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CCS-108 < DTC/CIRCUIT DIAGNOSIS > [ICC (FULL SPEED RANGE)] C1A31 BCU INTERNAL MALF C1A31 BCU INTERNAL MALF Description INFOID:0000000005501664 The brake booster control unit inputs the brake fluid pressure control signal and release switch signal and DTC Logic INFOID:0000000005501665 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PERFORM DTC CONFIRMATION PROCEDURE 1. Start the engine. 2. Turn the MAIN switch of ICC system ON. 3. Perform “All DTC Reading” with CONSULT-III. 4. Check if the “C1A31” is detected as the current malfunction in “Self Diagnostic Result” of “ICC”. Is “C1A31” detected as the current malfunction? YES >> Refer to CCS-108, "Diagnosis Procedure" NO >> Refer to GI-36, "Intermittent Incident" . Diagnosis Procedure INFOID:0000000005501666 1. CHECK SELF-DIAGNOSIS RESULTS Check if any DTC other than “C1A31” is detected in “Self Diagnostic Result” of “ICC”. YES >> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to NO >> Replace the brake booster control unit. Special Repair Requirement INFOID:0000000005501667 DESCRIPTION Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following SPECIAL REPAIR REQUIREMENT 1. LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to >> GO TO 2. 2. CHECK ICC SYSTEM 1. Erase the “Self Diagnostic Result”, and then perform “All DTC Reading” again after performing the action CCS-18, "ACTION TEST : Description" DTC (On board dis- play) Trouble diagnosis name DTC detecting condition Possible causes C1A31 (31) BCU INTERNAL MALF Brake booster control unit internal malfunction Brake booster control unit |