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ECK-164 < DTC/CIRCUIT DIAGNOSIS > [K9K] U0299 LOST COMMUNICATION (DC/DC CONVERTER) U0299 LOST COMMUNICATION (DC/DC CONVERTER) DTC Logic INFOID:0000000010434244 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If the other DTC Confirmation Procedure is performed right before this procedure, the ignition switch must be >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE-1 1. Turn ignition switch ON and wait at least 10 seconds. 2. Check DTC. Is DTC detected? YES >> Proceed to ECK-164, "Diagnosis Procedure" NO >> GO TO 3. 3. PERFORM DTC CONFIRMATION PROCEDURE-2 1. Start the engine and let it idle for at least 5 minutes. 2. Check DTC. Is DTC detected? YES >> Proceed to ECK-164, "Diagnosis Procedure" NO >> INSPECTION END Diagnosis Procedure INFOID:0000000010434245 1. CHECK ENGINE COMMUNICATION LINE 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect DC/DC converter harness connector, alternator harness connector, and active grille shutter 4. Check the continuity between ECM harness connector and DC/DC converter harness connector. 5. Also check harness for short to ground and to power. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace error-detected parts. 2. CHECK INTERMITTENT INCIDENT Perform intermittent incident. Refer to GI-41, "Intermittent Incident" Is the inspection result normal? DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause U0299 COMMUNICATION ERROR (LOST) • ECM receives an abnormality signal sent from DC/DC converter. • ECM is not receiving LIN communica- tion signal sent from DC/DC converter. • DC/DC converter (LIN communication line) + − Continuity ECM DC/DC converter Connector Terminal Connector Terminal F81 141 M22 7 Existed |