The optical Coolant Level Sensor (CLS) can be used in place of the standard coolant level sensor
in applications where electrical isolation from the chassis is required. See Figure 3-37.
The optical CLS does not have a connection to the chassis but uses the angle of refraction of light emitted from the probe to determine if the sensor is in or out of the coolant. See Figure 3-38 for a schematic of the optical CLS harness.
This sensor is to be used with DDEC III or DDEC IV only.
The optical CLS connects to the engine interface harness quick disconnect connector on many multi-ECM engines. Refer to section 2.3.7.
The sensor part numbers are listed in Table 3-9.