Infiniti QX56 (JA60). Manual - part 360

EC-92

< COMPONENT DIAGNOSIS >

[VK56DE]

P0011, P0021 IVT CONTROL

4. Check voltage between intake valve timing control solenoid

valve terminal 2 and ground with CONSULT-III or tester.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness for open or short between intake valve timing control solenoid valve and IPDM E/R.

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

11.

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 the following;

ECM terminal 10 and intake valve timing control solenoid valve (Bank 1) terminal 1 or 

ECM terminal 11 and intake valve timing control solenoid valve (Bank 2) terminal 1.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power. 
OK or NG

OK

>> GO TO 12.

NG

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

12.

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Refer to 

EC-93, "Component Inspection"

.

OK or NG

OK

>> GO TO 13.

NG

>> Replace malfunctioning intake valve timing control solenoid valve. Refer to 

EC-494

.

13.

CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to 

EC-203, "Component Inspection"

.

OK or NG

OK

>> GO TO 14.

NG

>> Replace crankshaft position sensor (POS).

14.

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-207, "Component Inspection"

.

OK or NG

OK

>> GO TO 15.

NG

>> Replace malfunctioning camshaft position sensor (PHASE). Refer to 

EC-495

.

15.

CHECK CAMSHAFT SPROCKET

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

EM-62, "Inspec-

tion after Installation"

.

OK or NG

OK

>> GO TO 16.

Voltage: Battery voltage

PBIB0351E

Continuity should exist.

P0011, P0021 IVT CONTROL

EC-93

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NG

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

16.

CHECK TIMING CHAIN INSTALLATION

Check service records for any recent repairs that may cause timing chain misaligned.

Are there any service records that may cause timing chain misaligned?
Yes or No

Yes

>> Check timing chain installation. Refer to 

EM-45, "Removal and Installation"

.

No

>> GO TO 17.

17.

CHECK LUBRICATION CIRCUIT

Refer to 

EM-62, "Inspection after Installation"

.

OK or NG

OK

>> GO TO 18.

NG

>> Clean lubrication line.

18.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "How to Check Terminal"

 and 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005149094

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. Refer

to 

EC-495

.

INTAKE VALVE TIMING CONTROL SOLENOID VALVE

1. Disconnect intake valve timing control solenoid valve harness connector.

SEF362Z

Terminal No. (Polarity)

Resistance 

Ω [at 25°C (77°F)]

3 (+) - 1 (-)

Except 0 or 

∞

2 (+) - 1 (-)

3 (+) - 2 (-)

JMBIA0600ZZ

EC-94

< COMPONENT DIAGNOSIS >

[VK56DE]

P0011, P0021 IVT CONTROL

2. Check resistance between intake valve timing control solenoid

valve terminals as follows.

If NG, replace intake valve timing control solenoid valve. Refer to

EC-494

.

If OK, go to next step.

3. Remove intake valve timing control solenoid valve. Refer to 

EC-

494

.

4. Provide 12 V DC between intake valve timing control solenoid

valve terminals and then interrupt it. Make sure that the plunger

moves as shown in the figure.

CAUTION:

Do not apply 12 V DC continuously for 5 seconds or more.

Doing so may result in damage to the coil in intake valve

timing control solenoid valve.

If NG, replace intake valve timing control solenoid valve. Refer to

EC-494

.

NOTE:

Always replace O-ring when intake valve timing control

solenoid valve is removed.

Terminals

Resistance

1 and 2

7.1 - 7.7 

Ω [at 20°C (68°F)]

1 or 2 and ground

∞Ω

(Continuity should not exist)

MBIB0027E

PBIB2388E

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-95

< COMPONENT DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

Description

INFOID:0000000005149095

SYSTEM DESCRIPTION

The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating

condition to keep the temperature of A/F sensor 1 element at the specified range.

On Board Diagnosis Logic

INFOID:0000000005149096

DTC Confirmation Procedure

INFOID:0000000005149097

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at

idle.

1. Start engine and let it idle for at least 10 seconds.

2. Check 1st trip DTC.

3. If 1st trip DTC is detected, go to 

EC-95, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149098

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

2. Loosen and retighten three ground screws on the body.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)

Engine speed

Air fuel ratio (A/F) sensor 1 
heater control

Air fuel ratio (A/F) sensor 1 
heater

Mass air flow sensor

Amount of intake air

 DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0031
0031
(Bank 1)

Air fuel ratio (A/F) sensor 
1 heater control circuit low

The current amperage in the air fuel ratio (A/F) sen-
sor 1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the air fuel ratio (A/F) sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
open or shorted.)

• A/F sensor 1 heater

P0051
0051
(Bank 2)

P0032
0032
(Bank 1)

Air fuel ratio (A/F) sensor 
1 heater control circuit 
high

The current amperage in the air fuel ratio (A/F) sen-
sor 1 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the air fuel ratio (A/F) sensor 1 heater.)

• Harness or connectors

(The A/F sensor 1 heater circuit is 
shorted.)

• A/F sensor 1 heater

P0052
0052
(Bank 2)