Mitsubishi Lancer Evolution X. Manual — part 290
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-225
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 (front) 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 (front) failed.
• Open or shorted circuit in heated oxygen sensor
(front) output line, or harness damage.
• Open circuit in heated oxygen sensor (front)
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
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DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness
• MB992110: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, check data list item
AC: Heated Oxygen Sensor (front).
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
AC, Heated Oxygen Sensor (front).
• Warm up the engine. When the engine is revved, the
output voltage should measure 0.6 to 1.0 volt.
• Warm up the engine. When the engine is idling, the out-
put voltage should repeat 0.4 volt or less and 0.6 to 1.0
volt alternately.
(4) 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 : Go to Step 2.
STEP 2. Measure the sensor output voltage at heated
oxygen sensor (front) connector C-34 by backprobing
(1) Do not disconnect the connector C-34.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 3 and ground by
backprobing.
• Warm up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0.4 volt or less and 0.6
to 1.0 volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 3.
NO : Go to Step 8.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AK604183
1 2
3 4
AH
C-34 harness
connector:
harness side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-227
STEP 3. Check harness connector B-09 at the ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
STEP 4. Measure the sensor output voltage at ECM
connector B-09 by using power plant ECU check harness
special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant
ECU check harness special tool MB992110 between the
separated connectors.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 38 and ground.
• Warm up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0.4 volt or less and 0.6
to 1.0 volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 5.
NO : Go to Step 7.
STEP 5. Check harness connector C-34 at heated oxygen
sensor (front) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK604040
ECM
AB
Body side harness
MB992110
AK604184
16 15 14 13 12 11 10 9 8 7 6 5 4 3
2
1
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AB
Power plant ECU
check harness connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-228
STEP 6. Using scan tool MB991958, check data list item
AC: Heated Oxygen Sensor (front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item
AC, Heated Oxygen Sensor (front).
• Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.
• Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 volt or less and 0.6 to
1.0 volt alternately.
(3) 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 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>
STEP 7. Check harness connector C-34 at heated oxygen
sensor (front) for damage.
Q: Is the harness connector in good condition?
YES : Check harness connector A-13 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector is in
good condition, repair harness wire between heated
oxygen sensor (front) connector C-34 (terminal No. 3)
and ECM connector B-09 (terminal No. 38) because
of open circuit or harness damage. Then go to Step
14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
STEP 8. Check harness connector C-34 at heated oxygen
sensor (front) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
STEP 9. Check harness connector B-09 at the ECM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
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