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Nissan Frontier. Manual - part 512

U0101 CAN COMM CIRCUIT

EC-619

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

U0101 CAN COMM CIRCUIT

Description

INFOID:0000000009481244

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

INFOID:0000000009481245

*1: This self-diagnosis has the one trip detection logic (A/T)

DTC Confirmation Procedure

INFOID:0000000009481246

1. Turn ignition switch ON and wait at least 3 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to

EC-619, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000009481247

Go to

LAN-53, "CAN System Specification Chart"

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

U0101*

0101*

Lost communication
with TCM

• When ECM is not transmitting or receiving

CAN communication signal of OBD (emission-
related diagnosis) with TCM for 2 seconds or
more.

• CAN communication line between TCM

and ECM

• CAN communication line is open or short-

EC-620

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

U1001 CAN COMM CIRCUIT

U1001 CAN COMM CIRCUIT

Description

INFOID:0000000009481248

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

INFOID:0000000009481249

The MIL will not illuminate for this diagnosis.

DTC Confirmation Procedure

INFOID:0000000009481250

1. Turn ignition switch ON and wait at least 3 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to

EC-620, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000009481251

Go to

LAN-53, "CAN System Specification Chart"

DTC No.

Trouble diagnosis

name

DTC detecting condition

Possible cause

U1001
1001

CAN communication
line

• When ECM is not transmitting or receiving

CAN communication 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-621

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0011, P0021 IVT CONTROL

On Board Diagnosis Logic

INFOID:0000000009481252

FAIL-SAFE MODE

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

DTC Confirmation Procedure

INFOID:0000000009481253

CAUTION:

Always drive at a safe speed.

NOTE:

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

P0075 or P0081. Refer to

EC-630, "Component Description"

• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds 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 V and 16 V at

idle.

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 14 consecutive seconds. Hold the accelerator pedal as

steady as possible.

4. Stop vehicle with engine running and let engine idle for 10 seconds.
5. Check 1st trip DTC.
6. If the 1st trip DTC is detected, go to

EC-622, "Diagnosis Procedure"

If the 1st trip DTC is not detected, go to next step.

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

DTC No.

Trouble diagnosis

name

Detecting condition

Possible cause

P0011
0011
(Bank 1)

Intake valve timing
control performance

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 in-

take valve timing control

P0021
0021
(Bank 2)

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.

ENG SPEED

1,200 - 2,000 rpm

COOLAN TEMP/S

More than 60