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Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check ABS Actuator And Electric Unit (Control Unit) Ignition Power Supply 
    1. Turn The Ignition Switch Off.
    2. Disconnect ABS Actuator And Electric Unit (Control Unit) Harness Connectors.
    3. Check The Voltage Between ABS Actuator And Electric Unit (Control Unit) Harness Connectors And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      E125

      18

      Ground

      0 V
    4. Turn The Ignition Switch On
      NOTE: Start The Engine.
    5. Check The Voltage Between ABS Actuator And Electric Unit (Control Unit) Harness Connectors And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      E125

      18

      Ground

      Battery Voltage

    Is The Inspection Result Normal?

    Yes

    GO TO STEP 3  .

    No

    GO TO STEP 2  .

  2. Check ABS Actuator And Electric Unit (Control Unit) Ignition Power Supply Circuit 
    1. Turn The Ignition Switch Off.
    2. Check The 10 A Fuse (46).
    3. Disconnect IPDM E/R Harness Connector.
    4. Check The Continuity Between ABS Actuator And Electric Unit (Control Unit) Harness Connector And IPDM E/R.

      ABS Actuator And Electric Unit (Control Unit)

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E125

      18

      E119

      15

      Yes
    5. Check The Continuity Between ABS Actuator And Electric Unit (Control Unit) Harness Connectors And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Continuity

      Connector

      Terminal

      E125

      18

      Ground

      No

    Is The Inspection Result Normal?

    Yes

    Perform Trouble Diagnosis For Ignition Power Supply.

    No

    Repair / Replace Harness, Connector, Or Fuse.

  3. Check Motor And Motor Relay Power Supply 
    1. Turn The Ignition Switch Off.
    2. Check The Voltage Between ABS Actuator And Electric Unit (Control Unit) Harness Connectors And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      E125

      4

      Ground

      Battery Voltage

      E133

      47
    3. Turn The Ignition Switch On.
      NOTE: Start The Engine.
    4. Check The Voltage Between ABS Actuator And Electric Unit (Control Unit) Harness Connectors And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      E125

      4

      Ground

      Battery Voltage

      E133

      47

    Is The Inspection Result Normal?

    Yes

    GO TO STEP 5  .

    No

    GO TO STEP 4  .

  4. Check Motor And Motor Relay Power Supply Circuit 
    1. Turn The Ignition Switch Off.
    2. Check The 50 A Fusible Link (K).
    3. Check The Continuity And Short Circuit Between ABS Actuator And Electric Unit (Control Unit) Harness Connector Terminals 4 And 47 And 50 A Fusible Link (K).

    Is The Inspection Result Normal?

    Yes

    Perform Trouble Diagnosis For Battery Power Supply.

    No

    Repair / Replace Harness, Connector, Or Fusible Link.

  5. Check Actuator Relay, ABS In Valve, ABS Out Valve Power Supply 
    1. Turn The Ignition Switch Off.
    2. Check The Voltage Between ABS Actuator And Electric Unit (Control Unit) Harness Connector And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      E125

      1

      Ground

      Battery Voltage
    3. Turn The Ignition Switch On
      NOTE: Start The Engine.
    4. Check The Voltage Between ABS Actuator And Electric Unit (Control Unit) Harness Connector And Ground.

      ABS Actuator And Electric Unit (Control Unit)

      -

      Voltage

      (Approx.)

      Connector

      Terminal

      E125

      1

      Ground

      Battery Voltage

    Is The Inspection Result Normal?

    Yes

    GO TO STEP 7  .

    No

    GO TO STEP 6  .

  6. Check Actuator Relay, ABS In Valve, ABS Out Valve Power Supply Circuit 
    1. Turn The Ignition Switch Off.
    2. Check The 30 A Fusible Link (M).
    3. Check The Continuity And Short Circuit Between ABS Actuator And Electric Unit (Control Unit) Harness Connector Terminal 1 And 30 A Fusible Link (M).

    Is The Inspection Result Normal?

    Yes

    Perform Trouble Diagnosis For Battery Power Supply.

    No

    Repair / Replace Harness, Connector, Or Fusible Link.

  7. Check ABS Actuator And Electric Unit (Control Unit) Ground Circuit 

    Check The Continuity Between ABS Actuator And Electric Unit (Control Unit) Harness Connector And The Ground.

    ABS Actuator And Electric Unit (Control Unit)

    -

    Continuity

    Connector

    Terminal

    E125

    2

    Ground

    Yes

    3

    E133

    48

    Is The Inspection Result Normal?

    Yes

    GO TO STEP 8  .

    No

    Repair / Replace Harness, Connector, Or Terminal.

  8. Check Terminal 
    1. Check The ABS Actuator And Electric Unit (Control Unit) Pin Terminals For Damage Or Loose Connection With Harness Connector.
    2. Check The IPDM E/R Pin Terminals For Damage Or Loose Connection With Harness Connector.

    Is The Inspection Result Normal?

    Yes

    Replace The ABS Actuator And Electric Unit (Control Unit). Refer To Removal And Installation .

    No

    Repair / Replace Harness, Connector, Or Terminal.

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