Infiniti Q45. Manual — part 385
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
EC-179
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D
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M
A
EC
5.
CHECK A/F SENSOR 1 HEATER
Refer to
EC-179, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning air fuel ratio sensor 1.
6.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Component Inspection
NBS002WW
AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Check resistance between terminals 3 and 4.
Check continuity between terminals 3 and 1, 2, 5, 6, terminals 4 and
1, 2, 5, 6.
If NG, replace the A/F sensor 1.
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 using Heated Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Removal and Installation
NBS002WX
AIR FUEL RATIO (A/F) SENSOR 1
Refer to
EM-23, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
Resistance: 2.3 - 4.3
Ω
[at 25
°
C (77
°
F)]
Continuity should not exist.
PBIB1684E
EC-180
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
PFP:226A0
Description
NBS001S7
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
CONSULT-II Reference Value in Data Monitor Mode
NBS001S8
Specification data are reference values.
On Board Diagnosis Logic
NBS001S9
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Engine speed
Heated oxygen sensor 2
heater control
Heated oxygen sensor 2 heater
Crankshaft position sensor (POS)
Engine coolant temperature sensor
Engine coolant temperature
Mass air flow sensor
Amount of intake air
Engine speed rpm
Heated oxygen sensor 2 heater
Above 3,600
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
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
●
Engine speed: 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
●
Engine speed: Above 3,600 rpm
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0037
0037
(Bank 1)
Heated oxygen sensor 2
heater control circuit low
The current amperage in the heated oxygen sensor
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.)
●
Heater oxygen sensor 2 heater
P0057
0057
(Bank 2)
P0038
0038
(Bank 1)
Heated oxygen sensor 2
heater control circuit high
The current amperage in the heated oxygen sensor
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.)
●
Heater oxygen sensor 2 heater
P0058
0058
(Bank 2)
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-181
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EC
DTC Confirmation Procedure
NBS001SA
NOTE:
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.
WITH CONSULT-II
1.
Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-II.
2.
Start the 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.
5.
Let engine idle for 1 minute.
6.
If 1st trip DTC is detected, go to
EC-185, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
SEF174Y
EC-182
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Wiring Diagram
NBS001SB
BANK 1
TBWM1221E
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