No, all that the sensor does is look at the level in the surge tank. That is why it goes out when you added coolant.
The Coolant Level Sensor is a solid state module that monitors coolant level. It is located at the right hand radiator tank, and senses coolant by means of two probes that protrude into the coolant.
When the coolant is at the proper level, the coolant level signal at the ECM is pulled low (0-3 volts). When the coolant level is low, the signal at the ECM will be high (4-5 volts) and the ECM will turn "ON" the low coolant light.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
1. This test will confirm if the coolant light is "ON" because of low coolant, and if Codes 14, 26, or 32 are "ON". They should be repaired first because they share common grounds.
2. This test confirms that the ECM is controlling the coolant level light. By jumpering CKT 69 to ground, this will pull the ECM signal low and turn out the coolant light. This confirms that the sensor ground CKT 452 is open between the ECM and coolant level sensor.
3. If customer complaint was "light never comes "ON", this test will determine if it is ECM or bulb check circuit related.
The coolant level sensor shares a common sensor ground (CKT 452) with the EGR, map and coolant temperature sensor, an intermittent at any of these connections could cause the coolant level light to come "ON". If coolant level was low, and light was not "ON, " or owners complaint was "light never comes "ON" with low coolant, " replace sensor.
Thursday, June 25th, 2020 AT 12:18 PM