Mitsubishi Lancer Evolution X. Manual — part 289
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-221
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is between − 10° C
(14° F) and 60° C (140° F) when the engine is
started.
• Intake air temperature is − 10° C (14° F) or higher.
• The intake air temperature subtracted from the
intake air temperature when the engine is started
is lower than 10° C (18° F).
• The total time when the amount of intake air is
small is less than the specified time.
Judgement Criterion
• After the estimated engine coolant temperature
rises above 77° C (171° F), the actual engine
coolant temperature is less than 77° C (171° F)
even though the specified time has passed.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 9
.
.
End
Yes
Malfunction
Estimate engine coolant temp.
Good
Specified time has passed?
No
No
Monitoring
conditions
Actual engine coolant
temp. >= 77˚C (171˚F)
Estimated engine coolant
temp. >= 77˚C (171˚F)
No
AK900356
Start
Yes
No
Yes
YES
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-222
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• The engine cooling system is faulty.
• ECM failed.
DIAGNOSIS
STEP 1. Check the cooling system.
Refer to GROUP 14, Engine Cooling Diagnosis
Q: Is the cooling system 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>
. Then go to Step 2.
NO : Repair it. Then go to Step 2.
STEP 2. Test the OBD-II drive cycle.
(1) Carry out test drive with the drive cycle pattern. Refer to
Diagnostic Function − OBD-II Drive Cycle − Pattern 9
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0128 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-223
13A
DTC P0131: Heated Oxygen Sensor (front) Circuit Low Voltage
.
AK704249
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
1
10 111213 14
19 20
2 3 4
7 8 9
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
0.5 V
AB
1
4
2
3
39
SKY BLUE
SKY BLUE
38
HEATED OXYGEN SENSOR (FRONT) CIRCUIT
B-09
C-34
6
RED
RED
7
A-13
HEATED OXYGEN SENSOR
(FRONT)
FROM MFI RELAY
TO ECM
ENGINE
CONTROL
MODULE
AK704229AB
Connector: A-13
A-13
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-224
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 38) from the output terminal (terminal
No. 3) of the heated oxygen sensor (front).
• Terminal No. 4 of the heated oxygen sensor
(front) is grounded with ECM (terminal No. 39).
• The ECM applies an offset voltage of 0.5 volt to
terminal No. 4 of the heated oxygen sensor
(front).
.
TECHNICAL DESCRIPTION
• The heated oxygen sensor (front) detects the
concentration of oxygen in the exhaust gas; it
converts those data to voltage, and inputs the
resulting signals to the ECM.
• When the heated oxygen sensor (front) begins to
deteriorate, the heated oxygen sensor signal
response becomes poor.
• The ECM checks for the heated oxygen sensor
(front) output voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (front) 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) heater monitor
• Misfire monitor
• Fuel system monitor
• Heated oxygen sensor (rear) feedback control
system monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
• Accelerator pedal position sensor
.
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