Mitsubishi Evolution X. Manual — part 274
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-73
DTC P0032: Heated Oxygen Sensor (front) Heater Circuit High
AK704225
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3
2
4
1
2
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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
2
8
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3
11
21
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22
1
10
HEATED OXYGEN SENSOR (FRONT) HEATER CIRCUIT
20A
WHITE
BLUE-BLA
CK
WHITE
WHITE
A-34X
MFI
RELAY
RELAY BOX
(ENGINE COMPARTMENT)
4
3
1
2
22
TO ECM
HEATED OXYGEN SENSOR
(FRONT)
1
4
2
3
TO ECM
TO ECM
ENGINE
CONTROL
MODULE
34
C-34
B-09
A-13
36
FUSIBLE LINK
BLUE
8
OFF
ON
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-74
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 2) to the heated oxygen sensor (front) heater.
• The ECM (terminal No. 34) controls continuity to
the heated oxygen sensor (front) 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 (front) 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
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-75
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 (front) heater is
on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The heated oxygen sensor (front) 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 (front) heater 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-76
DIAGNOSIS
Required Special Tool:
• MB991658: Test Harness
STEP 1. Check the heated oxygen sensor (front).
(1) Disconnect heated oxygen sensor (front) connector C-34
and connect test harness special tool, MB991658, to the
connector on the heated oxygen sensor (front) 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 (front). 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 P0032 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 P0032 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK604492AB
MB991658
Heated oxygen
sensor component
side connector
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