Mitsubishi Evolution X. Manual — part 272
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-65
STEP 2. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 20
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0017 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 4.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
− How to Cope with
Intermittent Malfunctions
.
STEP 3. Check timing mark on the timing chain.
Q: Is timing chain in out of place?
YES : Repair it. Then go to Step 4.
NO : Check the following items, and repair or replace the
defective items.
a. Check the timing chain loose.
b. Check the exhaust variable valve timing
sprocket tooth coming off.
Then go to Step 4.
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 20
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0017 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-66
DTC P0031: Heated Oxygen Sensor (front) Heater Circuit Low
AK704225
1
3
2
4
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
1 2
3 4
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
HEATED OXYGEN SENSOR (FRONT) HEATER CIRCUIT
20A
WHITE
BLUE-BLA
CK
WHITE
WHITE
A-34X
MFI
RELAY
RELAY BOX
(ENGINE COMPARTMENT)
4
3
1
2
22
TO ECM
HEATED OXYGEN SENSOR
(FRONT)
1
4
2
3
TO ECM
TO ECM
ENGINE
CONTROL
MODULE
34
C-34
B-09
A-13
36
FUSIBLE LINK
BLUE
8
OFF
ON
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-67
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 2) to the heated oxygen sensor (front) heater.
• The ECM (terminal No. 34) controls continuity to
the heated oxygen sensor (front) heater by turn-
ing the power transistor in the ECM "ON" and
"OFF".
.
TECHNICAL DESCRIPTION
• The ECM checks whether the heater current is
within a specified range when the heater is ener-
gized.
• The ECM checks whether the heater voltage is
within a specified range when the heater is not
energized.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor heater (front) current or volt-
age is out of 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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
AK704229AB
Connector: A-13
A-13
AK704226
Connector: A-34X
MFI relay
A-34X
AB
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704228
AB
Heated oxygen
sensor (front)
Connector: C-34
C-34 (B)
SRS-ECU
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-68
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the heated oxygen sensor (front) heater is
on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The heated oxygen sensor (front) heater current
has continued to be lower than 0.17 ampere for 2
seconds.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the heated oxygen sensor (front) heater is
off.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The heated oxygen sensor (front) heater voltage
has continued to be lower than 2.0 volts for 2 sec-
onds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 2
.
.
End
No
No
Malfunction
Good
Current < 0.17A
or
Current > 10.5A
Voltage < 2.0V
AK604306
Heater ON
No
No
Start
Yes
Yes
Yes
Yes
Yes
No
Continuous
failure for 2secs
Monitoring
conditions
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