Mitsubishi Lancer Evolution X. Manual — part 299
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-261
Check Conditions
• Engine coolant temperature is higher than 76° C
(169° F).
• The heated oxygen sensor (front) is active.
• The cumulative mass airflow sensor output is
1,638 g or higher.
• Fuel is being shut off.
• Heated oxygen sensor (rear) output voltage is 0.5
volt or higher when fuel cut is started.
• It has been taking more than 180 seconds since
the drive signal of the heated oxygen sensor
(rear) heater was turned on.
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
Judgement Criterion
• Heated oxygen sensor (rear) output voltage does
not reach 0.2 volt for 6.0 seconds from fuel cut
start.
Check Conditions
• Engine coolant temperature is higher than 76° C
(169° F).
• The heated oxygen sensor (front) is active.
• The cumulative mass airflow sensor output is
1,638 g or higher.
• Fuel is being shut off.
• The heated oxygen sensor (rear) output voltage
is higher than 0.5 volt when fuel cut is started.
• It has been taking more than 180 seconds since
the drive signal of the heated oxygen sensor
(rear) heater was turned on.
• Barometric pressure is higher than 76 kPa (22.4
in.Hg).
• The ECM monitors for this condition for 3 cycles
of 0.5 second each during drive cycles.
Judgement Criteria
• The heated oxygen sensor (rear) output voltage
does not reach 0.2 volt for 0.5 second from 0.4
volt while fuel is being shut off.
• The ECM monitors for this condition once during
the drive cycle.
.
NOTE: Monitoring stops after fuel has been shut off
for 64 seconds or more.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 10
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Heated oxygen sensor (rear) deteriorated.
• Connector damage.
• ECM failed.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-262
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, check data list item
AD: Heated Oxygen Sensor (rear).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
AD, Heated Oxygen Sensor (rear).
(4) Warm up the engine.
• After increasing the output voltage 0.5 volt or more by
the engine revving, finish it. Then confirm that the output
voltage reduces to 0.2 volt or less within 6 seconds.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : 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
.
NO : Replace the heated oxygen sensor (rear). Then go to
Step 2.
STEP 2. 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 10
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?
YES : Refer to DTC P0137 − Heated Oxygen Sensor (rear)
Circuit Low Voltage
, DTC P0138 − Heated
Oxygen Sensor (rear) Circuit High Voltage
.
NO : The inspection is complete.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-263
DTC P0140: Heated Oxygen Sensor (rear) Circuit No Activity Detected
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-264
.
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 does not
change during specified go/stop operations
including fuel cut are repeated.
.
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
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