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Symptom
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Diagnostic Procedure
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Also check for
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Engine overheats
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1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
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Check the coolant level.
Check for any engine coolant leakage (from gaskets, hoses, O-rings, etc.).
Check for dirt, leaves, or insects on radiator and condenser.
Check for deteriorated coolant.
Check for a damaged or deformed fan shroud.
Check for a plugged or deteriorated radiator hoses.
Check for plugged heater core or hoses.
Check for a damaged cylinder head gasket.
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The A/C condenser fan runs at low speed, but it does not run at high speed when the engine coolant temperature is above 96.5 °C (206 °F)
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Cleanliness and tightness of all connectors
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With the A/C off (if equipped) and the engine coolant temperature at 96.5 °C (206 °F) or below, the radiator fan runs at high speed and the A/C condenser fan does not run. When the engine coolant temperature is above 96.5 °C (206 °F), both fans run at high speed
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Remove the fan control relay, and test.
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Cleanliness and tightness of all connectors
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Both the radiator fan and the A/C condenser fan run at high speed with the ignition switch ON (II), the A/C off (if equipped), and the engine coolant temperature below 94.5 °C (202 °F)
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Check for a short in the wire between under-hood fuse/relay box connector No. 3 terminal No. 4 and ECM connector terminal A5.
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Cleanliness and tightness of all connectors
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Both the radiator fan and the A/C condenser fan run at low speed with the ignition switch ON (II) and the A/C off (if equipped)
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Check for a short in the wire between under-hood fuse/relay box connector No. 3 terminal No. 5 and ECM connector terminal A4.
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Cleanliness and tightness of all connectors
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With A/C: Both the radiator fan and the A/C condenser fan do not run at low speed with the A/C on
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Cleanliness and tightness of all connectors
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Both the radiator fan and the A/C condenser fan run at low speed, but radiator fan does not run at high speed when the engine coolant temperature is above 96.5 °C (206 °F)
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Cleanliness and tightness of all connectors
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Both the radiator fan and the A/C condenser fan do not run at high speed when the engine coolant temperature is above 96.5 °C (206 °F)
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Check for an open in the wire between under-hood fuse/relay box connector No. 3 terminal No. 4 and ECM connector terminal A5.
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Cleanliness and tightness of all connectors
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