Nissan Pathfinder. Manual — part 468

EC-178

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

U1001 CAN COMM CIRCUIT

U1001 CAN COMM CIRCUIT

Description

INFOID:0000000009178100

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.

DTC Logic

INFOID:0000000009178101

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Proceed to

EC-178, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178102

Perform the trouble diagnosis for CAN communication system. Refer to

LAN-20, "Trouble Diagnosis Flow

Chart"

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

U1001

CAN COMM CIRCUIT
(CAN COMM CIRCUIT)

When ECM is not transmitting or receiving CAN com-
munication signal other than OBD (emission related
diagnosis) for 2 seconds or more.

• Harness or connectors

(CAN communication line is open
or shorted)

P0011, P0021 IVT CONTROL

EC-179

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P0011, P0021 IVT CONTROL

DTC Logic

INFOID:0000000009178103

DTC DETECTION LOGIC

NOTE:

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

DTC P0075, P0081. Refer to

EC-189, "DTC Logic"

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next test.

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 V and 16 V at

idle.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.

2. Start engine and warm it up to the normal operating temperature.

3. Maintain the following conditions for at least 6 consecutive seconds. Hold the accelerator pedal as steady

as possible.

CAUTION:

Always drive at a safe speed.

4. Stop vehicle with engine running and let engine idle for 10 seconds.

5. Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?

YES

>> Proceed to

EC-180, "Diagnosis Procedure"

>> GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE-II

With CONSULT

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0011

INT/V TIM CONT-B1
(“A” Camshaft Position - Timing Over-Ad-
vanced or System Performance bank 1)

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

• Crankshaft position sensor (POS)
• Camshaft position sensor (PHASE)
• Intake valve timing control solenoid valve
• Accumulation of debris to the signal pick-up

portion of the camshaft

• Timing chain installation
• Foreign matter caught in the oil groove for

intake valve timing control

P0021

INT/V TIM CONT-B2
(“B” Camshaft Position - Timing Over-Ad-
vanced or System Performance bank 2)

ENG SPEED

1,200 - 2,000 rpm

COOLANT TEMP/S

More than 60

°C (140°F)

B/FUEL SCHDL

More than 7.3 msec

Selector lever

D position

EC-180

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P0011, P0021 IVT CONTROL

1. Maintain the following conditions for at least 20 consecutive seconds.

CAUTION:

Always drive at a safe speed.

2. Check 1st trip DTC.

With GST

Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?

YES

>> Proceed to

EC-180, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178104

CHECK OIL PRESSURE WARNING LAMP

1. Start engine.

2. Check oil pressure warning lamp and confirm it is not illumi-

nated.

Is oil pressure warming lamp illuminated?

YES

>> Check the engine oil level. Refer to

LU-8, "Inspection"

>> GO TO 2.

CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE

Check intake valve timing control solenoid valve. Refer to

EC-181, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 3.

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

EM-52, "Intake Valve

Timing Control Solenoid Valve (LH)"

EM-53, "Intake Valve Timing Control Solenoid Valve (RH)"

CHECK CRANKSHAFT POSITION SENSOR (POS)

Check crankshaft position sensor (POS). Refer to

EC-284, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 4.

>> Replace crankshaft position sensor (POS). Refer to

EM-37, "Removal and Installation (Upper Oil

Pan)"

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Check camshaft position sensor (PHASE). Refer to

EC-287, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 5.

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

EM-43, "Removal and Instal-

lation (LH)"

EM-44, "Removal and Installation (RH)"

CHECK CAMSHAFT (INTAKE)

Check the following.

ENG SPEED

1,200 - 3,175 rpm (A constant rotation is maintained.)

COOLANT TEMP/S

More than 60

°C (140°F)

Selector lever

1st or 2nd position

Driving location uphill

Driving vehicle uphill
(Increased engine load will help maintain the driving conditions re-
quired for this test.)

PBIA8559J

P0011, P0021 IVT CONTROL

EC-181

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• Accumulation of debris on the signal plate of camshaft rear end

• Chipping signal plate of camshaft rear end
Is the inspection result normal?

YES

>> GO TO 6.

>> Remove debris and clean the signal plate of camshaft

rear end or replace camshaft. Refer to

EM-75, "Removal

and Installation"

CHECK TIMING CHAIN INSTALLATION

Check service records for any recent repairs that may cause timing chain misalignment.
Are there any service records that may cause timing chain misalignment?

YES

>> Check timing chain installation. Refer to

EM-62, "Removal and Installation"

>> GO TO 7.

CHECK LUBRICATION CIRCUIT

Check lubrication circuit. Refer to

EM-83, "Inspection after Installation"

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-49, "Intermittent Incident"

>> Clean lubrication line.