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Possible Causes ECT SENSOR - COLD ECT SENSOR - HOT Diagnostic Test 1. ECT SENSOR - COLD NOTE: The thermostat must be operating correctly for this test to be valid. Using a temperature probe, measure the engine block temperature near the ECT Sensor. NOTE: The engine temperature should be below 50°C (120°F). Are the readings within 7°C (13°F) of each other? Yes >> Go To 2 No >> Check the wiring and connectors associated with the ECT Sensor for corrosion, damage or other prob- lems. Repair as necessary. If wiring and connectors are o.k., replace the Engine Coolant Temperature Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 2. ECT SENSOR - HOT NOTE: The thermostat must be operating correctly for this test to be valid. Turn the engine off and wait 10 minutes to allow the engine temperature to stabilize. Using a temperature probe, measure the engine block temperature near the ECT Sensor. Using the Scan Tool, read the engine coolant temperature. Are the readings within 7°C (13°F) of each other? Yes >> Test Complete. No >> Check the wiring and connectors associated with the ECT Sensor for corrosion, damage or other prob- lems. Repair as necessary. If wiring and connectors are o.k., replace the Engine Coolant Temperature Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). 9 - 658 ENGINE DIESEL DIAG KJ |