Nissan X-Trail 32. Manual — part 763
P0031, P0032 A/F SENSOR 1 HEATER
EC-181
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
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A
EC
N
P
O
P0031, P0032 A/F SENSOR 1 HEATER
DTC Description
INFOID:0000000010775110
DTC DETECTION LOGIC
POSSIBLE CAUSE
P0031
• Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.)
• The A/F sensor 1 heater
P0032
• Harness or connectors (The A/F sensor 1 heater circuit is shorted.)
• The A/F sensor 1 heater
FAIL-SAFE
Not applicable
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 11 V or more at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine and let it idle for at least 10 seconds.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010775111
1.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between A/F sensor 1 harness connector and ground.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P0031
A/F SEN1 HTR (B1)
(HO2S heater control circuit low bank 1
sensor 1)
An excessively low voltage signal is sent to ECM through the A/F sensor 1
heater.
P0032
A/F SEN1 HTR (B1)
(HO2S heater control circuit high bank 1
sensor 1)
An excessively high voltage signal is sent to ECM through the A/F sensor
1 heater.
+
Ground
Voltage
A/F sensor 1
Connector Terminal
F27
4
Ground
Battery voltage
EC-182
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P0031, P0032 A/F SENSOR 1 HEATER
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning part.
2.
CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between A/F sensor 1 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 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK A/F SENSOR 1 HEATER
EC-182, "Component Inspection"
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
4.
REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1. Refer to
.
CAUTION:
• Discard any A/F 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 A/F sensor, clean exhaust system threads.
>> INSPECTION END
Component Inspection
INFOID:0000000010775112
1.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
1.
Turn ignition switch OFF.
2.
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
3.
Check resistance between A/F sensor 1 terminals as per the following.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE A/F SENSOR 1
+
−
Continuity
A/F sensor 1
ECM
Connector Terminal
Connector Terminal
F27
3
F8
93
Existed
A/F sensor 1
Resistance
+
−
Terminal
3
4
1.80 - 2.44
Ω
[at 25
°
C
(77
°
F)]
1
Not exist
2
4
1
2
P0031, P0032 A/F SENSOR 1 HEATER
EC-183
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Replace malfunctioning A/F sensor 1. Refer to
.
CAUTION:
• Discard any A/F 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 A/F sensor, clean exhaust system threads.
>> INSPECTION END
EC-184
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
P0037, P0038 HO2S2 HEATER
P0037, P0038 HO2S2 HEATER
DTC Description
INFOID:0000000010775113
DTC DETECTION LOGIC
POSSIBLE CAUSE
P0037
• Harness or connectors (The heated oxygen sensor 2 heater circuit is open or shorted.)
• Heated oxygen sensor 2 heater
P0038
• Harness or connectors (The heated oxygen sensor 2 heater circuit is shorted.)
• Heated oxygen sensor 2 heater
FAIL-SAFE
Not applicable
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 11 to 16 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
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 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
.
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010775114
1.
CHECK HEATED OXYGEN SENSOR 2 (HO2S2) POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between HO2S2 harness connector and ground.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P0037
HO2S2 HTR (B1)
(HO2S heater control circuit low bank 1
sensor 2)
An excessively low voltage signal is sent to ECM through the heated oxy-
gen sensor 2 heater.
P0038
HO2S2 HTR (B1)
(HO2S heater control circuit high bank 1
sensor 2)
An excessively high voltage signal is sent to ECM through the heated oxy-
gen sensor 2 heater.
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