Table 4-2. Unit Troubleshooting-continued -706880233

TM 5-4210-233-14&P-1

Table 4-2. Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ELECTRICAL SYSTEM - EMERGENCY MASTER CIRCUITS - Continued

ELECTRONIC SIREN DOES NOT SOUND - Continued

Step 3. Check for +12V on wire 1637 (terminal S5) at siren unit.

Replace broken wire (see para 4-9.4).

Step 4. Check internal fuse on siren unit.

Replace fuse (see para 4-86).

+12 VOLTS IS NOT PRESENT AT EMERGENCY MASTER BUSS

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 4 of 16.)

Step 1. Check emergency master solenoid.

Replace solenoid (see para 4-9.4).

Step 2. Check emergency master switch.

Replace switch (see para 4-94).

Step 3. Check wiring for continuity.

Replace wires (see para 4-9.4).

ELECTRICAL SYSTEM - THROTTLE

THROTTLE DOES NOT ADVANCE WITH ELECTRONIC FOOT PEDAL

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 13 of 16.)

Step 1. Check wiring from cab foot pedal to DDEC ECM for continuity.

Replace wire (see para 4-9.4).

Step 2. Check that throttle advances using vernier throttle on pump panel.

If throttle does not advance using pump panel control, replace ECM. Notify Direct Support.

If throttle advances using pump panel control, replace foot pedal sensor.

Notify Direct Support.

4-104