Infiniti F50. Manual - part 378

DTC P0011, P0021 IVT CONTROL

EC-153

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EC

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M135, F105

●

Harness for open or short between intake valve timing control solenoid valve and ECM relay

>> Repair harness or connectors.

9. 

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR 

OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 152 (bank 1) and intake valve timing control solenoid
valve terminal 1, or ECM terminal 155 (bank 2) and intake valve timing control solenoid valve terminal 1.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power. 

OK or NG

OK

>> GO TO 10.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

10. 

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Refer to 

EC-154, "Component Inspection"

 .

OK or NG

OK

>> GO TO 11.

NG

>> Replace intake valve timing control solenoid valve.

11. 

CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to 

EC-314, "Component Inspection"

 .

OK or NG

OK

>> GO TO 12.

NG

>> Replace crankshaft position sensor (POS).

12. 

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-319, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace camshaft position sensor (PHASE).

13. 

CHECK CAMSHAFT

Check accumulation of debris to the signal pick-up portion of the camshaft. Refer to 

EM-46, "CAMSHAFT"

 .

OK or NG

OK

>> GO TO 14.

NG

>> Remove debris and clean the signal pick-up cutout of camshaft.

14. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

For wiring diagram, refer to 

EC-308

  for CKP sensor (POS), and 

EC-316

  for CMP sensor (PHASE).

>> INSPECTION END

Continuity should exist.

EC-154

DTC P0011, P0021 IVT CONTROL

Component Inspection

EBS00LWU

INTAKE VALVE TIMING CONTROL POSITION SENSOR

1.

Disconnect intake valve timing control position sensor harness connector.

2.

Loosen the fixing bolt of the sensor.

3.

Remove the sensor.

4.

Visually check the sensor for chipping.

5.

Check resistance as shown below.

6.

If NG, replace intake valve timing control position sensor.

INTAKE VALVE TIMING CONTROL SOLENOID VALVE

1.

Disconnect intake valve timing control solenoid valve harness connector.

2.

Check resistance between intake valve timing control solenoid
valve terminals as follows.

Removal and Installation

EBS00LWV

INTAKE VALVE TIMING CONTROL POSITION SENSOR

Refer to 

EM-35, "TIMING CHAIN"

 .

INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Refer to 

EM-35, "TIMING CHAIN"

 .

SEF362Z

Terminal No. (Polarity)

Resistance 

Ω

 [at 25

°

C (77

°

F)]

3 (+) - 1 (-)

Except 0 or 

∞

2 (+) - 1 (-)

3 (+) - 2 (-)

PBIB0194E

Terminals

Resistance

1 and 2

7.0 - 7.5

Ω

 at 20

°

C (68

°

F)

1 or 2 and ground

∞Ω

(Continuity should not exist)

PBIB0193E

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

EC-155

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EC

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

PFP:22690

Description

EBS00LWW

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

EBS00LWX

Specification data are reference values.

On Board Diagnosis Logic

EBS00LWY

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 3,600

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 rpm

ON

●

Engine speed: Above 3,600 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-156

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

DTC Confirmation Procedure

EBS00LWZ

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-160, "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 run it for at least 6 seconds at idle speed.

4.

Turn ignition switch “OFF” and wait at least 10 seconds.

5.

Start engine and run it for at least 6 seconds at idle speed.

6.

Select “MODE 3” with GST.

7.

If DTC is detected, go to 

EC-160, "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 diagnosis.
Therefore, using CONSULT-II is recommended.

SEF174Y