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Present Error - Open Circuit -

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Identify the error circuit using information from the "SELECT SYSTEM" and "CAN DIAG SUPPORT MNTR" screens.

  1. SELECT SYSTEM: Check the items indicated in "SELECT SYSTEM". Draw a line on the diagnosis sheet to indicate the error circuit.
    NOTE: CAN communication line has no error if units other than Diag on CAN units are indicated. An error may be on the power supply of the control unit, DDL1 line or DDL2 line.
    1. "TRANSMISSION" which is Diag on CAN unit, is not indicated on "SELECT SYSTEM" screen. This indicates that DLC is not receiving a signal from TCM. Draw a line to indicate an error between DLC and TCM (line 1-a in the figure).
      NOTE:
      • Diag on CAN units are not indicated on the "SELECT SYSTEM" screen when the CAN line between Diag on CAN unit and the data link connector is open.
      • For a description of Diag on CAN, refer to "DIAG ON CAN ".
        Fig 1: Identifying Present Error Example - Open Circuit (1 Of 6)
        G04903983Courtesy of NISSAN NORTH AMERICA, INC.
  2. CAN DIAG SUPPORT MNTR: Check each item on "CAN DIAG SUPPORT MNTR". Draw a line on the diagnosis sheet to indicate the error circuit.
    1. Reception item of "ENGINE": On "TCM", "UNKWN" is indicated. This means ECM cannot receive the signal from TCM. Draw a line to indicate an error between ECM and TCM (line 2-a in the figure).
      NOTE: If "UNKWN" is indicated on "TRANSMIT DIAG", then the control unit cannot transmit CAN communication signal to each unit. Draw a line between the control unit and the splice.
    2. Reception item of "ADAPTIVE LIGHT": On "TCM", "UNKWN" is indicated. This means AFS cannot receive the signal from TCM. Draw a line to indicate an error between AFS and TCM (line 2-b in the figure).
    3. Reception item of "MULTI AV": "UNKWN" is not indicated. This indicates normal communication between AV and its receiving units. Do not draw any line.
      Fig 2: Identifying Present Error Example - Open Circuit (2 Of 6)
      G04903984Courtesy of NISSAN NORTH AMERICA, INC.
    4. Reception item of "BCM": On "TCM", "UNKWN" is indicated. This means BCM cannot receive the signal from TCM. Draw a line to indicate an error between BCM and TCM (line 2-d in the figure).
    5. Reception item of "EPS" and "INTELLIGENT KEY": "UNKWN" is not indicated. This indicates normal communication between EPS and I-KEY and their receiving units. Do not draw any line.
      NOTE: On CAN DIAG SUPPORT MNTR (without PAST), "UNKWN" is indicated even though the item is not used in the trouble diagnosis. For the details of each item on CAN diagnostic support monitor, refer to "CAN DIAGNOSTIC SUPPORT MONITOR ".
      Fig 3: Identifying Present Error Example - Open Circuit (3 Of 6)
      G04903985Courtesy of NISSAN NORTH AMERICA, INC.
    6. Reception item of "METER": On "TCM", "UNKWN" is indicated. This means M&A cannot receive the signal from TCM. Draw a line to indicate an error between M&A and TCM (line 2-f in the figure).
    7. Reception item of "AUTO DRIVE POS.": On "TCM", "UNKWN" is indicated. This means ADP cannot receive the signal from TCM. Draw a line to indicate an error between ADP and TCM (line 2-g in the figure).
    8. Reception item of "ABS": "UNKWN" is not indicated. This indicates normal communication between ABS and its receiving units. Do not draw any line.
      Fig 4: Identifying Present Error Example - Open Circuit (4 Of 6)
      G04903986Courtesy of NISSAN NORTH AMERICA, INC.
    9. Reception item of "IPDM E/R": "UNKWN" is not indicated. This indicates normal communication between IPDM-E and its receiving units. Do not draw any line.
  3. Based on information received from "CAN DIAG SUPPORT MNTR", place a check mark on the known good CAN communication line between ECM and IPDM-E.
    1. Through the previous procedure, the circuit between ADP splice and TCM has the most amount of lines (shade 3-a in the figure).
    2. Place a check mark on the known good lines to establish the error circuit.

      Reception item of "IPDM E/R": On "ECM", "OK" is indicated. IPDM-E communicates normally with ECM. Put a check mark on the normal circuit between ECM and IPDM-E (check mark 3-b in the figure).

      Fig 5: Identifying Present Error Example - Open Circuit (5 Of 6)
      G04903987Courtesy of NISSAN NORTH AMERICA, INC.
  4. Through the above procedure, the error is detected in the TCM branch line (shaded in the figure).
    NOTE: For abbreviations, refer to "ABBREVIATION LIST ".
  5. Perform the inspection for the detected error circuit. For the inspection procedure, refer to "MALFUNCTION AREA CHART ".
    Fig 6: Identifying Present Error Example - Open Circuit (6 Of 6)
    G04903988Courtesy of NISSAN NORTH AMERICA, INC.
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