Mitsubishi Evolution X. Manual — part 277
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-85
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 2) to the heated oxygen sensor (rear) heater.
• The ECM (terminal No. 35) controls continuity to
the heated oxygen sensor (rear) heater by turn-
ing the power transistor in the ECM "ON" and
"OFF".
.
TECHNICAL DESCRIPTION
• The ECM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor heater (rear) current is out of
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
AK704229AB
Connector: A-13
A-13
AK704226
Connector: A-34X
MFI relay
A-34X
AB
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704231
Connectors: C-43, C-45 and C-47
C-47
C-45
C-43 (B)
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-86
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the heated oxygen sensor (rear) heater is
on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The heated oxygen sensor (rear) heater current
has continued to be higher than 10.5 ampere for
2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 2
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Heated oxygen sensor (rear) failed.
• ECM failed.
End
No
No
Malfunction
Good
Current < 0.17A
or
Current > 10.5A
Voltage < 2.0V
AK604306
Heater ON
No
No
Start
Yes
Yes
Yes
Yes
Yes
No
Continuous
failure for 2secs
Monitoring
conditions
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-87
DIAGNOSIS
Required Special Tool:
• MB991658: Test Harness
STEP 1. Check the heated oxygen sensor (rear).
(1) Disconnect 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) Measure the resistance between heated oxygen sensor
connector terminal No. 1 and terminal No. 2.
Standard value: 4.5
− 8.0 Ω [at 20° C (68° F)]
Q: Is the measured resistance between 4.5 and 8.0
Ω [at
20
° C (68° F)]?
YES : Go to Step 2.
NO : Replace the heated oxygen sensor (rear). Then go to
Step 3.
STEP 2. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Pattern 2
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0038 set?
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 3.
NO : 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
.
STEP 3. 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 2
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0038 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK604492AB
MB991658
Heated oxygen
sensor component
side connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-88
DTC P0069: Abnormal Correlation Between Manifold Absolute Pressure Sensor And Barometric
Pressure Sensor
.
TECHNICAL DESCRIPTION
• The ECM detects abnormality in the sensor by
comparing the manifold absolute pressure sensor
output with the barometric pressure sensor out-
put.
.
DESCRIPTIONS OF MONITOR METHODS
The ECM compares the manifold absolute pressure
sensor output with the barometric pressure sen-
sor output while the engine control relay is in
"ON" position after the ignition switch is in
"LOCK" (OFF) position. When the difference
exceeds the specified value between them, the
ECM determines whether the manifold absolute
pressure sensor / the barometric pressure sensor
has malfunction or not.
.
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)
• Not applicable
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
• Manifold absolute pressure sensor
.
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