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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Engine Controls Self-Diagnostics - 6.5L) >> Diagnostic Tests >> DTC P0126: Insufficient ECT For Stable Operation >> Diagnostic Aids

Diagnostic Aids

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    NOTE: The system must be rechecked on a cold start.
  1. Using the Freeze Frame/Failure Records data may aid in locating an intermittent condition. If the DTC cannot be duplicated, the Freeze Frame/Failure Records data can be used to determine how many miles were driven since the DTC set. The Fail Counter and Pass Counter can also be used to determine how many ignition cycles the diagnostic test reported a pass and/or a fail. Operate the vehicle within the same Freeze Frame conditions that existed when the condition was noted. These conditions may include RPM, load, vehicle speed, temperature, or others. This procedure will help to isolate when the DTC failed.
  2. If other DTCs are set that share the same ground and/or 5-volt reference circuit, check for faulty connections and for faulty wiring.
  3. If the engine has been allowed to sit overnight, the engine coolant temperature and the intake air temperature values should display within a few degrees of each other.
  4. If the engine coolant temperature exceeds 140°F (60°C), this indicates that the engine is capable of reaching the proper temperature, but not necessarily in the correct amount of time. This diagnostic table must be repeated on a cold engine, with the engine coolant temperature and the intake air temperature less than 122°F (50°C) and within 5°F (3°C) of each other. The time required to reach the temperature threshold must be measured. When starting a cold engine, measure the amount of time the engine takes to reach the specified temperature. The engine should reach the specified temperature within 8 minutes. If the specified temperature is not reached within 7 minutes, check the following items:
    • The coolant level
    • The thermostat operation
    • The cooling fan
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