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Nissan Sentra B18 (2020-2025) Service Manual: Dtc/circuit Diagnosis

B120e-04 Ipdm E/r

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detection condition

B120E-04

IPDM E/R

(Intelligent power distribution module engine room)

[SYSTEM INTERNAL MALFUNCTN]

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

EEPROM in IPDM E/R is malfunctioning

Diagnosis delay time

1 second or more

POSSIBLE CAUSE

IPDM E/R

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Select “Self Diagnostic Result” mode of “IPDM E/R”.

    Is DTC 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. REPLACE IPDM E/R

    1. Replace IPDM E/R. Refer to Removal and Installation.

    NO >>

    Inspection End.

B120e-55 Ipdm E/r

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detection condition

B120E-55

IPDM E/R

(Intelligent power distribution module engine room)

[NOT CONFIGURED]

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Configuration is not performed

Diagnosis delay time

1 second or more

POSSIBLE CAUSE

  • Configuration is not performed.

  • IPDM E/R

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Select “Self Diagnostic Result” mode of “IPDM E/R”.

    Is DTC 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 CONFIGURATION (IPDM E/R)

    1. CONSULT

      1. Perform configuration (IPDM E/R). Refer to Work Procedure.

      2. Perform DTC confirmation procedure. Refer to DTC Confirmation Procedure.

    Is DTC detected?

    YES >>

    Replace IPDM E/R. Refer to Removal and Installation.

    NO >>

    Inspection End.

B20dd-73 Ign Relay on Circ

Dtc Description

DTC Description

  • The IPDM E/R operates the ignition relay-1 when it receives an ignition switch ON signal from the BCM via CAN communication.

  • Turn the ignition relay-1 OFF by pressing the push-button ignition switch once when the Nissan Sentra vehicle speed is 2.5 MPH (4 km/h) or less.

  • Turn the ignition relay-1 OFF with the following operation when the Nissan Sentra vehicle speed is more than 2.5 MPH (4 km/h) or when an abnormal condition occurs in CAN communication from the combination meter (emergency OFF):

    • Press and hold the push-button ignition switch for 2 seconds or more.

    • Press the push-button ignition switch 3 times within 1.5 seconds.

Note:

The ignition relay-1 does not turn ON for 3 seconds after emergency OFF even if the push-button ignition switch is pressed.

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detection condition

B20DD-73

IGN RELAY ON CIRC

(Ignition relay on circuit)

[ACTUATOR STUCK CLOSED]

Diagnosis condition

When ignition switch is OFF

Signal (terminal)

CPU monitors the status at the contact and excitation coil circuits of the ignition relay-1 inside it

Threshold

The ignition relay-1 ON is detected

Diagnosis delay time

1 second or more

POSSIBLE CAUSE

IPDM E/R

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Ignition switch OFF and wait for 1 second or more.

      3. Ignition switch ON.

      4. Select “Self Diagnostic Result” mode of “IPDM E/R”.

    Is DTC 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. CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 1

    1. CONSULT

      1. Ignition switch ON

      2. Select “Self Diagnostic Result” mode of “IPDM E/R”.

      3. Remove fuse [No. 88 (10A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.

    Is it now a past malfunction?

    YES >>

    Perform an inspection of the downstream circuit of fuse [No. 88 (10A)] in the IPDM E/R.

    NO >>

    GO TO 2.

  2. CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 2

    1. CONSULT

      1. Return fuse [No. 88 (10A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position.

      2. Remove fuse [No. 87 (10A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.

    Is it now a past malfunction?

    YES >>

    Perform an inspection of the downstream circuit of fuse [No. 87 (10A)] in the IPDM E/R.

    NO >>

    GO TO 3.

  3. CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 3

    1. CONSULT

      1. Return fuse [No. 87 (10A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position

      2. Remove fuse [No. 89 (10A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.

    Is it now a past malfunction?

    YES >>

    Perform an inspection of the downstream circuit of fuse [No. 89 (10A)] in the IPDM E/R.

    NO >>

    GO TO 4.

  4. CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 4

    1. CONSULT

      1. Return fuse [No. 89 (10A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position

      2. Remove fuse [No. 91 (5A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.

    Is it now a past malfunction?

    YES >>

    Perform an inspection of the downstream circuit of fuse [No. 91 (5A)] in the IPDM E/R.

    NO >>

    GO TO 5.

