DTC U0338:00 [SKYACTIV-D 1.5]

id0102q2901600

DTC U0338:00

Start stop unit error

DETECTION CONDITION

•  If any of the following conditions are met:

―  With the battery voltage 10 V or more, any of the following conditions is continuously met for 3.5 s.

•  Check sum error in signal from start stop unit

•  Counter error in signal from start stop unit

―  PCM receives error signal from start stop unit for 1 s.

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 drive error (instrument cluster or PCM)

•  CAN communication line malfunction between start stop unit and PCM

―  Start stop unit terminal 2M—Front body control module (FBCM) terminal 2P

―  Start stop unit terminal 2O—Front body control module (FBCM) terminal 2N

―  Front body control module (FBCM) terminal 2K—PCM terminal 2C

―  Front body control module (FBCM) terminal 2I—PCM terminal 2D

•  Front body control module (FBCM) malfunction

•  Start stop unit connector or terminals malfunction

•  PCM connector or terminals malfunction

•  Start stop unit malfunction

•  PCM malfunction

DTC U0338:00	Start stop unit error
DETECTION CONDITION	• If any of the following conditions are met: ― With the battery voltage 10 V or more, any of the following conditions is continuously met for 3.5 s. • Check sum error in signal from start stop unit • Counter error in signal from start stop unit ― PCM receives error signal from start stop unit for 1 s. 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 drive error (instrument cluster or PCM) • CAN communication line malfunction between start stop unit and PCM ― Start stop unit terminal 2M—Front body control module (FBCM) terminal 2P ― Start stop unit terminal 2O—Front body control module (FBCM) terminal 2N ― Front body control module (FBCM) terminal 2K—PCM terminal 2C ― Front body control module (FBCM) terminal 2I—PCM terminal 2D • Front body control module (FBCM) malfunction • Start stop unit connector or terminals malfunction • PCM connector or terminals malfunction • Start stop unit malfunction • PCM 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 DTC FOR MODULE COMMUNICATION • 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 FRONT BODY CONTROL MODULE (FBCM) DTC • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
4		No	Go to the next step.
5	CONFIRM START STOP UNIT DTC • Perform the start stop unit DTC inspection using the M-MDS. (See DTC INSPECTION [START STOP UNIT].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [START STOP UNIT].)
5		No	Go to the next step.
6	CONFIRM INSTRUMENT CLUSTER DTC • Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
6		No	Go to the next step.
7	INSPECT START STOP UNIT CONNECTOR CONDITION • Switch the ignition off. • Disconnect the start stop unit connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to the next step.
8		No	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: ― Start stop unit terminal 2M—Front body control module (FBCM) terminal 2P ― Start stop unit terminal 2O—Front body control module (FBCM) terminal 2N ― Front body control module (FBCM) terminal 2K—PCM terminal 2C ― Front body control module (FBCM) terminal 2I—PCM terminal 2D 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. If the malfunction recurs, replace the start stop unit. (See START STOP UNIT REMOVAL/INSTALLATION.) Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • 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 PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to the next step.
9		No	Go to the next step.
10	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].)
10		No	DTC troubleshooting completed.