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HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS TSB Revision BASIC BRAKE SYSTEM 35A-17 . CIRCUIT OPERATION . HBB DTC SET CONDITIONS . TROUBLESHOOTING HINTS • Malfunction of the battery • Malfunction of the charging system • Malfunction of the M-ASTC-ECU . DIAGNOSIS STEP 1. Check the battery. − On-vehicle Service − Battery Testing Procedure Q: Is the battery damaged? YES : Charge or replace the battery and then go to Step 4. NO : Go to Step 2. STEP 2. Check the charging system. − Diagnosis Q: Is the charging system damaged? YES : Repair the Charging System and then go to Step 4. NO : Go to Step 3. STEP 3. Recheck for diagnostic trouble code. Q: Is DTC 16 set? YES : Replace the M-ASTC-ECU (Refer to GROUP 35C, M-ASTC-ECU Then go to Step 4. NO : It can be assumed that this malfunction is − How to Cope with Intermittent Malfunction . STEP 4. Recheck for diagnostic trouble code. Q: Is DTC 16 set? YES : Start over at Step 1. NO : The procedure is complete. AC204548 AB CONNECTOR: E-111 E-111 AC203901AD CONNECTORS: E-119, E-120 E-119 E-120 |