  5. CHECK IGNITION RELAY-1 POWER SUPPLY CIRCUIT 5

    1. CONSULT

      1. Return fuse [No. 91 (5A)] downstream of the ignition relay-1 in the IPDM E/R back to the original position

      2. Remove fuse [No. 79 (20A)] downstream of the ignition relay-1 in the IPDM E/R, and check the change in “Self Diagnostic Result”.

    Is it now a past malfunction?

    YES >>

    Perform an inspection of the downstream circuit of fuse [No. 79 (20A)] in the IPDM E/R.

    NO >>

    Replace IPDM E/R. Refer to Removal and Installation.

B20de-72 Ign Relay Off Circ

Dtc Description

DTC Description

  • The IPDM E/R operates the ignition relay-1 when it receives an ignition switch ON signal from the BCM via CAN communication.

  • Turn the ignition relay-1 OFF by pressing the push-button ignition switch once when the Nissan Sentra vehicle speed is 2.5 MPH (4 km/h) or less.

  • Turn the ignition relay-1 OFF with the following operation when the Nissan Sentra vehicle speed is more than 2.5 MPH (4 km/h) or when an abnormal condition occurs in CAN communication from the combination meter (emergency OFF):

    • Press and hold the push-button ignition switch for 2 seconds or more.

    • Press the push-button ignition switch 3 times within 1.5 seconds.

Note:

The ignition relay-1 does not turn ON for 3 seconds after emergency OFF even if the push-button ignition switch is pressed.

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detection condition

B20DE-72

IGN RELAY OFF CIRC

(Ignition relay OFF circuit)

[ACTUATOR STUCK OPEN]

Diagnosis condition

When ignition switch is ON

Signal (terminal)

CPU monitors the status at the contact and excitation coil circuits of the ignition relay-1 inside it

Threshold

The ignition relay-1 OFF is detected

Diagnosis delay time

1 second or more

POSSIBLE CAUSE

IPDM E/R

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Select “Self Diagnostic Result” mode of “IPDM E/R”.

    Is DTC 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. REPLACE IPDM E/R

    1. Replace IPDM E/R. Refer to Removal and Installation.

    >>

    Inspection End.

U0073-00 Control Module Comm Bus a Off

Dtc Description

DTC Description

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Sentra vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Sentra vehicle is equipped with many electronic control unit, 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-High line, CAN-Low line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detection condition

U0073-00

Control module comm Bus A Off

(Control module communication bus A off)

[NO SUBTYPE INFO]

Diagnosis condition

When ignition switch is ON

Signal (terminal)

CAN communication signal

Threshold

When IPDM E/R cannot communicate CAN communication signal

Diagnosis delay time

2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

When CAN communication with the ECM and BCM is impossible, the IPDM E/R performs fail-safe control. After CAN communication recovers normally, it also returns to normal control.

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON and wait for 2 seconds or more.

      2. Select “Self Diagnostic Result” mode of “IPDM E/R”.

    Is DTC 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. CHECK CAN COMMUNICATION SYSTEM

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

    >>

    Inspection End.

Power Supply and Ground Circuit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE AND FUSIBLE LINKS

    1. Check that the following IPDM E/R fuse or fusible links are not blown:

      Terminal

      Signal name

      Fuse and fusible link No.

      Capacity

      1

      Battery power supply

      D

      80 A

      2

      E

      80 A

      81

      B

      300 A

      70

      40 A

    Is the fuse or fusible link blown?

    YES >>

    Replace the blown fuse or fusible link after repairing the affected circuit.

    NO >>

    GO TO 2

  2. CHECK POWER SUPPLY CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect IPDM E/R connectors.

      3. Check voltage between IPDM E/R harness connectors and ground.

        IPDM E/R

        —

        Voltage

        (Approx.)

        Connector

        Terminal

        E42

        1

        Ground

        Battery voltage

        2

        F97

        81

    Is the inspection result normal?

    YES >>

    GO TO 3

    NO >>

    Repair harness or connectors.

  3. CHECK GROUND CIRCUIT

      1. Disconnect IPDM E/R connectors.

      2. Check continuity between IPDM E/R harness connectors and ground.

      IPDM E/R

      —

      Continuity

      Connector

      Terminal

      E47

      12

      Ground

      Yes

      E43

      31

      E45

      47

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    Repair harness or connectors.

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