DTC U0074:00

CAN system communication error (local CAN between PCM and TCM)

DETECTION CONDITION

• Malfunction in CAN bus communication line.

Diagnostic support note

• This is a continuous monitor (other).

• The check engine light does not illuminate.

• FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• CAN communication line malfunction between PCM and TCM (local CAN between PCM and TCM)

• TCM terminal G—PCM terminal 1A

• TCM terminal H—PCM terminal 1B

• TCM DTC is stored.

• PCM malfunction

• TCM malfunction

STEP

INSPECTION

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

• Switch the ignition off, then ON (engine off).

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].)

• Are any other PENDING CODEs and/or DTCs present?

Yes

Go to the applicable PENDING CODE or DTC inspection.

(See DTC TABLE [SKYACTIV-G 2.5].)

No

Go to the next step.

3

• Perform the TCM DTC inspection using the M-MDS.

  (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FW6A-EL].)

• Are any DTCs present?

Yes

DTC U0074:00 or U0115:00 is displayed:

• CAN communication line can be considered the cause.

• Repair or replace the wiring harness between PCM and TCM, then go to the next step.

DTC other than U0074:00 and U0115:00 is displayed:

• Go to the applicable DTC inspection.

  (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)

No

TCM can be considered the cause.

• Replace the control valve body, then go to the next step.

  (See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL].)

4

• Clear the DTC from the PCM memory using the M-MDS.

  (See CLEARING DTC [SKYACTIV-G 2.5].)

• Implement the repeatability verification procedure.

  (See Repeatability Verification Procedure.)

• Perform the DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5].)

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)

No

Go to the next step.

5

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [SKYACTIV-G 2.5].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SKYACTIV-G 2.5].)

No

DTC troubleshooting completed.