3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
ENGINE COOLANT TEMPERATURE SENSOR - DIESEL ENGINE
To perform a complete test of the Engine Coolant Temperature (ECT) sensor and its circuitry, refer to DRB scan tool and appropriate Powertrain
Diagnostics Procedures. To test the sensor only, refer to the following:
The ECT sensor is located on the left side of cylinder head behind fuel filter and below the intake manifold.
1. The ECT sensor is equipped with a 9 inch long jumper harness. This harness connects the ECT sensor to the main engine wiring harness. The end
of the harness is located near the top of the fuel filter. It is used for sensor tests. Disconnect jumper harness connector from main engine wiring
harness.
2. Test the resistance of the sensor with a high input impedance (digital) volt- ohmmeter. The resistance (as measured across the jumper harness
terminals) should be as shown in the ECT Sensor Resistance (Ohms) chart. Replace the sensor if it is not within the range of resistance specified
in the chart.
