Symptom Diagnosis
WARNING: This page is about a different car, the 2003 Toyota Prius, 2002 Toyota Prius, and 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
If a normal DTC is displayed during DTC check but problem still occurs, check circuits for each problem symptom in order given in SYMPTOM DIAGNOSIS table, then see specified procedure or appropriate test underSELF-DIAGNOSTIC SYSTEM or DIAGNOSTIC TESTS . If DTC C1242/ 42, C1251/ 51-C1257/ 57 is set, see Fig 1.
SYMPTOM DIAGNOSIS
| Symptom | Circuit, DTC Or Procedure | |||||
|---|---|---|---|---|---|---|
| ABS Inoperative (1) | ||||||
| Check DTC, Confirm Normal Code Is Output | RETRIEVING DIAGNOSTIC TROUBLE CODES | |||||
| Power IG Source Circuit | DTC 41 | |||||
| Speed Sensor Circuit | 31, 32, 33 & 34 | |||||
| Check Hydraulic Brake Booster With TOYOTA Hand-Held Tester | (2) | |||||
| Check For Hydraulic Leakage | Visual Inspection | |||||
| ABS Does Not Operate Efficiently(1) | ||||||
| Check DTC, Confirm Normal Code Is Output | RETRIEVING DIAGNOSTIC TROUBLE CODES | |||||
| Speed Sensor Circuit | 31, 32, 33 & 34 | |||||
| Stoplight Switch Circuit | DTC 49 | |||||
| Check Hydraulic Brake Booster With TOYOTA Hand-Held Tester | (2) | |||||
| Check For Hydraulic Leakage | Visual Inspection | |||||
| RBS Does Not Operate | ||||||
| Check DTC, Confirm Normal Code Is Output | RETRIEVING DIAGNOSTIC TROUBLE CODES | |||||
| IG Power Source Circuit | DTC 41 | |||||
| Master Cylinder Pressure Sensor Circuit | DTCS C0226/ 21, C0236/ 22, C0246/ 23, C1217/ 25, C1218/ 26 & C1219/ 27 | |||||
| Wheel Cylinder Pressure Sensor Circuit | DTCS C0226/ 21, C0236/ 22, C0246/ 23, C1217/ 25, C1218/ 26 & C1219/ 27 | |||||
| Check Hydraulic Brake Booster With TOYOTA Hand-Held Tester | (2) | |||||
| Check For Hydraulic Leakage | Visual Inspection | |||||
| ABS Warning Light Abnormal | ||||||
| ABS Warning Light Circuit | ABS WARNING LIGHT | |||||
| BRAKE Warning Light | Replace ABS ECU (1) | |||||
| BRAKE Warning Light Abnormal(1) | ||||||
| BRAKE Warning Light Circuit | BRAKE WARNING LIGHT CIRCUIT | |||||
| ABS ECU | Replace ABS ECU (1) | |||||
| Unable To Perform DTC Check (1) | ||||||
| ABS Warning Light Circuit | ABS WARNING LIGHT | |||||
| Tc Terminal Circuit | Tc TERMINAL | |||||
| Unable To Perform Sensor Diagnostics | ||||||
| Ts Terminal | Ts TERMINAL | |||||
| ABS ECU | Replace ABS ECU (1) | |||||
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