Infiniti F50. Manual - part 375

DTC U1000, U1001 CAN COMMUNICATION LINE

EC-141

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DTC U1000, U1001 CAN COMMUNICATION LINE

PFP:23710

Description

EBS00LWJ

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

EBS00LWK

*1: This self-diagnosis has the one trip detection logic.
*2: The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

EBS00LWL

1.

Turn ignition switch “ON” and wait at least 3 seconds.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If 1st trip DTC is detected, go to 

EC-143, "Diagnostic Procedure"

 .

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U1000*

1

1000*

1

CAN communication line

●

ECM cannot communicate to other control units.

●

ECM cannot communicate for more than the 
specified time.

●

Harness or connectors
(CAN communication line is open or 
shorted)

U1001*

2

1001*

2

EC-142

DTC U1000, U1001 CAN COMMUNICATION LINE

Wiring Diagram

EBS00LWM

TBWM0055E

DTC U1000, U1001 CAN COMMUNICATION LINE

EC-143

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Diagnostic Procedure

EBS00LWN

1. 

INSPECTION START

1.

Turn ignition switch “ON”.

2.

Select “CAN DIAG SUPPORT MNTR” in “DATA MONITOR” mode with CONSULT-II.

3.

Print out the CONSULT-II screen.
Models without ICC

Models with ICC

>> Go to 

LAN-24, "CAN SYSTEM (FOR VDC MODELS)"

    or 

LAN-40, "CAN SYSTEM (FOR ICC

MODELS)"

 .

PBIB1145E

PBIB1146E

EC-144

DTC P0011, P0021 IVT CONTROL

DTC P0011, P0021 IVT CONTROL

PFP:23796

Description

EBS00LWO

If DTC P1110 or P1135 is displayed with DTC P1111, P1136, P1140 or P1145, first perform the trouble
diagnosis for 

EC-424, "DTC P1111, P1136 IVT CONTROL SOLENOID VALVE"

  or 

EC-455, "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