Present Error - Open Circuit -

WARNING: This page is about a different car, the 2011 Suzuki Equator. However, it is still accessible from the selected car via links, so may be relevant.

Identify the error circuit using information from the "Bus check" ("ECU list" included).

ECU list: Check the items indicated in "ECU list". 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 not indicated. An error may be on the power supply of the control unit, DDL1 line or DDL2 line.
1. "TCM" which is Diag on CAN unit, is not indicated on "ECU list". 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 below).
  NOTE:
  - Diag on CAN units are not indicated on the "ECU list" 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: DESCRIPTION ].
  Fig 1: CAN Communication Diagram (Error Between DLC And TCM)
  Courtesy of SUZUKI OF AMERICA CORP.
Bus check: Check each item on "Bus check". Draw a line on the diagnosis sheet to indicate the error circuit.
1. Reception item of "ECM": 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 below).
  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 "AFS": 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 below).
3. Reception item of "AV": "UNKWN" is not indicated. This indicates normal communication between AV and its receiving units. Do not draw any line.
  
  Fig 2: CAN Communication Diagram (Error Between AFS And TCM)
  Courtesy of SUZUKI OF AMERICA CORP.
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 below).
5. Reception item of "EPS" and "I-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 bus check (without PAST), "UNKWN" is indicated even though the item is not used in the trouble diagnosis. For the details of each item on bus check, refer to [BUS CHECK ].
  
  Fig 3: CAN Communication Diagram (Error Between BCM And TCM)
  Courtesy of SUZUKI OF AMERICA CORP.
6. Reception item of "M&A": 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 below).
7. Reception item of "ADP": 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 below).
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: CAN Communication Diagram (Error Between ADP And TCM)
  Courtesy of SUZUKI OF AMERICA CORP.
9. Reception item of "IPDM-E": "UNKWN" is not indicated. This indicates normal communication between IPDM-E and its receiving units. Do not draw any line.
Based on information received from "Bus check", 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 below).
2. Place a check mark on the known good lines to establish the error circuit.
  Reception item of "IPDM-E": 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 below).
  
  Fig 5: CAN Communication Diagram (ECM And IPDM-E)
  Courtesy of SUZUKI OF AMERICA CORP.
Through the above procedure, the error is detected in the TCM branch line (shaded in the figure below).
NOTE: For abbreviations, refer to [HOW TO USE THIS SECTION ].
Perform the inspection for the detected error circuit. For the inspection procedure, refer to "MALFUNCTION AREA CHART ".

Fig 6: CAN Communication Diagram (TCM Branch Line)
Courtesy of SUZUKI OF AMERICA CORP.