Nissan Note E12. Instruction — part 215
P0139 HO2S2
EC-199
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
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1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector 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 open circuit or short to ground or short to power in harness or connectors.
5.
CHECK HEATED OXYGEN SENSOR 2
EC-199, "Component Inspection"
Is the inspection result normal?
YES
>> Refer to
GI-41, "Intermittent Incident"
.
NO
>> Replace heated oxygen sensor 2. Refer to
.
Component Inspection
INFOID:0000000009582430
1.
INSPECTION START
Do you have CONSULT?
Do you have CONSULT?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK HEATED OXYGEN SENSOR 2
With CONSULT
1. Turn ignition switch ON and select “ENGINE” using CONSULT.
2. Select “DATA MONITOR” mode.
3. Start engine and warm it up to the normal operating temperature.
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 “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)” as the monitor item with
CONSULT.
8. Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to
±25%.
HO2S2
ECM
Continuity
Connector
Terminal
Connector
Terminal
E63
4
F11
50
Existed
HO2S2
Ground
Continuity
Connector
Terminal
E63
4
Ground
Not existed
ECM
Ground
Continuity
Connector
Terminal
F11
50
Ground
Not existed
JSBIA1202GB
EC-200
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P0139 HO2S2
“HO2S2 (B1)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)” should be below 0.50 V at least once when the “FUEL INJECTION” is
−25%.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 5.
3.
CHECK HEATED OXYGEN SENSOR 2-I
Without CONSULT
1. Start engine and warm it up to the 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 terminals under 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 terminals under 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 terminals under the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace malfunctioning heated oxygen sensor 2. Refer to
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
F11
50
(HO2S2)
59
Revving up to 4,000 rpm under no load at
least 10 times
The voltage should be above 0.78 V at
least once during this procedure.
The voltage should be below 0.50 V at
least once during this procedure.
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
F11
50
(HO2S2)
59
Keeping engine at idle for 10 minutes
The voltage should be above 0.78 V at
least once during this procedure.
The voltage should be below 0.50 V at
least once during this procedure.
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
F11
50
(HO2S2)
59
Coasting from 80 km/h (50 MPH) in D po-
sition (CVT), 4th gear position (M/T)
The voltage should be above 0.78 V at
least once during this procedure.
The voltage should be below 0.50 V at
least once during this procedure.
P0171 FUEL INJECTION SYSTEM FUNCTION
EC-201
< DTC/CIRCUIT DIAGNOSIS >
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P0171 FUEL INJECTION SYSTEM FUNCTION
DTC Logic
INFOID:0000000009022553
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 sensor 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 may 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.
Is 1st trip DTC detected?
YES
>> Proceed to
.
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
DTC detecting condition
Possible cause
P0171
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-202
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P0171 FUEL INJECTION SYSTEM FUNCTION
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:0000000009022554
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.
NO
>> GO TO 2.
2.
CHECK FOR INTAKE AIR LEAK AND PCV HOSE
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.
NO
>> GO TO 3.
3.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
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.
5. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.
VHCL SPEED SE
50 - 120 km/h (31 - 75 MPH)
PBIB1216E
A/F sensor 1
ECM
Continuity
Connector
Terminal
Connector
Terminal
F12
1
F11
49
Existed
2
53
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