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AUTO A/C DIAGNOSIS HEATER, AIR CONDITIONING AND VENTILATION 55-56 DTC U1100: Electronic control unit Time-out (Related to Engine) CAUTION If DTC U1100 is set in the A/C-ECU, diagnose the CAUTION Whenever the ECU is replaced, ensure that the . TROUBLE JUDGMENT The A/C-ECU receives engine control sys- . TECHNICAL DESCRIPTION (COMMENT) Current trouble • Connector(s) or wiring harness in the CAN bus lines between the Electronic control unit and the Past trouble • If DTC U1100 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring NOTE: For a past trouble, you cannot find it by − How to Cope with Intermittent Malfunctions ) and check the CAN bus lines. You can narrow down the possi- . TROUBLESHOOTING HINTS • Electronic control unit failed • Malfunction of the A/C-ECU • Damaged harness wires and connectors • Refer to component locations GROUP- • Refer to configuration diagrams GROUP- • Refer to circuit diagrams GROUP- DIAGNOSIS Required Special Tools: • : Diagnostic Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A (Vehicles with CAN communication system) |