Problem Symptoms Table
If there are no DTCs output but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTE:
When replacing the skid control ECU, sensor, etc., turn the ignition switch off.
HINT:
Inspect the fuse and relay before investigating the suspected areas as shown in the table below. Inspect each malfunctioning circuit in numerical order for the corresponding symptom.
ELECTRONICALLY CONTROLLED BRAKE SYSTEM
ELECTRONICALLY CONTROLLED BRAKE SYSTEM SYMPTOM
| Symptom | Suspected area |
|---|---|
| ABS, BA and/or EBD does not operate | 1. Use a chassis dynamometer, etc. to check the ECB operation |
| 2. Check the DTC again and make sure that the normal system code is output. See DTC CHECK / CLEAR | |
| 3. IG POWER SOURCE CIRCUIT | |
| 4. FRONT SPEED SENSOR CIRCUIT | |
| 5. REAR SPEED SENSOR CIRCUIT | |
| 6. Check the brake actuator assembly with the intelligent tester (Check brake actuator assembly operation using the active test function) If abnormal, check the hydraulic circuit for leakage. See DATA LIST / ACTIVE TEST | |
| 7. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU. See SKID CONTROL ECU | |
| ABS, BA and/or EBD does not operate efficiently | 1. Check that traction control has not operated by carrying out diagnosis (Traction control does not operate while the traction OFF switch is ON and the brake control warning light and SLIP indicator light are ON) |
| 2. Check the DTC again and make sure that the normal system code is output. See DTC CHECK / CLEAR | |
| 3. FRONT SPEED SENSOR CIRCUIT | |
| 4. REAR SPEED SENSOR CIRCUIT | |
| 5. Check the brake actuator assembly with the intelligent tester (Check brake actuator assembly operation using the active test function) If abnormal, check the hydraulic circuit for leakage. See DATA LIST / ACTIVE TEST | |
| 6. If the symptoms still occur even after the above circuits in suspected areas are inspected and proved to be normal, replace the skid control ECU. See SKID CONTROL ECU | |
| VSC and/or TRAC does not operate | 1. Check the DTC again and make sure that the normal system code is output. See DTC CHECK / CLEAR |
| 2. IG POWER SOURCE CIRCUIT | |
| 3. Check the hydraulic circuit for leakage | |
| 4. FRONT SPEED SENSOR CIRCUIT | |
| 5. REAR SPEED SENSOR CIRCUIT | |
| 6. Yaw rate and acceleration sensor circuit. See TEST MODE PROCEDURE | |
| 7. Steering angle sensor circuit. See DTC C1231/31 STEERING ANGLE SENSOR CIRCUIT MALFUNCTION | |
| 8. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU. See SKID CONTROL ECU | |
| Sensor signal check cannot be done | 1. TS AND CG TERMINAL CIRCUIT |
| 2. SKID CONTROL ECU | |
| DTC check cannot be done | 1. Check the DTC again and make sure that the normal system code is output. See DTC CHECK / CLEAR |
| 2. TC AND CG TERMINAL CIRCUIT | |
| 3. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU. See SKID CONTROL ECU | |
| ABS warning light abnormal (Remains on) | 1. ABS WARNING LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| ABS warning light abnormal (Does not come on) | 1. ABS WARNING LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| Brake control warning light (Multi information display) abnormal (Remains on) | 1. BRAKE CONTROL WARNING LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| Brake control warning light (Multi information display) abnormal (Does not come on) | 1. BRAKE CONTROL WARNING LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| BRAKE warning light abnormal (Remains on) | 1. Brake fluid level warning light switch circuit. See DTC C1202/68 MASTER RESERVOIR LEVEL MALFUNCTION |
| 2. BRAKE WARNING LIGHT CIRCUIT | |
| 3. SKID CONTROL ECU | |
| BRAKE warning light abnormal (Does not come on) | 1. BRAKE WARNING LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| SLIP indicator light abnormal (Remains on) | 1. SLIP INDICATOR LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| SLIP indicator light abnormal (Does not come on) | 1. SLIP INDICATOR LIGHT CIRCUIT |
| 2. SKID CONTROL ECU | |
| Skid control buzzer abnormal | 1. SKID CONTROL BUZZER CIRCUIT |
| 2. SKID CONTROL ECU |