Chrysler 56004815 Sensor-COOLANT Temperature

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For the crankshaft reference sensor, unplug the electrical connector, loosen the retaining bolt, remove the sensor, and if reinstalling, remove the old spacer and install a new one.

The throttle position sensor (TPS) helps the ECM determine fuel delivery based on the angle of the throttle valve. Its resistance is tested using an ohmmeter. The resistance should be progressive as you move the throttle. An inconsistent resistance reading may indicate a faulty TPS.

Information sensors provide data on engine conditions, aiding in fuel economy and emission reduction. The oxygen sensor in the exhaust manifold measures oxygen content in the exhaust, adjusting the fuel/air mixture. The knock sensor detects engine detonation, retarding ignition timing. The coolant temperature sensor monitors temperature for fuel/air mixture adjustments. The manifold absolute pressure sensor reads pressure changes to vary the air/fuel mixture. The manifold air temperature sensor measures air temperature for fuel/air adjustments. The crankshaft position sensor detects engine speed for ignition timing and fuel control. The vehicle speed sensor determines vehicle speed.

The coolant temperature indicator system includes a dashboard light or gauge and a sending unit on the engine. Some vehicles have multiple sending units, but only one is used for the indicator. If the car has an electric cooling fan, avoid the fan blades as they can start unexpectedly. If overheating is indicated, check the coolant level, ensure secure wiring between the light/gauge and sending unit, and check all fuses. To test, ground the wire to the sending unit with the ignition on. Once the engine starts, the light should go out unless the engine overheats. If it doesn't, it could be a grounded wire, defective sending unit, or faulty ignition switch. Check the coolant type, as plain water may not activate the sending unit. If replacing the sending unit, unscrew it from the engine and install the replacement with sealant on the threads. Let the engine cool before removal and expect some coolant loss. Check the coolant level after replacement.

Failure of the light to go out when the engine starts may be caused by a grounded wire, defective sending unit, or faulty ignition switch.