Test NTC-4A - Checking Coolant Sensor Calibration
WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform TEST NTC-1A
before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION
at beginning of article. For wiring diagrams, see WIRING DIAGRAMS
at the end of this article. Perform TEST VER-2A
after each repair.
- Start engine. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If ECT sensor temperature is more than 180°F (82°C), stop engine. Allow engine coolant to cool to 150°F (66°C). Start engine. Allow engine to reach normal operating temperature of 180°F (82°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value does not increase smoothly, inspect cooling system for mechanical failure. If cooling system is okay, replace ECT sensor.
- If ECT sensor value does not reach 180°F (82°C) or more, inspect cooling system for mechanical failure. If system is okay, replace ECT sensor. If ECT sensor value reaches 180°F (82°C) or more, ECT sensor is functioning properly. Test is complete.