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Home >> Lexus >> 2004 >> RX 330 FWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Cooling System >> Cooling Fan System >> Problem Symptoms Table

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE - COOLING SYSTEM

Symptom Suspected Area
Cooling fan is malfunctioning
  1. Cooling fan motor(s)
  2. Cooling fan ECU(1),(2)
  3. Wire harness (ECM (RFC) to cooling fan ECU (SI)) (3)
  4. Wire harness (Power distributor (FCL) to cooling fan ECU (+B))
  5. Wire harness (Power distributor (FCB) to cooling fan fuse) (4)
(1) Terminal SI of the cooling fan ECU is faulty, inspect the wire harness.

(2) Terminal +B of the cooling fan ECU is faulty, inspect the wire harness.

(3) If the wire harness is normal, replace the ECM.

(4) If the wire harness is normal, inspect the power distributor (See INSPECTION).
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