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Table 4-2. Unit Troubleshooting-continued -706880199
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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 -706880201
TM 5-4210-233-14&P-1
Table 4-2.
Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM-IGNITION CIRCUITS-Continued
4
ENGINE/TRANSMISSION BUZZER REMAINS ON
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 3 of 16.)
Step 1. Check low oil PSI switch.
Replace switch (see para 4-138).
Step 2. Check low air PSI switch.
Replace switch (see para 4-9.4).
Step 3. Check low rear air PSI switch.
Replace switch (see para 4-9.4).
Step 4. Check high transmission oil pressure switch.
Replace switch (see para 4-9.4).
Step 5. Check high/low voltage alarm.
Replace alarm. (see para 4-9.4).
Step 6. Check wiring for continuity.
Replace wire (see para 4-9.4).
5
ENGINE/TRANSMISSION ALARM BUZZER DOES NOT SOUND DURING IGNITION TEST
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 6 of 16.)
Step 1. Check for +12V on ignition accessory buss.
Refer to "+12 volts not present at battery accessory buss" troubleshooting procedure.
Step 2. Check for +12V at circuit breaker #4 on ignition accessory buss.
Replace breaker (see para 4-99).
Step 3. Place a jumper from wire 1046 to a good ground.
If buzzer sounds, go on to step 4.
If buzzer does not sound, replace alarm buzzer unit (see para 4-96).
4-71

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