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 article.
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 PROBLEM SYMPTOM CHART
| Symptom | Suspected Area | See |
|---|---|---|
| ABS, BA and/or EBD does not operate | 1. Use a chassis dynamometer, etc. to check the Electronically Controlled Brake operation | - |
| 2. Check the DTC again and make sure that the normal system code is output | DTC CHECK / CLEAR | |
| 3. IG power source circuit | DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE; DTC C1242/42 OPEN IN IG1 / IG2 POWER SOURCE CIRCUIT | |
| 4. Front speed sensor circuit | DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT; DTC C0205/32 FRONT SPEED SENSOR LH CIRCUIT; DTC C1271/71 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); DTC C1272/72 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC) | |
| 5. Rear speed sensor circuit | DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; DTC C1273/73 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR RH (TEST MODE DTC); DTC C1274/74 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR LH (TEST MODE DTC) | |
| 6. Check the brake actuator assembly with Techstream (Check brake actuator assembly operation using the Active Test function) If abnormal, check the hydraulic circuit for leakage | BRAKE ACTUATOR | |
| 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 | 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 | DTC CHECK / CLEAR | |
| 3. Front speed sensor circuit | DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT; DTC C0205/32 FRONT SPEED SENSOR LH CIRCUIT; DTC C1271/71 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); DTC C1272/72 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC) | |
| 4. Rear speed sensor circuit | DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; DTC C1273/73 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR RH (TEST MODE DTC); DTC C1274/74 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR LH (TEST MODE DTC) | |
| 5. Check the brake actuator assembly with Techstream (Check brake actuator assembly operation using the Active Test function) If abnormal, check the hydraulic circuit for leakage | BRAKE ACTUATOR | |
| 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 | 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 | DTC CHECK / CLEAR |
| 2. IG power source circuit | DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE; DTC C1242/42 OPEN IN IG1 / IG2 POWER SOURCE CIRCUIT | |
| 3. Check the hydraulic circuit for leakage | - | |
| 4. Front speed sensor circuit | DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT; DTC C0205/32 FRONT SPEED SENSOR LH CIRCUIT; DTC C1271/71 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); DTC C1272/72 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC) | |
| 5. Rear speed sensor circuit | DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; DTC C1273/73 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR RH (TEST MODE DTC); DTC C1274/74 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR LH (TEST MODE DTC) | |
| 6. Yaw rate and deceleration sensor circuit | DTC C1234/34 YAW RATE SENSOR MALFUNCTION; DTC C1243/43 ACCELERATION SENSOR STUCK MALFUNCTION; DTC C1244/44 OPEN OR SHORT IN DECELERATION SENSOR CIRCUIT; DTC C1245/45 ACCELERATION SENSOR OUTPUT MALFUNCTION; DTC C1279/79 DECELERATION SENSOR OUTPUT VOLTAGE MALFUNCTION (TEST MODE DTC) | |
| 7. Steering angle sensor circuit | 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 | SKID CONTROL ECU | |
| Sensor signal check cannot be done | 1. TS and CG terminal circuit | TS AND CG TERMINAL CIRCUIT |
| 2. Skid control ECU | SKID CONTROL ECU | |
| DTC check cannot be done | 1. Check the DTC again and make sure that the normal system code is output | DTC CHECK / CLEAR |
| 2. TC and CG terminal circuit | 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 | SKID CONTROL ECU | |
| ABS warning light abnormal (Remains on) | 1. ABS warning light circuit | ABS WARNING LIGHT REMAINS ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| ABS warning light abnormal (Does not come on) | 1. ABS warning light circuit | ABS WARNING LIGHT DOES NOT COME ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| Brake control warning light (Multi information display) abnormal (Remains on) | 1. Brake control warning light circuit | BRAKE CONTROL WARNING LIGHT REMAINS ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| Brake control warning light (Multi information display) abnormal (Does hot come on) | 1. Brake control warning light circuit | BRAKE CONTROL WARNING LIGHT DOES NOT COME ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| BRAKE warning light abnormal (Remains on) | 1. Brake fluid level warning light switch circuit | DTC C1202/68 MASTER RESERVOIR LEVEL MALFUNCTION |
| 2. BRAKE warning light circuit | BRAKE WARNING LIGHT REMAINS ON | |
| 3. Skid control ECU | SKID CONTROL ECU | |
| BRAKE warning light abnormal (Does not come on) | 1. BRAKE warning light circuit | BRAKE CONTROL WARNING LIGHT DOES NOT COME ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| SLIP indicator light abnormal (Remains on) | 1. SLIP indicator light circuit | SLIP INDICATOR LIGHT REMAINS ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| SLIP indicator light abnormal (Does not come on) | 1. SLIP indicator light circuit | SLIP INDICATOR LIGHT DOES NOT COME ON |
| 2. Skid control ECU | SKID CONTROL ECU | |
| Skid control buzzer abnormal | 1. Skid control buzzer circuit | SKID CONTROL BUZZER CIRCUIT |
| 2. Skid control ECU | SKID CONTROL ECU |