Infiniti Q45. Manual - part 380

DTC U1010 CAN COMMUNICATION

EC-159

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EC

DTC U1010 CAN COMMUNICATION

PFP:23710

Description

NBS002WM

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

NBS002WN

This self-diagnosis has the one trip detection logic.

DTC Confirmation Procedure

NBS002WO

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If DTC is detected, go to 

EC-160, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U1010
1010

CAN communication bus

Initializing CAN communication bus is mal-
functioning.

●

ECM

SEF058Y

EC-160

DTC U1010 CAN COMMUNICATION

Diagnostic Procedure

NBS002WP

1. 

INSPECTION START

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode with CONSULT-II.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-159, "DTC Confirmation Procedure"

 .

5.

Is the DTC U1010 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-159, "DTC Confirmation Procedure"

 .

4.

Is the DTC U1010 displayed again?

Yes or No

Yes

>> GO TO 2.

No

>> INSPECTION END

2. 

REPLACE ECM

1.

Replace ECM.

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-202, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-77, "VIN Registration"

 .

4.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-78, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-78, "Idle Air Volume Learning"

 .

>> INSPECTION END

DTC P0011, P0021 IVT CONTROL

EC-161

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EC

DTC P0011, P0021 IVT CONTROL

PFP:23796

Description

NBS001RR

If DTC P0011 or P0021 is displayed with DTC P0075, P0081, P1140 or P1145, first perform the trouble
diagnosis for 

EC-188, "DTC P0075, P0081 IVT CONTROL SOLENOID VALVE"

  or 

EC-502, "DTC P1140,

P1145 IVT CONTROL POSITION SENSOR"

 .

SYSTEM DESCRIPTION

*: This signal is sent to the ECM through CAN communication line.

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control sole-
noid valve depending on driving status. This makes it possible to control the shut/open timing of the intake
valve to increase engine torque in low/mid speed range and output in high-speed range.

COMPONENT INSPECTION
Intake Valve Timing Control Solenoid Valve

Intake Valve Timing (IVT) control solenoid valve is activated by ON/
OFF pulse duty (ratio) signals from the ECM.
The IVT control solenoid valve changes the oil amount and direction
of flow through intake valve timing control unit or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.

Sensor

Input signal to ECM function

ECM

Actuator

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

Engine speed

Intake valve 
timing control

Intake valve timing control 
solenoid valve

Intake valve timing control position sensor

Intake valve timing signal

Engine coolant temperature sensor

Engine coolant temperature

Wheel sensor

Vehicle speed*

PBIB1102E

PBIB1842E

EC-162

DTC P0011, P0021 IVT CONTROL

Intake Valve Timing Control Position Sensor

Intake valve timing control position sensors are located in the front of
cylinder heads in both bank 1 and bank 2.
This sensor uses a Hall IC.
The cam position is determined by the intake primary cam sprocket
concave (in three places). The ECM provides feedback to the intake
valve timing control for appropriate target valve open-close timing
according to drive conditions based on detected cam position.

CONSULT-II Reference Value in Data Monitor Mode

NBS001RS

Specification data are reference values.

On Board Diagnosis Logic

NBS001RT

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode.

SEF359Z

MONITOR ITEM

CONDITION

SPECIFICATION

INT/V TIM (B1)
INT/V TIM (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

−

5

°

 - 5

°

CA

2,000 rpm

Approx. 0

°

 - 20

°

CA

INT/V SOL (B1)
INT/V SOL (B2)

●

Engine: After warming up

●

Selector lever: P or N

●

Air conditioner switch: OFF

●

No load

Idle

0% - 2%

2,000 rpm

Approx. 25% - 50%

DTC No.

Trouble diagnosis name

Detecting condition

Possible cause

P0011
0011
(Bank 1)

Intake valve timing control 
performance

A

The alignment of the intake valve timing 
control has been misresistered.

●

Harness or connectors
(Intake valve timing control solenoid 
valve circuit is open or shorted.)

●

Harness or connectors
(Intake valve timing control position 
sensor circuit is open or shorted.)

●

Intake valve timing control solenoid 
valve

●

Intake valve timing control position 
sensor

●

Crankshaft position sensor (POS)

●

Camshaft position sensor (PHASE)

●

Accumulation of debris to the signal 
pick-up portion of the camshaft 
sprocket

●

Timing chain installation

●

Foreign matter caught in the oil 
groove for intake valve timing control

P0021
0021
(Bank 2)

B

There is a gap between angle of target 
and phase-control angle degree.

Detected items

Engine operating condition in fail-safe mode

Intake valve timing control

The signal is not energized to the solenoid valve and the valve control does not function