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(P0128) FORCED LIMITED POWER EXCESSIVE HIGH COOLANT TEMP (CONTINUED) 2. LOW COOLANT LEVEL Note: If any ECT or Radiator Fan Control Module DTCs have set Note: If a Engine Coolant Temperature (ECT) DTC is set along Note: Inspect the ECT terminals and related PCM terminals. Note: The best way to diagnose this DTC is to allow the vehicle WARNING: NEVER OPEN THE COOLING SYSTEM WHEN THE Is the coolant level and condition OK? Yes >> Go To 3 No >> Inspect the vehicle for a coolant leak and add the necessary amount of coolant. Perform POWERTRAIN VERIFICATION TEST VER - 2. 3. THERMOSTAT OPERATION Note: This test works best if performed on a cold engine (cold With the DRBIII T , read the ENG COOLANT TEMP value. If the engine was allowed to sit overnight (cold soak), the temperature value should Note: If engine coolant temperature is above 82°C (180°F), allow During engine warm-up, monitor the ENG COOLANT TEMP value. Note: As the engine warms up to operating temperature, the actual coolant temperature (thermometer read- T should stay relatively close to each other. Using the appropriate service information, determine the proper opening temperature of the thermostat. Did the thermostat open at the proper temperature? Yes >> Go To 4 No >> Replace the thermostat. (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT THERMOSTAT - REMOVAL). Perform POWERTRAIN VERIFICATION TEST VER - 2. ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 113 |