Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2006 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
When the malfunction is not confirmed in the diagnostic trouble code check and the problem still can not be confirmed in the basic inspection, use this table and troubleshoot according to the priority order given below.
PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | Reference |
|---|---|---|
| Engine does not crank (Does not start) | 1. No. 1 Motor generator | - |
| 2. Hybrid control system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Immobiliser | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 4. Smart key system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| No initial combustion (Does not start) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 3. Spark plug | ON-VEHICLE INSPECTION | |
| 4. Immobiliser system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 5. Injector | INSPECTION | |
| 6. ECM | TERMINALS OF ECM | |
| 7. Crankshaft position sensor circuit | DTC P0335 Crankshaft Position Sensor "A" Circuit | |
| 8. VC output circuit | VC OUTPUT CIRCUIT | |
| No complete combustion (Does not start) | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Spark plug | ON-VEHICLE INSPECTION | |
| 3. Immobiliser system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 4. Injector | INSPECTION | |
| 5. Crankshaft position sensor circuit | DTC P0335 Crankshaft Position Sensor "A" Circuit | |
| Engine cranks normally but difficult to start | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Compression | ON-VEHICLE INSPECTION | |
| 3. Spark plug | ON-VEHICLE INSPECTION | |
| 4. Injector | INSPECTION | |
| 5. Crankshaft position sensor circuit | DTC P0335 Crankshaft Position Sensor "A" Circuit | |
| Difficult to start with cold engine | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Spark plug | ON-VEHICLE INSPECTION | |
| 3. Injector | INSPECTION | |
| 4. Crankshaft position sensor circuit | DTC P0335 Crankshaft Position Sensor "A" Circuit | |
| Difficult to start with hot engine | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Spark plug | ON-VEHICLE INSPECTION | |
| 3. Injector | INSPECTION | |
| 4. Crankshaft position sensor circuit | DTC P0335 Crankshaft Position Sensor "A" Circuit | |
| High engine idle speed (Poor idling) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. Electronic throttle control system | DTC P2102 Throttle Actuator Control Motor Circuit Low; DTC P2103 Throttle Actuator Control Motor Circuit High | |
| Low engine idle speed (Poor idling) | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Electronic throttle control system | DTC P2102 Throttle Actuator Control Motor Circuit Low; DTC P2103 Throttle Actuator Control Motor Circuit High | |
| 3. Injector | INSPECTION | |
| Rough idling (Poor idling) | 1. Compression | ON-VEHICLE INSPECTION |
| 2. Electronic throttle control system | DTC P2102 Throttle Actuator Control Motor Circuit Low; DTC P2103 Throttle Actuator Control Motor Circuit High | |
| 3. Injector | INSPECTION | |
| 4. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 5. Spark plug | ON-VEHICLE INSPECTION | |
| Hunting (Poor idling) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. Electronic throttle control system | DTC P2102 Throttle Actuator Control Motor Circuit Low; DTC P2103 Throttle Actuator Control Motor Circuit High | |
| 3. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Hesitation/Poor acceleration (Poor driveability) | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Injector | INSPECTION | |
| 3. Spark plug | ON-VEHICLE INSPECTION | |
| 4. HV transaxle | - | |
| Surging (Poor driveability) | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Spark plug | ON-VEHICLE INSPECTION | |
| 3. Injector | INSPECTION | |
| Engine stalls soon after starting | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. Electronic throttle control system | DTC P2102 Throttle Actuator Control Motor Circuit Low; DTC P2103 Throttle Actuator Control Motor Circuit High | |
| 3. Immobiliser | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 4. Crankshaft position sensor circuit | DTC P0335 Crankshaft Position Sensor "A" Circuit | |
| Unable to refuel/Difficult to refuel | 1. ORVR system | - |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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