Repair
44 309574L
Fluid Temperature Sensor
(FTS)
Test/Removal
2. Relieve pressure, page 9.
3. Remove tape and protective covering from FTS (X),
F
IG. 18. Disconnect hose cable (F). Test with ohm-
meter between pins of cable connector.
4. If FTS fails test, replace FTS.
5. Disconnect air hoses (C, L), and electrical connec-
tors (D).
6. Disconnect FTS from whip hose (W) and fluid hoses
(A, B).
7. Remove ground wire (K) from ground screw on
underside of FTS.
8. Remove FTS probe (H) from component A (ISO)
side of hose.
Installation
1. Carefully extend FTS probe (H). Do not bend or kink
probe. Insert in component A (ISO) side of main
hose.
2. Connect whip hose ground wire (K) to ground screw
on underside of FTS.
3. Install FTS in reverse order of removal. Leave slack
(G) in cables as stress relief, to prevent cable failure.
4. Secure hose and cable connections with tape and
install protective covering.
SCR Circuit check – ON position:
1. Ensure that all harnesses, cables, and connectors
are properly connected. Connect hose.
2. Connect power supply. Turn main power ON .
3. Set hose heat target temperature above
ambient
hose temperature
4. Turn on heat zone by pressing .
5. Carefully measure the voltage at the white Ander-
son connector for the hose.
You should read:
50’ = 20 VAC
100’ = 34 VAC
150’ = 48 VAC
200’ = 62 VAC
250’ = 76 VAC
300’ = 90 VAC
SCR Circuit check - OFF position
1. Ensure that all harnesses, cables, and connectors
are properly connected. Connect hose.
2. Connect power supply. Turn main power ON .
3. Set hose heat target temperature below
ambient
hose temperature.
1. Turn main power OFF . Disconnect power
supply.
Pins Result
1 to 2 approximately 10 ohms
1 to 3 infinity (∞)
3 to FTS groundscrew 0 ohms
1 to FTS component A
fitting (ISO)
infinity (∞)
CAUTION
To prevent damage to probe, do not kink or exces-
sively bend whip hose. Do not coil hose tighter than
the minimum bend radius of 3 ft (0.9 m). Do not sub-
ject hose to excessive weight, impact, or other abuse.
WARNING
Read warnings, page 6. Step 5 measures line voltage
and should be done by a qualified electrician. If work is
not performed properly it may cause electric shock or
other serious injury.
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