Juke F15 (2012 year). Service Repair Manual — part 126
P0137 HO2S2
EC-225
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
D
E
F
G
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A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Coasting from 80 km/h (50 MPH) in
D position (CVT), 4th gear position
(M/T)
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
EC-226
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0138 HO2S2
P0138 HO2S2
DTC Logic
INFOID:0000000006547002
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/
F) sensor 1. The oxygen storage capacity of the three way catalyst (manifold) causes the longer switching
time.
MALFUNCTION A
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the voltage is unusually high during the various driving con-
dition such as fuel-cut.
MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor is sufficiently low during the
various driving condition such as fuel-cut.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
PBIB1848E
PBIB2376E
DTC No.
Trouble diagnosis name
(Trouble diagnosis con-
tent)
DTC detecting condition
Possible cause
P0138
HO2S2 (B1)
(Heated oxygen sensor 2
circuit high voltage)
A)
An excessively high voltage from the
sensor is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
B)
The minimum voltage from the sensor is
not reached to the specified voltage.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
P0138 HO2S2
EC-227
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
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2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 2 minutes.
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO-1
>> With CONSULT-III: GO TO 3.
NO-2
>> Without CONSULT-III: GO TO 5.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°
C (32 to 86
°
F).
1.
Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT-III.
2.
Start engine and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
Make sure that “COOLAN TEMP/S” indication is more than 70
°
C (158
°
F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70
°
C (158
°
F).
7.
Open engine hood.
8.
Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT-
III.
9.
Follow the instruction of CONSULT-III.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT-III
OK
>> INSPECTION END
NG
>> Proceed to
.
CAN NOT BE DIAGNOSED>>GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN
1.
Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2.
Perform DTC confirmation procedure again.
>> GO TO 3.
5.
PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B
Perform component function check. Refer to
NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Component Function Check
INFOID:0000000006601195
1.
PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector and ground as per the following condition.
EC-228
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0138 HO2S2
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000006547004
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
Which malfunction is detected?
A
>> GO TO 2.
B
>> GO TO 7.
2.
CHECK HO2S2 CONNECTOR FOR WATER
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Check connectors for water.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be above 0.68 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Keeping engine speed at idle for 10
minutes
The voltage should be above 0.68 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Coasting from 80 km/h (50 MPH) in
D position (CVT), 4th gear position
(M/T)
The voltage should be above 0.68 V
at least once during this procedure.
Water should not exist.
P0138 HO2S2
EC-229
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
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EC
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3.
CHECK HO2S2 GROUND CIRCUIT
1.
Disconnect ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ECM harness connector.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to
EC-231, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F69
1
F25
33
Existed
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F69
4
F25
29
Existed
+
−
Continuity
HO2S2
Connector
Terminal
F69
4
Ground
Not existed
+
−
Continuity
ECM
Connector
Terminal
F25
29
Ground
Not existed
EC-230
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0138 HO2S2
>> INSPECTION END
7.
CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1.
Clear the mixture ratio self-learning value. Refer to
.
2.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0172. Refer to
.
NO
>> GO TO 8.
8.
CHECK HO2S2 GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between HO2S2 harness connector and ECM harness connector.
5.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace error-detected parts.
9.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to
EC-231, "Component Inspection"
.
Is the inspection result normal?
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F69
1
F25
33
Existed
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F69
4
F25
29
Existed
+
−
Continuity
HO2S2
Connector
Terminal
F69
4
Ground
Not existed
+
−
Continuity
ECM
Connector
Terminal
F25
29
Ground
Not existed
P0138 HO2S2
EC-231
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
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F
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N
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YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> GO TO 11.
11.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
Component Inspection
INFOID:0000000006547005
1.
INSPECTION START
Do you have CONSULT-III?
Do you have CONSULT-III?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK HEATED OXYGEN SENSOR 2
With CONSULT-III
1.
Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT-III.
2.
Start engine and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
Select “FUEL INJECTION” in “ACTIVE TEST” mode of “ENGINE” using CONSULT-III, and select “HO2S2
(B1)” as the monitor item with CONSULT-III.
7.
Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to
±
25%.
“HO2S2 (B1)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)” should be below 0.18 V at least once when the “FUEL INJECTION” is
−
25%.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
3.
CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector and ground as per the following condition.
PBIB3458E
EC-232
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0138 HO2S2
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
4.
CHECK HEATED OXYGEN SENSOR 2-II
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 5.
5.
CHECK HEATED OXYGEN SENSOR 2-III
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Keeping engine speed at idle for 10
minutes
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Coasting from 80 km/h (50 MPH) in
D position (CVT), 4th gear position
(M/T)
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
P0139 HO2S2
EC-233
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
D
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F
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EC
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P0139 HO2S2
DTC Logic
INFOID:0000000006547007
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-
gen storage capacity of the three way catalyst 1 causes the longer
switching time. To judge the malfunctions of heated oxygen sensor
2, ECM monitors whether the switching response of the sensor's
voltage is faster than specified during various driving conditions such
as fuel cut.
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Do you have CONSULT-III?
Do you have CONSULT-III?
YES
>> GO TO 2.
NO
>> GO TO 6.
2.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°
C (32 to 86
°
F).
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1.
Start engine and warm it up to the normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6.
Let engine idle for 1 minute.
7.
Select “DATA MONITOR” mode of “ENGINE” using CONSULT-III.
8.
Make sure that “COOLAN TEMP/S” indicates more than 70
°
C (158
°
F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70
°
C (158
°
F).
9.
Open engine hood.
