DTC U0074:00 [SKYACTIV-D 1.5]

id0102q2339600

DTC U0074:00

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

DETECTION CONDITION

•  With the following conditions met, a CAN bus communication line error is continued for 1 s or more.

MONITORING CONDITIONS

―  Battery voltage: 10 V or more

―  1.5 s have elapsed after the ignition was switched ON (engine off or on)

Diagnostic support note

•  This is an intermittent monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA is not available.

•  Snapshot data is 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 1G

―  TCM terminal H—PCM terminal 1C

•  TCM DTC is stored.

•  PCM malfunction

•  TCM malfunction

DTC U0074:00	CAN system communication error (local CAN between PCM and TCM)
DETECTION CONDITION	• With the following conditions met, a CAN bus communication line error is continued for 1 s or more. MONITORING CONDITIONS ― Battery voltage: 10 V or more ― 1.5 s have elapsed after the ignition was switched ON (engine off or on) Diagnostic support note • This is an intermittent monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA is not available. • Snapshot data is 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 1G ― TCM terminal H—PCM terminal 1C • TCM DTC is stored. • PCM malfunction • TCM malfunction

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the snapshot data on the repair order.	—	Go to the next step.
2	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.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND/OR DTC • 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-D 1.5].) • Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
3		No	Go to the next step.
4	CONFIRM TCM DTC • Perform the TCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [EW6A-EL].) • Are any DTCs present?	Yes	DTC U0074:00 or U0115:00 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 the following terminals: • TCM terminal G—PCM terminal 1G • TCM terminal H—PCM terminal 1C 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 and U0115:00 is displayed: • Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [EW6A-EL].)
4		No	PCM can be considered the cause. • Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
5	VERIFY DTC TROUBLESHOOTING COMPLETED • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 1.5].) • Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 1.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [EW6A-EL].) Go to the next step.
5		No	Go to the next step.
6	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 1.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
6		No	DTC troubleshooting completed.