position the enlarged positioning section of the sensor against the the side of the mounting clamp.
NOTE
The P5
Evaporator Grille
Return Sensor
Enlarged Positioning
(Plastic) Section
Mounting Clamp
Figure 6-24. Return Sensor Positioning
6.23.4 Checking Sensor (AMBS or DTS)
a.Turn unit OFF and disconnect power supply.
b.Refer to section 6.27 for removal of the Controller module.
AMBS or DTS:
Using the plug connector marked “EC” that is connected to the Controller module. Locate the wires marked AMBS or DTS, depending on which sensor needs to be replaced. Follow that wire to the connector and using the pins of the plug, measure the ohms resistance. Readings are shown in Table
6.23.5Replacing 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 of the mounting stud of the defective sensor and discard.
c.Cut one of the two wires from step b 25.4 mm (1.0 inch) shorter than the other wire.
d.Cut one replacement sensor wire back 25.4 mm (1.0 inch). (See Figure
e.Strip back insulation on all wiring 6.35mm (1/4 inch).
Sensor | 25.4 mm (1.0 inch) |
| |
Mounting Stud | 6.35mm (1/4 inch) |
|
Figure 6-25. Sensor (AMBS or DTS)
f.Slide two small pieces of heat shrink tubing over each wire before adding crimp fittings as shown in Figure
g.Slip crimp fittings over dressed wires. Make sure wires are pushed into crimp fittings as far as possible and crimp with crimping tool.
h.Solder spliced wires with a 60% tin and 40% lead Rosincore solder.
i.Slide heat shrink tubing over splice so that both ends of tubing cover both ends of crimp as shown in Figure
Sensor | Crimp Fitting |
|
Heat Shrink
Crimp FittingTubing (2)
Figure 6-26. Sensor and Wire Assembly
(AMBS or DTS)
j.Heat tubing, preferably with a flameless heat gun. If not available, a propane torch will work (caution should be taken not to burn the heat shrink tubing or wire insulation). Make sure all seams are sealed tightly against the wiring to prevent moisture seepage.
CAUTION
Do not allow moisture to enter wire splice area as this may affect the sensor resistance.
k.Secure sensor to unit and check sensor resistance as detailed in section 6.23.4.
NOTE
The DTS sensor must have “Presstite” insulating material placed completely over the sensor to insure proper function of the sensor.
|
