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 Lexus RX 330 AWDFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
SFI SYSTEM
PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | Proceed to |
|---|---|---|
| Engine does not crank (does not start) | 1. Starter | STARTER |
| 2. Starter relay | STARTER RELAY | |
| 3. Park/neutral position switch | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 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. ECM | REMOVAL | |
| No complete combustion (does not start) | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Difficult to start (engine cranks normally) | 1. Starter signal circuit | DTC P0617 Starter Relay Circuit High |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| 3. Compression | ON-VEHICLE INSPECTION | |
| Difficult to start with cold engine | 1. Starter signal circuit | DTC P0617 Starter Relay Circuit High |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Difficult to start with hot engine | 1. Starter signal circuit | DTC P0617 Starter Relay Circuit High |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| High engine idle speed (poor idling) | 1. A/C signal circuit (compressor circuit) | A/C SIGNAL CIRCUIT (COMPRESSOR CIRCUIT) |
| 2. ECM power source circuit | ECM POWER SOURCE CIRCUIT | |
| Low engine idle speed (poor idling) | 1. A/C signal circuit (compressor circuit) | A/C SIGNAL CIRCUIT (COMPRESSOR CIRCUIT) |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Rough idling (poor idling) | 1. Compression | ON-VEHICLE INSPECTION |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Hunting (poor idling) | 1. ECM power source circuit | ECM POWER SOURCE CIRCUIT |
| 2. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT | |
| Hesitation/Poor acceleration (poor driveability) | 1. Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| 2. A/T faulty | DIAGNOSTIC TROUBLE CODE CHART | |
| Surging (poor driveability) | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Engine stalls soon after starting | Fuel pump control circuit | FUEL PUMP CONTROL CIRCUIT |
| Engine stalls during A/C operation | 1. A/C Signal circuit (compressor circuit) | A/C SIGNAL CIRCUIT (COMPRESSOR CIRCUIT) |
| 2. ECM | REMOVAL | |
| Unable to refuel/Difficult to refuel | 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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