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ENGINE COOLANT DESCRIPTION The 0–5 volt input from this sensor tells the ECM and PCM the temperature of the engine coolant. The sensor is located on the side of the #3 cylinder head near the rear of fuel injection pump (Fig. 4). ENGINE COOLANT TEMPERATURE SENSOR For a list of Diagnostic Trouble Codes (DTC’s) for certain fuel system components, refer to On-Board (1) Disconnect wire harness connector from coolant temperature sensor. (2) Test the resistance of the sensor with a high input impedance (digital) volt–ohmmeter. The resis- (3) Test continuity of the wire harness. Do this between the ECM wire harness connector and the sensor connector terminal. Also test continuity of (4) After tests are completed, connect electrical connector to sensor. GLOW PLUGS DESCRIPTION Glow plugs are used to help start a cold or cool engine. The plug will heat up and glow to heat the Each plug will momentarily draw approximately 25 amps of electrical current during the initial key–on Total momentary current draw for all four plugs is approximately 100 amps on a cold engine dropping to Electrical operation of the glow plugs are con- trolled by the glow plug relay. Refer to the previous DIAGNOSIS AND TESTNG - GLOW PLUGS Hard starting or a rough idle after starting may be caused by one or more defective glow plugs. Before Fig. 4 Engine Coolant Temperature Sensor Location 1 - PCM ENGINE COOLANT TEMPERATURE (ECT) SENSOR Fig. 5 Glow Plug 1 - GLOW PLUG 14a - 22 FUEL INJECTION R1 |