2005 Toyota 4Runner Sport, 4.7 T, RWDFACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

PROBLEM SYMPTOMS

Symptom Suspected Area
Engine does not crank (Does not start) 1. Cranking holding function circuit
2. Starter
3. Starter relay
No initial combustion (Does not start) 1. ECM power source circuit
2. Fuel pump control circuit
3. ECM
No complete combustion (Does not start) 1. Fuel pump control circuit
Difficult to start (Engine cranks normally) 1. Starter signal circuit
2. Fuel pump control circuit
3. Compression
Difficult to start (With cold engine) 1. Starter signal circuit
2. Fuel pump control circuit
Difficult to start (With hot engine) 1. Starter signal circuit
2. Fuel pump control circuit
High engine idle speed (Poor idling) 1. A/C signal circuit (Compressor circuit)
2. ECM power source circuit
Low engine idle speed (Poor idling) 1. A/C signal circuit (Compressor circuit)
2. Fuel pump control circuit
Rough idling (Poor idling) 1. Compression
2. Fuel pump control circuit
Hunting (Poor idling) 1. ECM power source circuit
2. Fuel pump control circuit
Hesitation/Poor acceleration (Poor driveability) 1. Fuel pump control circuit
2. A/T faulty
Surging (Poor driveability) 1. Fuel pump control circuit
Engine stalls soon after starting 1. Fuel pump control circuit
Engine stalls during A/C operation 1. A/C signal circuit (Compressor circuit)
2. ECM
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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