Mitsubishi Outlander XL. Manual — part 270
DTC P0157: Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 2)
M11310100198USA0000010000
ZK602841
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
2
1
4
3
0.5 V
AA00
ENGINE
CONTROL
MODULE
LEFT BANK HEATED
OXYGEN SENSOR (REAR)
FROM MFI RELAY
TO ECM
1
2
3
4
41
YELLO
W
ORANGE
40
LEFT BANK HEATED OXYGEN SENSOR (REAR) CIRCUIT
B-10
B-13
MU802665
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-275
DIAGNOSTIC TROUBLE CODE PROCEDURES
ZK603595AA00
Left bank heated
oxygen sensor (rear)
Front
exhaust pipe
B-13 (GR)
Connector: B-13
ZK603591
ECM
B-10 (GR)
Connector: B-10
AA00
CIRCUIT OPERATION
⦆
A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the ECM
(terminal No. 40) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor (rear).
⦆
Terminal No. 2 of the left bank heated oxygen
sensor (rear) is grounded with ECM (terminal No.
41).
⦆
The ECM applies an offset voltage of 0.5 volt to
terminal No. 2 of the left bank heated oxygen sensor
(rear).
TECHNICAL DESCRIPTION
⦆
The output signal of the left bank heated oxygen
sensor (front) is compensated by the output signal
of the left bank heated oxygen sensor (rear).
⦆
The ECM check for the left bank heated oxygen
sensor (rear) output voltage.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (rear) out put 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)
⦆
Heated oxygen sensor heater (front) monitor
⦆
Heated oxygen sensor heater (rear) monitor
⦆
Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
⦆
Mass airflow sensor
13Ab-276
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
⦆
Engine coolant temperature sensor
⦆
Intake air temperature sensor
⦆
Barometric pressure sensor
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
⦆
Left bank 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:)
⦆
Left bank heated oxygen sensor (rear) failed.
⦆
Connector damage.
⦆
Harness damage.
⦆
ECM failed.
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-277
DIAGNOSTIC TROUBLE CODE PROCEDURES
DIAGNOSIS
Required Special Tools:
⦆
MB991316: Test Harness
STEP 1. Check harness connector B-13 at the left bank
heated oxygen sensor (rear) and harness connector B-10 at
the ECM 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 P.00E-2. Then go to Step 5.
STEP 2. Check the left bank heated oxygen sensor (rear).
(1)
Disconnect the left bank heated oxygen sensor (rear)
connector B-13 and connect test harness special tool,
MD991316 to the connector on the left bank heated oxygen
sensor (rear) 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.
(4)
Connect a digital voltage meter between terminal No. 1 (red
clip) and terminal No. 3 (blue clip).
(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 measured resistance between 11 and 18 ohms [at
20°C (68°F)?
YES:
Go to Step 3.
NO:
Replace the left bank heated oxygen sensor (rear).
Then go to Step 5.
STEP 3. Check for harness between the left bank heated
oxygen sensor (rear) connector B-13 and ECM connector
B-10.
(1)
Disconnect the left bank heated oxygen sensor (rear)
connector B-13 and the ECM connector B-10.
(2)
Measure the resistance between the heated oxygen sensor
connector B-13 and the ECM connector B-10.
13Ab-278
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
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