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TROUBLESHOOTING ANTI-SKID BRAKING SYSTEM (ABS) 35B-51 STEP 3. Check the ABS-ECU power supply Q: Is the check result normal? YES : Go to Step 4. NO : Carry out the diagnosis of ABS-ECU power Then go to Step 7. STEP 4. Hydraulic unit (integrated with ). Q: Is the check result normal? YES : Go to Step 5. NO : Connect the brake tube correctly. Then go STEP 5. Operation check Q: Does the ABS work normally? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ). NO : Check the brake system related STEP 6. Operation check Q: Does the ABS work normally? YES : This diagnosis is complete. NO : Replace the hydraulic unit (integrated with ). Then go to Step 7. STEP 7. Operation check Q: Does the ABS warning lamp turn ON and OFF normally? This diagnosis is complete. NO : Return to Step 1. Inspection Procedure 8: ABS-ECU power supply circuit system CAUTION • When the ABS-ECU power supply voltage becomes 9.7 ± 0.3 V or less, the ABS warning lamp illuminate, and the ABS control is pro- • If the battery terminal is not tightened prop- erly, a dump surge may occur and the power OPERATION • ABS-ECU contains the power supply circuit (+BV terminal) for the solenoid valve. The solenoid • ABS-ECU contains the power supply circuit (+BM terminal) for the pump motor. The pump motor is • ABS-ECU contains the power supply circuit (IG1 terminal) for ABS-ECU. When the ignition switch • When malfunction occurs in ABS-ECU power supply, the communication with M.U.T.-III PROBABLE CAUSES • Damaged wiring harness and connectors • Malfunction of fuse and fusible link • Improper tightening of battery terminal • Improper tightening of earth bolt • Battery failure • Charging system failed • Malfunction of ABS-ECU DIAGNOSTIC PROCEDURE STEP 1. Battery check − Battery Test . Q: Is the battery in good condition? YES : Go to Step 3. NO : Charge or replace the battery. Then go to STEP 2. Charging system check − On−vehicle Service/Alternator Output Line Voltage Drop Test . Q: Is the charging system in good condition? YES : Go to Step 3. NO : Repair or replace the charging system |