DTC U0074:00

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

DETECTION CONDITION

• Under the following condition, a communication error (local CAN between TCM and PCM) occurs:

• Battery voltage is 10 V or more.

Diagnostic support note

• The check engine light does not illuminate.

• The automatic transaxle warning light does not illuminate.

• PENDING CODE is available.

• FREEZE FRAME DATA is not available.

• DTC is stored in the TCM memory.

FAIL-SAFE FUNCTION

• Set to TCC control.

• Inhibits learning control.

• Inhibits manual mode.

• Inhibits neutral idle control.

• Inhibits AAS.

• Inhibits 5GR and 6GR.

• Inhibits shift down when the accelerator pedal is depressed.

POSSIBLE CAUSE

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

• PCM DTC is stored.

• TCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

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

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

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

• Are any DTCs present?

Yes

DTC U0074:00 is displayed:

• CAN communication line can be considered the cause.

• Refer to the wiring diagram and verify whether or not there is a common connector between TCM and PCM.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a malfunction.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness.

• Go to the next step.

DTC other than U0074:00 is displayed:

• Go to the applicable DTC inspection.

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

No

Go to the next step.

3

• Clear the DTC using the M-MDS.

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

• Perform the following procedure to ensure that the DTC has been resolved:

• Switch the ignition ON (engine off or on).

• Perform the DTC inspection using the M-MDS.

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

• Is the same DTC present?

Yes

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

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

No

Go to the next step.

4

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

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

No

DTC troubleshooting completed.