DTC U0298:00 [SKYACTIV-D 1.5]

id0102q2910500

Details On DTCs

DTC U0298:00

CAN/LIN communication system: DC-DC converter information communication error with front body control module (FBCM)

DETECTION CONDITION

•  With the following conditions met, a communication error between the PCM and DC-DC converter is continued for 0.75 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

VEHICLE STATUS WHEN DTCs ARE OUTPUT

•  Flashes i-stop warning light (amber).

POSSIBLE CAUSE

•  Communication line malfunction between DC-DC converter and front body control module (FBCM)

•  Communication line malfunction between front body control module (FBCM) and PCM

•  DC-DC converter connector or terminals malfunction

•  Short to ground or open circuit in DC-DC converter power supply circuit

―  Short to ground in wiring harness between GLOW 80 A fuse and DC-DC converter terminal L

―  GLOW 80 A fuse malfunction

―  DCDC DE 40 A fuse malfunction

―  Open circuit in wiring harness between battery positive terminal and DC-DC converter terminal L

•  Short to ground or open circuit in DC-DC converter power supply circuit

―  Short to ground in wiring harness between C/U IG1 15 A fuse and DC-DC converter terminal H

―  C/U IG1 15 A fuse malfunction

―  Open circuit in wiring harness between IG1 relay terminal C and DC-DC converter terminal H

•  Front body control module (FBCM) connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  DC-DC converter terminal C—Front body control module (FBCM) terminal 2H

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

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

•  Open circuit in wiring harness between DC-DC converter terminal C and front body control module (FBCM) terminal 2H

•  DC-DC converter malfunction

•  Front body control module (FBCM) malfunction

DTC U0298:00	CAN/LIN communication system: DC-DC converter information communication error with front body control module (FBCM)
DETECTION CONDITION	• With the following conditions met, a communication error between the PCM and DC-DC converter is continued for 0.75 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
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• Flashes i-stop warning light (amber).
POSSIBLE CAUSE	• Communication line malfunction between DC-DC converter and front body control module (FBCM) • Communication line malfunction between front body control module (FBCM) and PCM • DC-DC converter connector or terminals malfunction • Short to ground or open circuit in DC-DC converter power supply circuit ― Short to ground in wiring harness between GLOW 80 A fuse and DC-DC converter terminal L ― GLOW 80 A fuse malfunction ― DCDC DE 40 A fuse malfunction ― Open circuit in wiring harness between battery positive terminal and DC-DC converter terminal L • Short to ground or open circuit in DC-DC converter power supply circuit ― Short to ground in wiring harness between C/U IG1 15 A fuse and DC-DC converter terminal H ― C/U IG1 15 A fuse malfunction ― Open circuit in wiring harness between IG1 relay terminal C and DC-DC converter terminal H • Front body control module (FBCM) connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― DC-DC converter terminal C—Front body control module (FBCM) terminal 2H ― Front body control module (FBCM) terminal 2K—PCM terminal 2C ― Front body control module (FBCM) terminal 2I—PCM terminal 2D • Open circuit in wiring harness between DC-DC converter terminal C and front body control module (FBCM) terminal 2H • DC-DC converter malfunction • Front body control module (FBCM) malfunction

Repeatability Verification Procedure

1. Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 1.5].)

2. Start the engine.

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.

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].)

No

Go to the next step.

4

INSPECT DC-DC CONVERTER CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the DC-DC converter 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 13.

No

Go to the next step.

5

INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT

•  Verify that the DC-DC converter connector is disconnected.

•  Measure the voltage at the DC-DC converter terminal L (wiring harness-side).

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the GLOW 80 A fuse and DCDC DE 40 A fuse.

•  If the fuse is blown:

―  Refer to the wiring diagram and verify whether or not there is a common connector between GLOW 80 A fuse and DC-DC converter terminal L.

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 short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

•  Replace the malfunctioning fuse.

•  If the fuse is damaged:

―  Replace the malfunctioning fuse.

•  If all fuses are normal:

―  Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and DC-DC converter terminal L.

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 an open circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has an open circuit.

Go to Step 13.

6

INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT

•  Verify that the DC-DC converter connector is disconnected.

•  Switch the ignition ON (engine off).

Note

•  Another DTC may be stored by the PCM detecting an open circuit.

•  Measure the voltage at the DC-DC converter terminal H (wiring harness-side).

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the C/U IG1 15 A fuse.

•  If the fuse is blown:

―  Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and DC-DC converter terminal H.

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 short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

•  Replace the fuse.

•  If the fuse is damaged:

―  Replace the fuse.

•  If the fuse is normal:

―  Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and DC-DC converter terminal H.

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 an open circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has an open circuit.

Go to Step 13.

7

INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the front body control module (FBCM) 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 13.

No

Go to the next step.

8

INSPECT DC-DC CONVERTER LIN COMMUNICATION LINE FOR SHORT TO GROUND

•  Verify that the DC-DC converter and front body control module (FBCM) connectors are disconnected.

•  Inspect for continuity between DC-DC converter terminal C (wiring harness-side) and body ground.

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter terminal C and front body control module (FBCM) terminal 2H.

