2008 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

When the malfunction is not confirmed in the diagnostic trouble code check and the problem still cannot be confirmed in the basic inspection, use this table and troubleshoot according to the priority order given below.

SFI SYSTEM: 

SYMPTOMS REFERENCE

Symptom Suspected Area See page
Engine does not crank (Does not start) 1. No. 1 Motor generator -
2. Hybrid control system HV-20
3. Immobilizer system EI-5
4. Smart key system ST-65
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 IG-5
4. Immobilizer system EI-5
5. Injector FU-15
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 IG-5
3. Immobilizer system EI-5
4. Injector FU-15
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 EM-1
3. Spark plug IG-5
4. Injector FU-15
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 IG-5
3. Injector FU-15
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 IG-5
3. Injector FU-15
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 FU-15
Rough idling (Poor idling) 1. Compression EM-1
2. Electronic throttle control system DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW; DTC P2103 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT HIGH 
3. Injector FU-15
4. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
5. Spark plug IG-5
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 FU-15
3. Spark plug IG-5
4. HV transaxle -
Surging (Poor driveability) 1. Fuel pump control circuit FUEL PUMP CONTROL CIRCUIT 
2. Spark plug IG-5
3. Injector FU-15
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. Immobilizer EI-5
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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