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Table 4-2. Unit Troubleshooting-continued -706880233
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Table 4-2. Unit Troubleshooting-continued -706880235
TM 5-4210-233-14&P-1
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - THROTTLE - Continued
2
PUMP PANEL VERNIER THROTTLE (SENSOR PTO CONTROL) DOES NOT FUNCTION
PROPERLY (Refer to Electrical Wiring Diagrams, Appendix H, Sheet 13 of 16.)
Step 1. Check that pump is engaged and green "Do not advance throttle unless light is on" light is
illuminated.
Engage pump, park brake on, shift selector in D (drive).
Step 2. Attempt to advance throttle using pump panel throttle control.
If throttle advances, control is operable.
If throttle fails to advance, go to Step 3.
Step 3. Engage hi-idle using dash HIGH IDLE switch.
If hi-idle engages, go onto Step 4.
If hi-idle fails to engage, refer to hi-idle circuit troubleshooting procedures.
Step 4. Check CRY054 contacts 4 and 7 for continuty (refer to Electrical Wiring Diagrams,
i
Appendix H, Sheet 4 of 15).
Replace CRY054 (see para 4-9.4).
Step 5. Check CRY031, contacts 1 and 7 for continuity (refer to Electrical Wiring Diagrams,
Appendix H, Sheet 4 of 15).
Replace CRY031 (see para 4-9.4).
Step 6. Check wire 1993 for continuity between CRY031 and vernier throttle "5" terminal B.
Replace wire (see para 4-9.4).
Step 7. Check wires D952 and D916 from vernier throttle connector DDEC ECM connector 1 for
continuity.
Replace wire (see para 4-9.4)
Step 8. Attempt to advance throttle using foot pedal.
If foot pedal advances throttle, replace vernier throttle control (see para 4-27).
If foot pedal does not advance throttle, replace DDEC electronic control module (ECM).
Notify Direct Support.
4-105

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