Infiniti M45 (Y34). Manual — part 367
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-157
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EC
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
PFP:22690
Description
ABS002EK
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 1 heater corresponding to the engine speed
and engine coolant temperature. The duty percent varies with engine coolant temperature when engine is
started.
OPERATION
CONSULT-II Reference Value in Data Monitor Mode
ABS002EL
Specification data are reference values.
On Board Diagnosis Logic
ABS002EM
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
Engine speed
Heated oxygen sensor 1
heater control
Heated oxygen sensor 1 heater
Engine coolant temperature sensor
Engine coolant temperature
Engine speed rpm
Heated oxygen sensor 1 heater
Above 3,000
OFF
Below 3,000 after warming up
ON
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
●
Engine: After warming up
●
Engine speed: Below 3,000 rpm
ON
●
Engine speed: Above 3,000 rpm
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0031
0031
(Bank 1)
Heated oxygen sensor 1
heater control circuit low
The current amperage in the heated oxygen sensor
1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 1 heater.)
●
Harness or connectors
(The heated oxygen sensor 1 heater
circuit is open or shorted.)
●
Heater oxygen sensor 1 heater
P0051
0051
(Bank 2)
P0032
0032
(Bank 1)
Heated oxygen sensor 1
heater control circuit high
The current amperage in the heated oxygen sensor
1 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 1 heater.)
●
Harness or connectors
(The heated oxygen sensor 1 heater
circuit is shorted.)
●
Heater oxygen sensor 1 heater
P0052
0052
(Bank 2)
EC-158
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
DTC Confirmation Procedure
ABS002EN
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.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
4.
Start engine and let it idle for at least 6 seconds.
5.
If 1st trip DTC is detected, go to
EC-162, "Diagnostic Procedure"
.
WITH GST
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and let it idle for at least 6 seconds.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Start engine and let it idle for at least 6 seconds.
6.
Select “MODE 3” with GST.
7.
If DTC is detected, go to
EC-162, "Diagnostic Procedure"
.
●
When using GST, DTC Confirmation Procedure should be performed twice as much as when
using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagno-
sis. Therefore, using CONSULT-II is recommended.
SEF174Y
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-159
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EC
Wiring Diagram
ABS002EO
BANK 1
TBWA0267E
EC-160
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
8
BR
Heated oxygen sensor 1
heater (bank 1)
[Engine is running]
●
Warm-up condition
●
Engine speed: Below 3,000 rpm.
Approximately 7V
[Engine is running]
●
Engine speed: Above 3,000 rpm.
BATTERY VOLTAGE
(11 - 14V)
PBIB0519E
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