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 short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

Go to Step 13.

No

Go to the next step.

9

INSPECT FRONT BODY CONTROL MODULE (FBCM) CIRCUIT FOR SHORT TO GROUND

•  Verify that the DC-DC converter and front body control module (FBCM) connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:

―  Front body control module (FBCM) terminal 2K

―  Front body control module (FBCM) terminal 2I

•  Is there continuity?

Yes

Disconnect the PCM connector and inspect the wiring harness for short to ground.

•  If the short to ground circuit could be detected in the wiring harness:

―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

•  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 short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

•  If the short to ground circuit could not be detected in the wiring harness:

―  Replace the front body control module (FBCM) or DC-DC converter.
(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

(See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)

Go to Step 13.

No

Go to the next step.

10

INSPECT DC-DC CONVERTER LIN COMMUNICATION LINE FOR OPEN CIRCUIT

•  Verify that the DC-DC converter and front body control module (FBCM) connectors are disconnected.

•  Inspect for continuity between DC-DC converter terminal C (wiring harness-side) and front body control module (FBCM) terminal 2H (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter terminal C and front body control module (FBCM) terminal 2H.

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 an open circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has an open circuit.

Go to Step 13.

11

INSPECT DC-DC CONVERTER

•  Inspect the DC-DC converter.
(See DC-DC CONVERTER INSPECTION [SKYACTIV-D 1.5].)

•  Is there any malfunction?

Yes

Replace the DC-DC converter, then go to Step 13.

(See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)

No

Go to the next step.

12

INSPECT FRONT BODY CONTROL MODULE (FBCM)

•  Inspect the front body control module (FBCM).
(See FRONT BODY CONTROL MODULE (FBCM) INSPECTION.)

•  Is there any malfunction?

Yes

Replace the front body control module (FBCM), then go to the next step.

(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

13

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].)

•  Implement the repeatability verification procedure.
(See Repeatability Verification Procedure.)

•  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.

No

Go to the next step.

14

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].)

No

DTC troubleshooting completed.

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	INSPECT DC-DC CONVERTER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the DC-DC converter 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 13.
4		No	Go to the next step.
5	INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Verify that the DC-DC converter connector is disconnected. • Measure the voltage at the DC-DC converter terminal L (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the GLOW 80 A fuse and DCDC DE 40 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between GLOW 80 A fuse and DC-DC converter terminal L. 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 short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the malfunctioning fuse. • If the fuse is damaged: ― Replace the malfunctioning fuse. • If all fuses are normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and DC-DC converter terminal L. 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 13.
6	INSPECT DC-DC CONVERTER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Verify that the DC-DC converter connector is disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the DC-DC converter terminal H (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
6		No	Inspect the C/U IG1 15 A fuse. • If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between C/U IG1 15 A fuse and DC-DC converter terminal H. 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 short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • If the fuse is damaged: ― Replace the fuse. • If the fuse is normal: ― Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal C and DC-DC converter terminal H. 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 13.
7	INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the front body control module (FBCM) 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 13.
7		No	Go to the next step.
8	INSPECT DC-DC CONVERTER LIN COMMUNICATION LINE FOR SHORT TO GROUND • Verify that the DC-DC converter and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between DC-DC converter terminal C (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter terminal C and front body control module (FBCM) terminal 2H. 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 short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 13.
8		No	Go to the next step.
9	INSPECT FRONT BODY CONTROL MODULE (FBCM) CIRCUIT FOR SHORT TO GROUND • Verify that the DC-DC converter and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Front body control module (FBCM) terminal 2K ― Front body control module (FBCM) terminal 2I • Is there continuity?	Yes	Disconnect the PCM connector and inspect the wiring harness for short to ground. • If the short to ground circuit could be detected in the wiring harness: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • 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 short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • If the short to ground circuit could not be detected in the wiring harness: ― Replace the front body control module (FBCM) or DC-DC converter. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.) (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to Step 13.
9		No	Go to the next step.
10	INSPECT DC-DC CONVERTER LIN COMMUNICATION LINE FOR OPEN CIRCUIT • Verify that the DC-DC converter and front body control module (FBCM) connectors are disconnected. • Inspect for continuity between DC-DC converter terminal C (wiring harness-side) and front body control module (FBCM) terminal 2H (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
10		No	Refer to the wiring diagram and verify whether or not there is a common connector between DC-DC converter terminal C and front body control module (FBCM) terminal 2H. 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 an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 13.
11	INSPECT DC-DC CONVERTER • Inspect the DC-DC converter. (See DC-DC CONVERTER INSPECTION [SKYACTIV-D 1.5].) • Is there any malfunction?	Yes	Replace the DC-DC converter, then go to Step 13. (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
11		No	Go to the next step.
12	INSPECT FRONT BODY CONTROL MODULE (FBCM) • Inspect the front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) INSPECTION.) • Is there any malfunction?	Yes	Replace the front body control module (FBCM), then go to the next step. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
12		No	Go to the next step.
13	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].) • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • 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.
13		No	Go to the next step.
14	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].)
14		No	DTC troubleshooting completed.