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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Self-Diagnostics - 1.6L) >> 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. Check for high resistance or poor connection in ECM harness connector terminals. If problem is found, repair as necessary. 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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