Nissan Altima L32. Instruction — part 260
P0043, P0044 HO2S3 HEATER
EC-161
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P0043, P0044 HO2S3 HEATER
Description
INFOID:0000000004349204
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 3 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
OPERATION
DTC Logic
INFOID:0000000004349205
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
CAUTION:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
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 the engine and drive vehicle at a speed of 80 km/h (50 MPH) or more for at least 3 consecutive min-
utes.
Sensor
Input signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Engine speed
Heated oxygen sensor 3
heater control
Heated oxygen sensor 3 heater
Crankshaft position sensor (POS)
Engine coolant temperature sensor
Engine coolant temperature
Mass air flow sensor
Amount of intake air
Engine speed
Heated oxygen sensor 3 heater
Above 3,600 rpm
OFF
Below 3,600 rpm after the following conditions are met.
• Engine: After warming up
• Driving for 3 minutes at a speed of 80 km/h (50 MPH) or more
(Keep the vehicle speed as steady as possible during the cruising.)
ON
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0043
Heated oxygen
sensor 3 heater
control circuit low
The current amperage in the heated oxygen sen-
sor 3 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 3 heater.)
• Harness or connectors
(The heated oxygen sensor 3 heater circuit is
open or shorted.)
• Heated oxygen sensor 3 heater
P0044
Heated oxygen
sensor 3 heater
control circuit high
The current amperage in the heated oxygen sen-
sor 3 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 3 heater.)
• Harness or connectors
(The heated oxygen sensor 3 heater circuit is
shorted.)
• Heated oxygen sensor 3 heater
EC-162
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0043, P0044 HO2S3 HEATER
NOTE:
Keep the vehicle speed as steady as possible during the cruising.
4. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004349206
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK HO2S3 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 3 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between HO2S3 harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F58, F101
• IPDM E/R harness connector F10
• 15A fuse (No. 37)
• Harness for open or short between heated oxygen sensor 3 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK HO2S3 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between HO2S3 harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
HO2S3
Ground
Voltage
Connector
Terminal
F102
2
Ground
Battery voltage
MBIB0186E
HO2S3
ECM
Continuity
Connector
Terminal
Connector
Terminal
F102
3
F14
17
Existed
P0043, P0044 HO2S3 HEATER
EC-163
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• Harness connectors F58, F101
• Harness for open or short between heated oxygen sensor 3 and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK HEATED OXYGEN SENSOR 3 HEATER
EC-163, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
REPLACE HEATED OXYGEN SENSOR 3
Replace heated oxygen sensor 3.
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 J-43897-12)] and approved anti-seize lubricant (commercial
service tool).
>> INSPECTION END
8.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000004349207
1.
CHECK HEATED OXYGEN SENSOR 3 HEATER
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 3 harness connector.
3. Check resistance between HO2S3 terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE HEATED OXYGEN SENSOR 3
Replace heated oxygen sensor 3.
Terminal
Resistance
2 and 3
3.4 - 4.4
Ω [at 25°C (77°F)]
1 and 2, 3, 4
∞Ω
(Continuity should not exist)
4 and 1, 2, 3
PBIB3310E
EC-164
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0043, P0044 HO2S3 HEATER
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 J-43897-12)] and approved anti-seize lubricant (commercial
service tool).
>> INSPECTION END
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