TM 9-2320-363-20-1
Table 3-1. Troubleshooting (Cont)
Malfunction
Test or inspection
Corrective action
POWER TAKE-OFF (PTO) CIRCUITS (ALL EXCEPT M915A2) (CONT)
2. POWER TAKE-OFF INDICATOR LIGHT DOES NOT OPERATE.
Step 1.
Check power take-off indicator lamp.
If defective, replace power take-off indicator lamp (page 4-200).
If not defective, go to step 2.
Step 2.
Disconnect lead 200F from power take-off pressure switch. Check for
+12 VDC at lead 200F.
If +12 VDC is present, go to step 3. If no voltage is present,
repair lead 200F (page 3-2).
Step 3.
Disconnect lead 200F and lead 200 from power take-off pressure switch.
Check for continuity between contact at power take-off pressure switch.
If continuity is indicated, go to step 4. If no continuity is
indicated, replace power take-off pressure switch (page 4-768).
Step 4.
Disconnect lead 200 from power take-off indicator light. Check for +12 VDC
at lead 200.
If +12 VDC is present, go to step 5. If no voltage is present, X,
repair lead 200 (page 3-2).
Step 5.
Remove power take-off indicator light lamp. Check for continuity between
socket and ground.
If no continuity is indicated, repair ground lead (page 3-2).
3. POWER TAKE-OFF (PTO) RPM CONTROL DOES NOT OPERATE.
Step 1.
Disconnect power take-off neutral lockout relay from connector. Check for
+12 VDC at connector 85.
If +12 VDC is present, go to step 2. If no voltage is present,
repair lead 15D (page 3-2).
Step 2.
Disconnect power take-off neutral lockout relay from connector. Check for
+12 VDC at connector 30.
If +12 VDC is present, go to step 3. If no voltage is present,
go to next corrective action.
Disconnect lead D510 from pin R of DDEC engine harness
connector. Check for continuity between connector 30 and
lead D510. If continuity is not indicated, repair lead D510
(page 3-2). If continuity is indicated, refer to DDEC II
troubleshooting (page 3-101).
3-82 Change 3
