Page 1489 of 4449
EC-148
[VQ35DE]
DTC P0011, P0021 IVT CONTROL
Revision: 2004 November 2004 FX35/FX45
Diagnostic ProcedureABS006LI
1. CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to EC-307, "
Component Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Replace crankshaft position sensor (POS).
2. CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to EC-315, "
Component Inspection" .
OK or NG
OK >> GO TO 3.
NG >> Replace camshaft position sensor (PHASE).
3. CHECK CAMSHAFT (INTAKE)
Check the following.
Accumulation of debris to the signal plate of camshaft rear end
Chipping signal plate of camshaft rear end
OK or NG
OK >> GO TO 4.
NG >> Remove debris and clean the signal plate of camshaft
rear end or replace camshaft.
4. CHECK INTERMITTENT INCIDENT
Refer to EC-135, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
For wiring diagram, refer to EC-303
for CKP sensor (POS), EC-309 and EC-311 for CMP sensor (PHASE).
>>INSPECTION END
SEC905C
Page 1490 of 4449
![INFINITI FX35 2004 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-149
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
DTC P0031, P0032, P0051, P0052 HO2S1 HEATERPFP:22690
DescriptionABS006LJ
SY INFINITI FX35 2004 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-149
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
DTC P0031, P0032, P0051, P0052 HO2S1 HEATERPFP:22690
DescriptionABS006LJ
SY](/manual-img/42/57021/w960_57021-1489.png)
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-149
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
DTC P0031, P0032, P0051, P0052 HO2S1 HEATERPFP:22690
DescriptionABS006LJ
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 ModeABS006LK
Specification data are reference values.
On Board Diagnosis LogicABS006LL
Sensor Input signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)Engine speed
Heated oxygen sensor 1
heater controlHeated oxygen sensor 1 heater
Engine coolant temperature sensor Engine coolant temperature
Engine speed rpm Heated oxygen sensor 1 heater
Above 3,600 OFF
Below 3,600 after warming up ON
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
Engine: After warming up
Engine speed: Below 3,600 rpmON
Engine speed: Above 3,600 rpm OFF
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P0031
0031
(Bank 1)Heated oxygen
sensor 1 heater
control circuit lowThe 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 highThe 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)
Page 1491 of 4449
EC-150
[VQ35DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2004 November 2004 FX35/FX45
DTC Confirmation ProcedureABS006LM
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 run it for at least 6 seconds at idle speed.
5. If 1st trip DTC is detected, go to EC-154, "
Diagnostic Procedure"
.
WITH GST
Follow the procedure “with CONSULT-II” above.
SEF058Y
Page 1492 of 4449
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-151
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
Wiring DiagramABS006LN
BANK 1
TBWM0283E
Page 1493 of 4449
EC-152
[VQ35DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2004 November 2004 FX35/FX45
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
COLORITEM CONDITION DATA (DC Voltage)
24 LHeated oxygen sensor 1
heater (bank 1)[Engine is running]
Warm-up condition
Engine speed is below 3,600 rpmApproximately 8V
[Engine is running]
Engine speed is above 3,600 rpmBATTERY VOLTAGE
(11 - 14V)
PBIB0519E
Page 1494 of 4449
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-153
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
BANK 2
TBWM0284E
Page 1495 of 4449
![INFINITI FX35 2004 Service Manual EC-154
[VQ35DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
Pulse sign INFINITI FX35 2004 Service Manual EC-154
[VQ35DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
Pulse sign](/manual-img/42/57021/w960_57021-1494.png)
EC-154
[VQ35DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2004 November 2004 FX35/FX45
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.)
Diagnostic ProcedureABS006LO
1. CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body. Refer to EC-141, "
Ground Inspection" .
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
2LHeated oxygen sensor 1
heater (bank 2)[Engine is running]
Warm-up condition
Engine speed is below 3,600 rpmApproximately 8V
[Engine is running]
Engine speed is above 3,600 rpmBATTERY VOLTAGE
(11 - 14V)
PBIB0519E
PBIB2195E
Page 1496 of 4449
![INFINITI FX35 2004 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-155
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 1 ha INFINITI FX35 2004 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-155
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 1 ha](/manual-img/42/57021/w960_57021-1495.png)
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-155
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: 2004 November 2004 FX35/FX45
2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 1 harness connector.
2. Turn ignition switch ON.
3. Check voltage between HO2S1 terminal 2 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E18, F48
Fuse block (J/B) connector E201
10A fuse
Harness for open or short between heated oxygen sensor 1 and fuse
>> Repair harness or connectors.
4. CHECK HO2S1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
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.Voltage: Battery voltage
PBIB1559E
PBIB0969E
DTCTe r m i n a l s
Bank
ECM Sensor
P0031, P0032 24 3 1
P0051, P0052 2 3 2
Continuity should exist.