Infiniti FX35 / FX45. Manual - part 491

DTC U1000, U1001 CAN COMMUNICATION LINE

EC-725

< SERVICE INFORMATION >

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Wiring Diagram

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Diagnosis Procedure

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Go to 

LAN-43, "CAN System Specification Chart"

.

TBWM1322E

EC-726

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DTC U1010 CAN COMMUNICATION

DTC U1010 CAN COMMUNICATION

Description

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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

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This self-diagnosis has the one trip detection logic.

DTC Confirmation Procedure

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1.

Turn ignition switch ON.

2.

Check DTC.

3.

If DTC is detected, go to 

EC-726, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

INSPECTION START

 With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-726, "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-726, "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-187, "ECM Re-Communicating Function"

.

3.

Perform 

EC-662, "VIN Registration"

.

4.

Perform 

EC-662, "Accelerator Pedal Released Position Learning"

.

5.

Perform 

EC-663, "Throttle Valve Closed Position Learning"

.

6.

Perform 

EC-663, "Idle Air Volume Learning"

.

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U1010
1010

CAN communication bus

When detecting error during the initial diagno-
sis of CAN controller of ECM.

• ECM

DTC P0011, P0021 IVT CONTROL

EC-727

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DTC P0011, P0021 IVT CONTROL

Description

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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 DESCRIPTION

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.

Intake Valve Timing Control Position Sensor

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*

PBIB3276E

PBIB1842E

EC-728

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DTC P0011, P0021 IVT CONTROL

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 camshaft sprocket con-
cave (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-III Reference Value in Data Monitor Mode

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Specification data are reference values.

On Board Diagnosis Logic

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FAIL-SAFE MODE

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

DTC Confirmation Procedure

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CAUTION:

Always drive at a safe speed.
NOTE:
• If DTC P0011 or P0021 is displayed with DTC P0075, P0081, P1140 or P1145, first perform the trouble

diagnosis for 

EC-754

 or 

EC-1019

.

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