Mitsubishi Lancer Evolution X. Manual — part 297
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-253
STEP 12. Check for short circuit to ground and harness
damage between heated oxygen sensor (rear) connector
D-35 (terminal No. 3) and ECM connector B-09 (terminal
No. 40).
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 13.
NO : Repair it. Then go to Step 14.
STEP 13. Check the heated oxygen sensor (rear).
(1) Disconnect the heated oxygen sensor (rear) connector
D-35 and connect test harness special tool MB991658 to
the connector on the heated oxygen sensor (rear) side.
(2) Warm up the engine until engine coolant temperature
reaches 80° C (176° F) or higher.
(3) Drive at 50 km/h (31mph) or more for 10 minutes.
(4) Connect a digital voltage meter between terminal No. 3 and
terminal No. 4.
(5) Measure the output voltage of heated oxygen sensor under
the following driving.
• Transaxle: 2nd speed
• Drive with wide open throttle
• Engine: 3,500 r/min or more
Standard value: 0.6 − 1.0 V
NOTE: If the temperature of sensing area does not reach
the high temperature [of approximately 400
°
C (752
°
F) or
more] even though the heated oxygen sensor is normal, the
output voltage would be possibly low in spite of the rich
air/fuel ratio.
NOTE: When the vehicle is driven with high loads, the tem-
perature of the sensing area of the heated oxygen sensor is
sufficiently high. Thus, it is not necessary to apply the volt-
age to the heater.
Q: Is the measured voltage between 0.6 and 1.0 volt?
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 : Replace the heated oxygen sensor (rear). Then go to
Step 14.
AK604493AB
MB991658
Heated oxygen
sensor component
side connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-254
STEP 14. 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 22
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0137 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0138: Heated Oxygen Sensor (rear) Circuit High 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-255
.
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 over
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
.
AK704229AB
Connector: A-13
A-13
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704251
Connector: C-45
C-45
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-256
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the engine
starting sequence was completed.
• Heated oxygen sensor offset voltage is between
0.4 and 0.6 volt.
Judgement Criterion
• Heated oxygen sensor (rear) output voltage has
continued to be 1.8 volts or higher for 2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function − OBD-II Drive Cycle −
Pattern 23
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Short circuit in heated oxygen sensor (rear) out-
put line.
• Connector damage.
• ECM failed.
End
Malfunction
No
No
No
2secs have passed?
Output voltage
> 1.8V
Good
AK604322
Start
Yes
Yes
Yes
Monitoring
conditions
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