Mitsubishi Lancer Evolution X. Manual — part 259
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-101
STEP 10. Check for harness damage between heated
oxygen sensor (rear) connector D-35 (terminal No. 2) and
ECM connector B-09 (terminal No. 35).
NOTE: Check harness after checking intermediate connectors
A-13 and C-45. If intermediate connectors are damaged, repair
or replace them. Refer to GROUP 00E, Harness Connector
Inspection
Q: Is the harness wire in good condition?
YES : Go to Step 11.
NO : Repair it. Then go to Step 12.
STEP 11. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 2
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0037 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>
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 12. 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 2
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0037 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-102
DTC P0038: Heated Oxygen Sensor (rear) Heater Circuit High
AK704230
1
3
2
4
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
1 2
3 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
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
1
2
3 4 5 6
WHITE
WHITE
HEATED OXYGEN SENSOR (REAR) HEATER CIRCUIT
36
FUSIBLE LINK
AB
D-35
4
1
20A
WHITE
A-34X
4
3
1
2
22
C-47
B-09
OFF
ON
C-43
1
4
2
3
RED-
GREEN
RED-
GREEN
11
10
2
C-45
A-13
35
J/C(4)
HEATED OXYGEN SENSOR
(REAR)
RELAY BOX
(ENGINE COMPARTMENT)
BR
O
WN
BR
O
WN
ENGINE
CONTROL
MODULE
TO ECM
TO ECM
TO ECM
MFI
RELAY
BR
O
WN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-103
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 2) to the heated oxygen sensor (rear) heater.
• The ECM (terminal No. 35) controls continuity to
the heated oxygen sensor (rear) 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.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor heater (rear) current 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
AK704231
Connectors: C-43, C-45 and C-47
C-47
C-45
C-43 (B)
AB
AK704232
Heated oxygen
sensor (rear)
Connector: D-35
D-35 (B)
AB
Rear heater
duct
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-104
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 (rear) heater is
on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The heated oxygen sensor (rear) heater current
has continued to be higher than 10.5 ampere for
2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 2
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Heated oxygen sensor (rear) failed.
• ECM failed.
End
No
No
Malfunction
Good
Current < 0.17A
or
Current > 10.5A
Voltage < 2.0V
AK900352
Heater activation
command ON
No
No
Start
Yes
Yes
Yes
Yes
Yes
No
Continuous
failure for 2secs
Monitoring
conditions
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