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Home >> Chevrolet >> 1987 >> Nova CL, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Feedback Carburetor CEC System >> Servicing >> Cold Mixture Heater System >> System Check
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System Check

  1. Start engine. Check CMH with coolant temperature below 109°F (43°C). Using a voltmeter, check that there is voltage between positive terminal (White/Red wire color) and ground.
    CAUTION: Voltmeter should be inserted from rear side of connector.
  2. Warm engine to above 131°F (55°C). Check that there is no voltage. If no problem is found with this check, system is okay; otherwise inspect each part.
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