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Home >> Dodge and Ram >> 2000 >> Durango 4.7 N, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self Diagnostics >> Diagnostic Tests >> Test NTC-10: Checking Engine Coolant Temperature (ECT) Sensor

Test NTC-10: Checking Engine Coolant Temperature (ECT) Sensor

  1. Cooling system and thermostat must be operating properly when performing this test procedure. Turn ignition on with engine off. Using scan tool in SENSORS mode, read ENG COOLANT TMP DEG. This is the engine coolant temperature value for ECT sensor. If engine coolant temperature is more than 180°F (82°C), allow engine to cool until engine coolant temperature is 150°F (66°C). Start engine and allow engine to idle. Using scan tool in SENSORS mode, read ENG COOLANT TMP DEG again while warming engine to normal operating temperature. The ENG COOLANT TMP DEG reading on scan tool should increase in a smooth transition as engine coolant temperature increases and temperature should become at least 180°F (82°C). If ENG COOLANT TMP DEG reading on scan tool increases in a smooth transition as engine coolant temperature increases and temperature becomes at least 180°F (82°C), shut engine off. Go to next step. If ENG COOLANT TMP DEG reading on scan tool does not increase in a smooth transition as engine coolant temperature increases or temperature does not become at least 180°F (82°C), shut engine off. Replace ECT sensor. On 4.7L, ECT sensor is located near front of intake manifold and contains Black/Light Blue wire and Tan/Black wire in the connector. On 5.2L and 5.9L, ECT sensor is located near thermostat housing on intake manifold and contains Black/Light Blue wire and Tan/Black wire in the connector. On all models, perform TEST VER-5  .
  2. Turn ignition off. Inspect wiring harness and connectors between ECT sensor and Powertrain Control Module (PCM). On 4.7L, ECT sensor is located near front of intake manifold and contains Black/Light Blue wire and Tan/Black wire in the connector. On 5.2L and 5.9L, ECT sensor is located near thermostat housing on intake manifold and contains Black/Light Blue wire and Tan/Black wire in the connector. On all models, PCM is located at passenger's side front corner of engine compartment on inner fender panel. Inspect ECT sensor connector and PCM connectors for corroded, pushed out, miswired or damaged terminals. Also, check for related Technical Service Bulletins (TSBs). If no problems and no related TSBs exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-5  .
  3. Start engine and allow engine to idle. Wiggle wiring harness and connectors between PCM and ECT sensor while noting GOOD TRIP counter. If GOOD TRIP counter does not change to zero, test is complete. If GOOD TRIP counter changes to zero while wiggling wiring harness and connectors, repair wiring or connectors as necessary. Perform TEST VER-5  .
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