Nissan Altima L32. Instruction — part 259
P0031, P0032 A/F SENSOR 1 HEATER
EC-157
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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Component Inspection
INFOID:0000000004349199
1.
CHECK AIR FUEL RATIO (A/F) SENSOR 1
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check resistance between A/F sensor 1 terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1.
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
Terminals
Resistance
3 and 4
1.98 - 2.66
Ω [at 25°C (77°F)]
3 and 1, 2
∞ Ω
(Continuity should not exist)
4 and 1, 2
PBIB3309E
EC-158
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P0037, P0038 HO2S2 HEATER
P0037, P0038 HO2S2 HEATER
Description
INFOID:0000000004349200
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
OPERATION
DTC Logic
INFOID:0000000004349201
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 more than 11V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to the 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. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Sensor
Input signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
Engine speed
Heated oxygen sensor 2
heater control
Heated oxygen sensor 2 heater
Engine coolant temperature sensor
Engine coolant temperature
Mass air flow sensor
Amount of intake air
Engine speed
Heated oxygen sensor 2 heater
Above 3,600 rpm
OFF
Below 3,600 rpm after the following conditions are met.
• Engine: After warming up
• Keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no load
ON
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0037
Heated oxygen
sensor 2 heater
control circuit low
The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
• Harness or connectors
(The heated oxygen sensor 2 heater circuit is
open or shorted.)
• Heated oxygen sensor 2 heater
P0038
Heated oxygen
sensor 2 heater
control circuit high
The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
• Harness or connectors
(The heated oxygen sensor 2 heater circuit is
shorted.)
• Heated oxygen sensor 2 heater
P0037, P0038 HO2S2 HEATER
EC-159
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004349202
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 HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Turn ignition switch ON.
3. Check the voltage between HO2S2 harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R connector F10
• 15A fuse (No. 37)
• Harness for open or short between heated oxygen sensor 2 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between HO2S2 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 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK HEATED OXYGEN SENSOR 2 HEATER
EC-160, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2.
HO2S2
Ground
Voltage
Connector
Terminal
F42
2
Ground
Battery voltage
MBIB0186E
HO2S2
ECM
Continuity
Connector
Terminal
Connector
Terminal
F42
3
F14
13
Existed
EC-160
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0037, P0038 HO2S2 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
7.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000004349203
1.
CHECK HEATED OXYGEN SENSOR 2 HEATER
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Check resistance between HO2S2 terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2.
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
Terminals
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
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