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Nissan Sentra B18 (2020-2025) Service Manual: U1000 Can Comm Circuit

Av Control Unit

Dtc Description

DTC Description

DESCRIPTION

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

CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

U1000–01

CAN COMM CIRCUIT

(CAN COMM CIRCUIT)

Diagnosis condition

When ignition switch is ON.

Signal (terminal)

—

Threshold

—

Diagnosis delay time

—

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

Function of CAN communication signals received by AV control unit are inoperative

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Ignition switch OFF and wait at least 30 seconds.

      3. Ignition switch ON and wait at least 30 seconds or more.

      4. Select “Self Diagnostic Result” mode of “MULTI AV”.

      5. Check DTC.

    Is DTC U1000–01 detected?

    YES>>

    Refer to DTC Diagnosis Procedure.

    NO>>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO>>

    Confirmation after repair: Inspection End.

Diagnosis Procedure

Diagnosis Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE AGAIN

    1. CONSULT

      1. Ignition switch ON.

      2. Erase DTC.

      3. Perform DTC confirmation procedure again. Refer to DTC Confirmation Procedure.

    Is DTC detected again?

    YES>>

    Perform the trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

    NO>>

    Inspection End.

Bose Speaker Amp.

Dtc Description

DTC Description

DESCRIPTION

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

CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

U1000–01

CAN COMM CIRCUIT

(CAN COMM CIRCUIT)

Diagnosis condition

When ignition switch is ON.

Signal (terminal)

—

Threshold

—

Diagnosis delay time

—

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

The system using the CAN communication signal from control unit which cannot communicate does not function

Confirmation Procedure

Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Ignition switch OFF and wait at least 30 seconds.

      3. Ignition switch ON and wait at least 30 seconds or more.

      4. Select “Self Diagnostic Result” mode of “AUDIO AMP.”.

      5. Check DTC.

    Is DTC U1000–01 detected?

    YES>>

    Refer to DTC Diagnosis Procedure.

    NO>>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO>>

    Confirmation after repair: Inspection End

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE AGAIN

    1. CONSULT

      1. Ignition switch ON.

      2. Erase DTC.

      3. Perform DTC confirmation procedure again. Refer to DTC Confirmation Procedure.

    Is DTC detected again?

    YES>>

    Perform the trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

    NO>>

    Inspection End.

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