Mitsubishi Lancer Evolution X. Manual — part 295
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-245
STEP 11. Check the fuel pressure.
Refer to On-vehicle Service − Fuel Pressure Test
.
Q: Is the fuel pressure normal?
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 : Repair it. Then go to Step 12.
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 11
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0134 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-246
DTC P0137: Heated Oxygen Sensor (rear) Circuit Low Voltage
AK704250
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
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 5 6
AB
D-35
FROM MFI RELAY
TO ECM
1
4
2
3
HEATED OXYGEN SENSOR (REAR) CIRCUIT
HEATED OXYGEN
SENSOR (REAR)
B-09
YELLO
W
ORANGE
ORANGE
YELLO
W
ENGINE
CONTROL
MODULE
0.5 V
C-45
3
41
40
2
ORANGE
YELLO
W
6
5
A-13
AK704229AB
Connector: A-13
A-13
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704251
Connector: C-45
C-45
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-247
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 40) from the output terminal (terminal
No. 3) of the heated oxygen sensor (rear).
• Terminal No. 4 of the heated oxygen sensor
(rear) is grounded with ECM (terminal No. 41).
• The ECM applies an offset voltage of 0.5 volt to
terminal No. 4 of the heated oxygen sensor
(rear).
.
TECHNICAL DESCRIPTION
• The output signal of the heated oxygen sensor
(front) is compensated by the output signal of the
heated oxygen sensor (rear).
• The ECM checks for the heated oxygen sensor
(rear) output voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (rear) output voltage is under
the 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)
• Heated oxygen sensor (front) monitor
• Heated oxygen sensor (front) heater monitor
• Heated oxygen sensor (rear) heater monitor
• Heated oxygen sensor (front) inactive monitor
• Heated oxygen sensor offset voltage monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
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-248
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Heated oxygen sensor offset voltage is between
0.4 and 0.6 volt.
• Battery positive voltage is between 11 and 16.5
volts.
• More than 330 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Heated oxygen sensor (rear) output voltage is
lower than 0.2 volt for 2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 22
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Heated oxygen sensor (rear) failed.
• Open or shorted circuit in heated oxygen sensor
(rear) output line or harness damage.
• Open circuit in heated oxygen sensor (rear)
ground line or harness damage.
• Connector damage.
• ECM failed.
End
Malfunction
No
No
No
2secs have passed?
Output voltage
< 0.2V
Good
AK604321
Start
Yes
Yes
Yes
Monitoring
conditions
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