Mitsubishi Evolution X. Manual — part 275
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-77
DTC P0037: Heated Oxygen Sensor (rear) Heater Circuit Low
AK704230
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3
2
4
2
8
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4
3
11
21
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9
22
1
10
2
8
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3
11
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22
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10
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
1
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
1
2
3 4 5 6
WHITE
WHITE
HEATED OXYGEN SENSOR (REAR) HEATER CIRCUIT
36
FUSIBLE LINK
AB
D-35
4
1
20A
WHITE
A-34X
4
3
1
2
22
C-47
B-09
OFF
ON
C-43
1
4
2
3
RED-
GREEN
RED-
GREEN
11
10
2
C-45
A-13
35
J/C(4)
HEATED OXYGEN SENSOR
(REAR)
RELAY BOX
(ENGINE COMPARTMENT)
BR
O
W
N
BR
O
W
N
ENGINE
CONTROL
MODULE
TO ECM
TO ECM
TO ECM
MFI
RELAY
BR
O
W
N
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-78
.
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.
• The ECM checks whether the heater voltage is
within a specified range when the heater is not
energized.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (rear) heater current or volt-
age 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-79
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 lower than 0.17 ampere for 2
seconds.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the heated oxygen sensor (rear) heater is
off.
• Battery positive voltage is between 11 and 16.5
volts.
Judgement Criterion
• The heated oxygen sensor (rear) heater voltage
has continued to be lower than 2.0 volts for 2 sec-
onds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
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-80
.
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:)
• Open or shorted heated oxygen sensor (rear)
heater circuit, or harness damage.
• Heated oxygen sensor (rear) heater failed.
• Connector damage.
• ECM failed.
DIAGNOSIS
Required Special Tools:
• MB991658: Test Harness
• MB992110: Power Plant ECU Check Harness
STEP 1. Check harness connector D-35 at the heated
oxygen sensor (rear) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
STEP 2. 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 3.
NO : Replace the heated oxygen sensor (rear). Then go to
Step 12.
STEP 3. Measure the power supply voltage at heated
oxygen sensor (rear) harness side connector D-35.
(1) Disconnect the connector D-35 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
AK604492AB
MB991658
Heated oxygen
sensor component
side connector
AK604172
2 1
4 3
D-35 harness
connector:
component side
AI
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