TM 1-2840-252-23-3
G-28
FAULT CODE A3, COLLECTIVE PITCH ANGLE LVDT EXPANDED INSTRUCTIONS
Refer to numbered steps in figure 114.
Step 2.
Check harness connector PL3 (figure 201) at DECU and LVDT for tight connections.
Step 3.
Disconnect connector PL3 and LVDT to check pins and sockets.
Step 5.
With LVT connector disconnected, check r sistance of RTL sensor at sensor connector pins 1 and 2. Limit is
e
110 140Ω. Check resistance at pins 3 and 4. Limit is 210 260Ω.. Check resistance at pins 3 and 5, and pins
4 and 5. Limit is < 230Ω.
Step 6.
Before tightening harness connector PL3 and LVDT connector, be sure that keyway in harness connectors is
aligned with keyways in component connectors.
With PL3 disconnected, check resistance of RTL sensor at harness PL3 connector sockets and p (figure
Step 9.
q
Step 10.
Refer to manufacturer's procedure for checking operation of RTL sensor.
Step 13.
Refer to manufacturer's procedure for diagnosing and replacing harness or RTL sensor.
Step 15.
Refer to manufacturer's procedure for diagnosing and replacing harness.
Step 17.
Refer to manufacturer's procedure for diagnosing and replacing RTL sensor.
RESISTANCE-CHECK SUMMARY
Resistance (Ω)
Connector
Component
No.
Contacts
Limits
Nominal*
RTL Sensor C/P Signal
LVDT
3&4
210 - 26-
225
<230
3&5
-
<230
4&5
-
C/P Excitation
PL3
q&p
210 - 260
-
*At 25
z & AA
110 - 140
120
C
G-56
