DTC U0298:00 [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]

id0102h9910500

Details On DTCs (Without i-ELOOP)

DTC U0298:00	CAN/LIN communication system: DC-DC converter information communication error with front body control module (FBCM)
DETECTION CONDITION	•  PCM detects a DC-DC converter information communication error from front body control module (FBCM). Diagnostic support note •  This is a continuous monitor (other). •  The check engine light does not illuminate. •  FREEZE FRAME DATA (Mode 2) is not available. •  Snapshot data is available. •  DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	•  Inhibits engine-stop by operating the i-stop function.
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 DCDC 50 A fuse and DC-DC converter terminal L ―  DCDC 50 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 DC-DC converter terminal C and front body control module (FBCM) terminal 2H •  Open circuit in wiring harness between DC-DC converter terminal C and front body control module (FBCM) terminal 2H •  PCM connector or terminals malfunction •  Short to ground in wiring harness between the following terminals: ―  Front body control module (FBCM) terminal 2P—PCM terminal 2AK ―  Front body control module (FBCM) terminal 2N—PCM terminal 2AL •  Open circuit in wiring harness between the following terminals: ―  Front body control module (FBCM) terminal 2P—PCM terminal 2AK ―  Front body control module (FBCM) terminal 2N—PCM terminal 2AL •  DC-DC converter malfunction •  Front body control module (FBCM) malfunction •  PCM malfunction

Repeatability Verification Procedure (Without i-ELOOP)

Diagnostic Procedure (Without i-ELOOP)

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.
		No	Go to the next step.
2	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-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
		No	Go to the next step.
3	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 14.
		No	Go to the next step.
4	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 DCDC 50 A fuse. •  If the fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between DCDC 50 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 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 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 14.
5	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). •  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 14.
6	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 14.
		No	Go to the next step.
7	INSPECT DC-DC CONVERTER SIGNAL CIRCUIT 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 14.
		No	Go to the next step.
8	INSPECT DC-DC CONVERTER SIGNAL CIRCUIT 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 14.
9	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 Step 14.
		No	Go to the next step.
10	INSPECT FRONT BODY CONTROL MODULE (FBCM) CIRCUIT FOR SHORT TO GROUND •  Verify that the DC-DC converter, front body control module (FBCM) and PCM connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side) and body ground: ―  Front body control module (FBCM) terminal 2P ―  Front body control module (FBCM) terminal 2N •  Is there continuity?	Yes	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 2P—PCM terminal 2AK •  Front body control module (FBCM) terminal 2N—PCM terminal 2AL 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 14.
		No	Go to the next step.
11	INSPECT FRONT BODY CONTROL MODULE (FBCM) CIRCUIT FOR OPEN CIRCUIT •  Verify that the DC-DC converter, front body control module (FBCM) and PCM connectors are disconnected. •  Inspect for continuity between the following terminals (wiring harness-side): ―  Front body control module (FBCM) terminal 2P—PCM terminal 2AK ―  Front body control module (FBCM) terminal 2N—PCM terminal 2AL •  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 the following terminals: •  Front body control module (FBCM) terminal 2P—PCM terminal 2AK •  Front body control module (FBCM) terminal 2N—PCM terminal 2AL 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 14.
12	INSPECT DC-DC CONVERTER •  Inspect the DC-DC converter. (See DC-DC CONVERTER INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].) •  Is there any malfunction?	Yes	Replace the DC-DC converter, then go to Step 14. (See DC-DC CONVERTER REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-ELOOP)].)
		No	Go to the next step.
13	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.
14	VERIFY DTC TROUBLESHOOTING COMPLETED •  Always reconnect all disconnected connectors. •  Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Implement the repeatability verification procedure. (See Repeatability Verification Procedure (Without i-ELOOP).) •  Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Is the same DTC present?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) Go to the next step.
		No	Go to the next step.
15	VERIFY AFTER REPAIR PROCEDURE •  Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
		No	DTC troubleshooting completed.

Details On DTCs (With i-ELOOP)

DTC U0298:00	CAN communication: communication error to DC-DC converter (i-ELOOP)
DETECTION CONDITION	•  PCM detects a communication error between the PCM and DC-DC converter (i-ELOOP). Diagnostic support note •  This is a continuous monitor (other). •  The check engine light does not illuminate. •  FREEZE FRAME DATA (Mode 2) is not available. •  Snapshot data is available. •  DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	•  Inhibits engine-stop by operating the i-stop function.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	•  Flashes i-stop warning light (amber). •  Illuminates charging system warning light.
POSSIBLE CAUSE	•  Communication line malfunction between DC-DC converter (i-ELOOP) and PCM •  DC-DC converter (i-ELOOP) malfunction •  PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Repeatability Verification Procedure (With i-ELOOP)

Diagnostic Procedure (With i-ELOOP)

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.
		No	Go to the next step.
2	INSPECT ACCORDING TO THE DIAGNOSTIC PROCEDURE IN ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM] •  Inspect according to the diagnostic procedure in ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]. (See FOREWORD [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5, SKYACTIV-D 2.2 (MTX)].)	—	Go to the next step.
3	VERIFY DTC TROUBLESHOOTING COMPLETED •  Always reconnect all disconnected connectors. •  Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Implement the repeatability verification procedure. (See Repeatability Verification Procedure (With i-ELOOP).) •  Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Is the same DTC present?	Yes	Repeat the inspection from Step 1.
		No	Go to the next step.
4	VERIFY AFTER REPAIR PROCEDURE •  Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
		No	DTC troubleshooting completed.