10. Select “HO2S2 (B1) P0139” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT-III.
SEF302U
DTC No.
Trouble diagnosis name
(Trouble diagnosis con-
tent)
DTC detecting condition
Possible cause
P0139
HO2S2 (B1)
(Heated oxygen sensor
2 circuit slow response)
The switching time between rich and lean of a
heated oxygen sensor 2 signal delays more
than the specified time computed by ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel system
• Intake air system
EC-234
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0139 HO2S2
11. Start engine and follow the instruction of CONSULT-III display.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
Is “COMPLETED” displayed on CONSULT-III screen?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE AGAIN
1.
Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2.
Perform DTC confirmation procedure again.
>> GO TO 3.
5.
PERFORM SELF-DIAGNOSIS
With CONSULT-III
Perform ECM self-diagnosis.
Is DTC “P0139” detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
6.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-234, "Component Function Check"
NOTE:
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
Component Function Check
INFOID:0000000006601196
1.
PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector and ground as per the following condition.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be above 0.68 V
at least once during this procedure.
P0139 HO2S2
EC-235
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000006547009
1.
CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1.
Clear the mixture ratio self-learning value. Refer to
.
2.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0171 or P0172. Refer to
.
NO
>> GO TO 2.
2.
CHECK HO2S2 GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between HO2S2 harness connector and ECM harness connector.
5.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Keeping engine speed at idle for 10
minutes
The voltage should be above 0.68 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Coasting from 80 km/h (50 MPH) in
D position (CVT), 4th gear position
(M/T)
The voltage should be above 0.68 V
at least once during this procedure.
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F69
1
F25
33
Existed
EC-236
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0139 HO2S2
2.
Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to
EC-236, "Component Inspection"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-42, "Intermittent Incident"
.
NO
>> GO TO 5.
5.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
Component Inspection
INFOID:0000000006547010
1.
INSPECTION START
Do you have CONSULT-III?
Do you have CONSULT-III?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK HEATED OXYGEN SENSOR 2
With CONSULT-III
1.
Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT-III.
2.
Start engine and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F69
4
F25
29
Existed
+
−
Continuity
HO2S2
Connector
Terminal
F69
4
Ground
Not existed
+
−
Continuity
ECM
Connector
Terminal
F25
29
Ground
Not existed
P0139 HO2S2
EC-237
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
5.
Let engine idle for 1 minute.
6.
Select “FUEL INJECTION” in “ACTIVE TEST” mode of “ENGINE” using CONSULT-III, and select “HO2S2
(B1)” as the monitor item with CONSULT-III.
7.
Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to
±
25%.
“HO2S2 (B1)” should be above 0.68 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)” should be below 0.18 V at least once when the “FUEL INJECTION” is
−
25%.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
3.
CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
4.
CHECK HEATED OXYGEN SENSOR 2-II
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 5.
5.
CHECK HEATED OXYGEN SENSOR 2-III
Check the voltage between ECM harness connector and ground as per the following condition.
PBIB3458E
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Keeping engine speed at idle for 10
minutes
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
EC-238
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0139 HO2S2
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.
• Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
29
33
Coasting from 80 km/h (50 MPH) in
D position (CVT), 4th gear position
(M/T)
The voltage should be above 0.68 V
at least once during this procedure.
The voltage should be below 0.18 V
at least once during this procedure.
P0171 FUEL INJECTION SYSTEM FUNCTION
EC-239
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P0171 FUEL INJECTION SYSTEM FUNCTION
DTC Logic
INFOID:0000000006547014
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the A/F sensors 1. The ECM calcu-
lates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-I
1.
Clear the mixture ratio self-learning value. Refer to
.
2.
Start engine.
Is it difficult to start engine?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
RESTART ENGINE
If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal.
NOTE:
When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
Does engine start?
YES
>> Proceed to
.
NO
>> Check exhaust and intake air leak visually.
4.
PERFORM DTC CONFIRMATION PROCEDURE-II
1.
Start engine and let it idle for at least 5 minutes.
2.
Check 1st trip DTC.
Sensor
Input signal to ECM
ECM function
Actuator
A/F sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel injection control
Fuel injector
DTC No.
Trouble diagnosis name
(Trouble diagnosis con-
tent)
DTC detecting condition
Possible cause
P0171
FUEL SYS-LEAN-B1
(Fuel injection system too
lean)
• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too
large. (The mixture ratio is too lean.)
• Intake air leaks
• A/F sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection
EC-240
< DTC/CIRCUIT DIAGNOSIS >
[MR16DDT ]
P0171 FUEL INJECTION SYSTEM FUNCTION
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 5.
5.
PERFORM DTC CONFIRMATION PROCEDURE-III
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Start engine.
3.
Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.
CAUTION:
Always drive vehicle at a safe speed.
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006547015
1.
CHECK EXHAUST GAS LEAK
1.
Start engine and run it at idle.
2.
Listen for an exhaust gas leak before three way catalyst (manifold).
Is exhaust gas leak detected?
YES
>> Repair or replace error-detected parts.
NO
>> GO TO 2.
2.
CHECK FOR INTAKE AIR LEAK
1.
Listen for an intake air leak after the mass air flow sensor.
2.
Check PCV hose connection.
Intake air leak detected?
YES
>> Repair or replace error-detected parts.
NO
>> GO TO 3.
3.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect corresponding A/F sensor 1 harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
VHCL SPEED SE
50 - 120 km/h (31 - 75 MPH)
PBIB1216E
+
−
Continuity
A/F sensor 1
ECM
Connector
Terminal
Connector
Terminal
F70
1
F25
21
Existed
2
25
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