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.
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HOMESERVICE MANUALSTOYOTA20064RUNNER SR5, 4.7 T, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SFI (2UZ-FE) - DIAGNOSTICS - INTRODUCTIONPROBLEM SYMPTOMS TABLE
2006 Toyota 4Runner SR5, 4.7 T, AWD
Problem Symptoms Table
2006 Toyota 4Runner SR5, 4.7 T, AWDSECTION Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
| Symptom | Suspected Area | Reference |
|---|---|---|
| Engine does not crank (Does not start) | 1. Cranking holding function circuit | CRANKING HOLDING FUNCTION CIRCUIT |
| 2. Starter | STARTING SYSTEM (2UZ-FE) | |
| 3. Starter relay | STARTING SYSTEM (2UZ-FE) | |
| 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 | ECM | |
| No complete combustion (Does not start) | 1. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT |
| Difficult to start (Engine cranks normally) | 1. Starter Signal Circuit | STARTER SIGNAL CIRCUIT |
| 2. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT | |
| 3. Compression | ENGINE (2UZ-FE) | |
| Difficult to start (With cold engine) | 1. Starter Signal Circuit | STARTER SIGNAL CIRCUIT |
| 2. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT | |
| Difficult to start (With hot engine) | 1. Starter Signal Circuit | STARTER SIGNAL CIRCUIT |
| 2. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT | |
| High engine idle speed (Poor idling) | 1. A/C signal circuit (Compressor 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) | COMPRESSOR CIRCUIT |
| 2. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT | |
| Rough idling (Poor idling) | 1. Compression | ENGINE (2UZ-FE) |
| 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 | - | |
| Surging (Poor driveability) | 1. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT |
| Engine stalls soon after starting | 1. Fuel Pump Control Circuit | FUEL PUMP CONTROL CIRCUIT |
| Engine stalls during A/C operation | 1. A/C signal circuit (Compressor circuit) | COMPRESSOR CIRCUIT |
| 2. ECM | ECM | |
| Unable to refuel/Difficult to refuel | 1. ORVR system | - |
RENDER: 1.0x
NO RELATED
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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.