Mitsubishi Outlander XL. Manual — part 260
DTC P0143: Heated Oxygen Sensor Circuit Low Voltage (bank 1, sensor 3) <California>
M11310100363USA0000010000
ZK602864
1 2
3 4
71 72 73 74 75 76 77 78 79 80 81 82
83 84 85 86 87 88 89 90 91 92 93 94
95 96 97 98 99
100 101 102 103 104
112 113 114
109
108
107
110 111
115 116
106
105
118
117
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
AA00
D-30
FROM MFI RELAY
TO ECM
1
4
2
3
CENTER EXHAUST PIPE HEATED OXYGEN SENSOR CIRCUIT
CENTER EXHAUST PIPE
HEATED OXYGEN
SENSOR
B-11
YELLO
W
ORANGE
ORANGE
YELLO
W
ENGINE
CONTROL
MODULE
0.5 V
C-129
15
116
101
17
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-235
DIAGNOSTIC TROUBLE CODE PROCEDURES
ZK600417 AA00
Center exhaust pipe
heated oxygen sensor
Connector: D-30
D-30 (B)
Rear heater duct
ZK603592
ECM
B-11 (GR)
Connector: B-11
AA00
ZK603651AA00
C-129
Connector: C-129
CIRCUIT OPERATION
⦆
A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the ECM
(terminal No. 101) from the output terminal (terminal
No. 3) of the Center exhaust pipe heated oxygen
sensor.
⦆
Terminal No. 4 of the Center exhaust pipe heated
oxygen sensor is grounded with ECM (terminal No.
116).
⦆
The ECM applies an off set voltage of 0.5 volt to
terminal No. 4 of the Center exhaust pipe heated
oxygen sensor.
DECHNICAL DESCRIPTION
The ECM checks for the right bank heated oxygen
sensor (rear) output voltage.
DESCRIPTIONS OF MONITOR METHODS
Center exhaust pipe heated oxygen sensor output
voltage is under the 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)
⦆
Center exhaust pipe heated oxygen sensor heater
(front) monitor
Sensor (The sensor below is determined to be
normal)
⦆
Engine coolant temperature sensor
13Ab-236
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
DTC SET CONDITIONS
Logic Flow Chart
End
Malfunction
Yes
Yes
Yes
No
No
No
2secs have passed?
Output voltage
< 0.2V
Monitoring
conditions
Good
Start
ZK603708 AA00
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.
⦆
3 minutes or more have passed since the engine
starting sequence was completed.
Judgement Criterion
⦆
Center exhaust pipe heated oxygen sensor output
voltage is lower than 0.2 volt for 2 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 23 P.13Ab-8.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
⦆
Center exhaust pipe Heated oxygen sensor failed.
⦆
Connector damage.
⦆
Harness damage
⦆
ECM failed.
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-237
DIAGNOSTIC TROUBLE CODE PROCEDURES
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
STEP 1. Check harness connector D-30 at the center
exhaust pipe heated oxygen sensor and harness connector
B-11 at the ECM for damage.
Q:Is the harness connector in good condition?
YES:
Go to Step 2.
NO:
Repair it. Refer to GROUP 00E, Harness Connector
Inspection P.00E-2. Then go to Step 4.
STEP 2. Check the center exhaust pipe heated oxygen
sensor (rear).
(1)
Disconnect the center exhaust pipe heated oxygen sensor
connector D-30 and connect test harness special tool,
MB991658, to the connector on the right bank heated oxygen
sensor side.
(2)
Warm up the engine until engine coolant temperature
reaches 80°C (176°F) or higher.
(3)
Drive at 50 km/h (31 mph) or more for 10 minutes.
ZK600444
MB991658
AA00
Heated oxygen
sensor component
side connector
(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.
a
.
Transaxle: 2nd speed
b
.
Drive with wide open throttle
c
.
Engine: 3,500 r/min or more
Standard value: 0.6 - 1.0 volts
NOTE:
If the sufficiently high temperature [of
approximate 400°C (752°F) or more] is not reached
although the heated oxygen sensor is normal, the output
voltage would be possibly low although the rich air/fuel
ratio.
Q:Is the voltage between 0.6 and 1.0 volts?
YES:
Go to Step 3.
NO:
Replace the center exhaust pipe heated oxygen sensor.
Then go to Step 4.
13Ab-238
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
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