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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Controls - Self-Diagnostics - 1.8L) >> Diagnostic Tests >> DTC P0128: Coolant Thermostat Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Check thermostat operation. If problem is found, replace thermostat as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  3. Drain coolant. Remove ECT sensor from thermostat housing and place in water with a thermometer. Heat water to specified temperature and check resistance. See Figure . If sensor resistance is not as specified, replace ECT sensor. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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