DTC U0074:00 [FW6A-EL]

id050225908000

DTC U0074:00

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

DETECTION CONDITION

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

―  Battery voltage is 10 V or more.

Diagnostic support note

•  The MIL does not illuminate.

•  The AT warning light does not illuminate.

•  PENDING CODE is available.

•  FREEZE FRAME DATA is not available.

•  The 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 i-stop control.

•  Inhibits AAS.

•  Inhibits 5GR and 6GR.

•  Inhibits shift down when the accelerator pedal is depressed.

POSSIBLE CAUSE

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

•  PCM DTC is stored.

•  TCM malfunction

SYSTEM WIRING DIAGRAM

—

DTC U0074:00	CAN system communication error (local CAN between TCM and PCM)
DETECTION CONDITION	• Under the following conditions, a communication error (local CAN between TCM and PCM) occurs: ― Battery voltage is 10 V or more. Diagnostic support note • The MIL does not illuminate. • The AT warning light does not illuminate. • PENDING CODE is available. • FREEZE FRAME DATA is not available. • The 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 i-stop control. • Inhibits AAS. • Inhibits 5GR and 6GR. • Inhibits shift down when the accelerator pedal is depressed.
POSSIBLE CAUSE	• CAN communication line between TCM and PCM (local CAN between TCM and PCM) malfunction • PCM DTC is stored. • TCM malfunction
SYSTEM WIRING DIAGRAM	—

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	CONFIRM PCM DTC • Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) • Are any DTCs present?	Yes	DTC U0074:00 is displayed: • CAN communication line can be considered the cause. ― Repair or replace the wiring harness between TCM and PCM. DTC other than U0074:00 is displayed: • Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0].)
2		No	Go to the next step.
3	VERIFY DTC TROUBLESHOOTING COMPLETED • 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 to 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].)
3		No	Go to the next step.
4	VERIFY NO DTC HAS BEEN PRESENTED • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)
4	VERIFY NO DTC HAS BEEN PRESENTED • Are any DTCs present?	No	DTC troubleshooting completed.