Infiniti FX35 / FX45. Manual — part 349
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
EC-157
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis Procedure
INFOID:0000000001325970
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten ground screw on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or Replace ground connections.
2.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
2.
Turn ignition switch ON.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
24
L
A/F sensor 1 heater
(bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 5V
57
G
A/F sensor 1 (Bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 2.6V
58
Y
Approximately 2.3V
76
P
Approximately 3.1V
77
BR
Approximately 2.3V
PBIB1584E
PBIB2625E
PBIB2190E
EC-158
< SERVICE INFORMATION >
[VQ35DE]
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
3.
Check voltage between air fuel ratio sensor 1 terminal 3 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E64, F65
• IPDM E/R harness connector E7
• 10A fuse
• Harness for open or short between air fuel ratio sensor 1 and fuse
>> Repair or replace harness or connectors.
4.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal 2 (bank 1) or 24 (bank 2) and air fuel ratio (A/F) sensor
1 terminal 4.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
EC-158, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace malfunctioning air fuel ratio (A/F) sensor 1.
6.
CHECK INTERMITTENT INCIDENT
Perform
>> INSPECTION END
Component Inspection
INFOID:0000000001325971
AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Voltage: Battery voltage
PBIB1683E
Continuity should exist.
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
EC-159
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 air fuel ratio (A/F) sensor 1.
CAUTION:
• Discard any air fuel ratio (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 air fuel ratio (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 lubri-
cant.
Removal and Installation
INFOID:0000000001325972
AIR FUEL RATIO (A/F) SENSOR 1
Resistance: 2.3 - 4.3
Ω
[at 25
°
C (77
°
F)]
Continuity should not exist.
PBIB1684E
EC-160
< SERVICE INFORMATION >
[VQ35DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Description
INFOID:0000000001325973
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-III Reference Value in Data Monitor Mode
INFOID:0000000001325974
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001325975
DTC Confirmation Procedure
INFOID:0000000001325976
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:
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 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 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
(Heated oxygen sensor 2 heater circuit is
open or shorted.)
• Heated 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 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
(Heated oxygen sensor 2 heater circuit is
shorted.)
• Heated oxygen sensor 2 heater
P0058
0058
(Bank 2)
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