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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Engine Controls - Tests W/Codes - 5.9L Gasoline) >> Self-Diagnostic Tests >> Test NTC-4A - Checking Coolant Sensor Calibration

Test NTC-4A - Checking Coolant Sensor Calibration

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If ECT sensor temperature is more than 180°F (82°C), allow engine coolant to cool to 150°F (66°C). Start engine. Allow engine to reach normal operating temperature of more than 180°F (82°C). If ECT sensor value does not increase smoothly, repair cooling system as necessary and replace ECT sensor. Perform TEST VER-2. If ECT sensor value increases smoothly, go to next step.
  2. If ECT sensor value did not reach 180°F (82°C) or more, repair cooling system as necessary and replace ECT sensor. Perform TEST VER-2. If ECT sensor value reached 180°F (82°C) or more, system is functioning properly. Test is complete.
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