6-24T-268-07position the enlarged positioning section of thesensor against the the side of the mounting clamp.NOTEThe P5 Pre-Trip test must be run to inactivatethe alarm (refer to section 3.2.1).Evaporator GrilleReturn SensorMounting ClampEnlarged Positioning(Plastic) SectionFigure 6-24. Return Sensor Positioning6.23.4 Checking Sensor (AMBS or DTS)a. Turn unit OFF and disconnect power supply.b. Refer to section 6.27 for removal of the Controllermodule.AMBS or DTS:Using the plug connector marked “EC” that isconnected to the Controller module. Locate the wiresmarked AMBS or DTS, depending on which sensorneeds to be replaced. Follow that wire to the connectorand using the pins of the plug, measure the ohmsresistance. Readings are shown in Table 6-1.6.23.5 Replacing Sensor (AMBS or DTS)a. Turn unit power OFF and disconnect power supply.b. Cut wires to 25.4 cm (10 inches) from the back ofthe mounting stud of the defective sensor anddiscard.c. Cut one of the two wires from step b 25.4 mm (1.0inch) shorter than the other wire.d. Cut one replacement sensor wire back 25.4 mm (1.0inch). (See Figure 6-25.)e. Strip back insulation on all wiring 6.35mm (1/4inch).Sensor 25.4 mm (1.0 inch)6.35mm (1/4 inch)Mounting StudFigure 6-25. Sensor (AMBS or DTS)f. Slide two small pieces of heat shrink tubing overeach wire before adding crimp fittings as shown inFigure 6-26.g. Slip crimp fittings over dressed wires. Make surewires are pushed into crimp fittings as far aspossible and crimp with crimping tool.h. Solder spliced wires with a 60% tin and 40% leadRosincore solder.i. Slide heat shrink tubing over splice so that bothends of tubing cover both ends of crimp as shown inFigure 6-26.SensorHeat ShrinkTubing (2)Crimp FittingCrimp FittingFigure 6-26. Sensor and Wire Assembly(AMBS or DTS)j. Heat tubing, preferably with a flameless heat gun. Ifnot available, a propane torch will work (cautionshould be taken not to burn the heat shrink tubing orwire insulation). Make sure all seams are sealedtightly against the wiring to prevent moistureseepage.CAUTIONDo not allow moisture to enter wire splicearea as this may affect the sensor resistance.k. Secure sensor to unit and check sensor resistance asdetailed in section 6.23.4.NOTEThe DTS sensor must have “Presstite”insulating material placed completely over thesensor to insure proper function of the sensor.
