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Home >> Suzuki >> 2009 >> XL7 Luxury, AWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P1258: Engine Coolant Overtemperature - Protection Mode Active >> Circuit/System Verification
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Circuit/System Verification

  1. If DTC P0480 or P0481 are set, diagnose those DTCs first.
  2. Observe the engine coolant level. The engine coolant level should be within the operating range. Refer to Capacities - Approximate Fluid, and Engine Coolant in the Owner's Manual.
  3. Ensure that the vehicle has the correct engine coolant with correct concentration and is not old, contaminated, or contains additives. Refer to Recommended Fluids and Lubricants in the Owner's Manual.
  4. Inspect the cooling system for the following:
    • Leaks
    • Kinked or pinched hoses, especially at the radiator
    • Loose, missing, or damaged radiator air seals or deflectors
    • Air flow obstructions or bent fins at the radiator or the A/C condenser. Refer to SYMPTOMS - ENGINE COOLING .
      NOTE: A small delay occurs before the ECM changes the cooling fan speed.
  5. Command the cooling fans ON and OFF, low and high speed. The engine cooling fans should turn ON and OFF with each command.
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