special Tools
MD998464: Test Harness
ACX02476
CONNECTOR : B-15
AF
HEATED OXYGEN
SENSOR (FRONT)
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-122
STEP 1. Check connector B-15 at the heated oxygen
sensor (front) 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 (front).
(1) Disconnect heated oxygen sensor (front) connector B-15
and connect test harness special tool, MD998464, to the
connector on the heated oxygen (front) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal 1 (red clip) and terminal 3 (blue clip).
Standard value: 4.5
−−−−
8.0 ohm [at 20
°°°°
C (68
°°°°
F)]
Q: Is the resistance normal?
YES : Go to Step 3.
NO : Replace the heated oxygen sensor (front). Then go to
Step 12.
STEP 3. Check the power supply voltage at heated oxygen
sensor (front) harness side connector B-15.
(1) Disconnect the connector B-15 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 1 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.
AK000556 AB
CONNECTOR:B-15
ACX02476
CONNECTOR : B-15
AF
HEATED OXYGEN
SENSOR (FRONT)
AKX01624
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
MD998464
BLUE
RED
AC
AKX01498
B-15 HARNESS SIDE
CONNECTOR
1
2
3
4
AK
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-123
STEP 4. Check connector A-21X at the MFI relay for
damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector A-
21X terminal 1 and heated oxygen sensor (front)
connector B-15 terminal 1 because of open circuit or
short circuit to ground Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 12.
STEP 5. Check the power supply voltage at PCM connector
C-39 by backprobing.
(1) Do not disconnect the connector C-39.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and ground by
backprobing.
•
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 8.
NO : Go to Step 6.
STEP 6. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 12.
AK000555AB
CONNECTOR : A-21X
MFI RELAY
AK000290
C-39 CONNECTOR
HARNESS SIDE VIEW
1
9
24
2
10 11
25
3
12
26
4
13
27
5
19
32
6
20 21
33
7
22
34
8
23
35
14
28
15 16
29
17
30
18
31
AC
AK000280
CONNECTOR : C-39
PCM
AW
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-124
STEP 7. Check for open circuit or short circuit to ground
between heated oxygen sensor (front) connector B-15
terminal 3 and PCM connector C-39 terminal 3.
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.
STEP 8. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 12.
AK000556 AB
CONNECTOR:B-15
AK000280
CONNECTOR : C-39
PCM
AW
AK000280
CONNECTOR : C-39
PCM
AW
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