Problem Symptoms Table
NOTE:
When replacing the skid control ECU, sensor, etc., make sure that turn engine switch is turned off, the stop light switch is off, 2 minutes have elapsed since the driver's door was closed.
HINT:
- Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
- Since the oil passage is blocked off by the master cut solenoid during Electronically Controlled Brake System control, there is no kickback (vibration) to the brake pedal, creating a quiet operating sound even while the ABS is operating.
ELECTRONICALLY CONTROLLED BRAKE SYSTEM:
PROBLEM SYMPTOMS - ELECTRONICALLY CONTROLLED BRAKE SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| ABS, BA and/or EBD does not operate | 1. Use a chassis dynamometer, etc. to check the Electronically Controlled Brake System operation | - |
| 2. Check the DTC again and make sure that the normal system code is output | DIAGNOSIS SYSTEM | |
| 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 the intelligent tester (Check brake actuator assembly operation using the ACTIVE TEST function). If abnormal, check the hydraulic circuit for leakage. | ON-VEHICLE INSPECTION | |
| 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 (FOR 3UZ-FE) | |
| ABS, BA and/or EBD does not operate efficiently | 1. Check the DTC again and make sure that the normal system code is output | DIAGNOSIS SYSTEM |
| 2. 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) | |
| 3. 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) | |
| 4. 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. | ON-VEHICLE INSPECTION | |
| 5. 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 (FOR 3UZ-FE) | |
| VSC and/or TRAC does not operate | 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 | DIAGNOSIS SYSTEM | |
| 3. IG power source circuit | DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE; DTC C1242/42 [OPEN IN IG1 / IG2 POWER SOURCE CIRCUIT | |
| 4. Check the hydraulic circuit for leakage | - | |
| 5. 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) | |
| 6. 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) | |
| 7. Yaw rate and acceleration sensor circuit | DTC C1234/34 YAW RATE SENSOR MALFUNCTION; DTC C0371/71 YAW RATE SENSOR (TEST MODE DTC); DTC C1243/4 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); DTC C1381/9 YAW RATE AND / OR ACCELERATION SENSOR POWER SUPPLY VOLTAGE MALFUNCTION | |
| 8. Steering angle sensor circuit | DTC C1231/31 STEERING ANGLE SENSOR CIRCUIT MALFUNCTION | |
| 9. 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 (FOR 3UZ-FE) | |
| Sensor signal check cannot be done | 1. TS and CG terminal circuit | TS AND CG TERMINAL CIRCUIT |
| 2. Skid control ECU | SKID CONTROL ECU (FOR 3UZ-FE) | |
| DTC check cannot be done | 1. Check the DTC again and make sure that the normal system code is output | DIAGNOSIS SYSTEM |
| 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 (FOR 3UZ-FE) | |
| ABS warning light abnormal (Remains on) | 1. ABS warning light circuit | ABS WARNING LIGHT REMAINS ON |
| 2. Skid control ECU | SKID CONTROL ECU (FOR 3UZ-FE) | |
| 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 (FOR 3UZ-FE) | |
| 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 (FOR 3UZ-FE) | |
| Brake control warning light (Multi-information display) abnormal (Does not come on) | 1. Brake control warning light circuit | BRAKE CONTROL WARNING LIGHT DOES NOT COME ON |
| 2. Skid control ECU | SKID CONTROL ECU (FOR 3UZ-FE) | |
| BRAKE warning light abnormal (Remains on) | 1. Brake fluid level warning 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 (FOR 3UZ-FE) | |
| BRAKE warning light abnormal (Does not come on) | 1. BRAKE warning light circuit | BRAKE WARNING LIGHT DOES NOT COME ON |
| 2. Skid control ECU | SKID CONTROL ECU (FOR 3UZ-FE) | |
| SLIP indicator light abnormal (Remains on) | 1. SLIP indicator light circuit | SLIP INDICATOR LIGHT REMAINS ON |
| 2. Skid control ECU | SKID CONTROL ECU (FOR 3UZ-FE) | |
| 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 (FOR 3UZ-FE) | |
| Skid control buzzer abnormal | 1. Skid control buzzer circuit | SKID CONTROL BUZZER CIRCUIT |
| 2. Skid control ECU | SKID CONTROL ECU (FOR 3UZ-FE) |