TM-5-2350-262-20-1

ARMORED COMBAT EARTHMOVER (ACE), M9

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL; VOLUME 1 OF 3

TM-5-2350-262-20-1 - Page 336 of 776

TM 5-2350-262-20-1

Step 6.

With engine running and suspension in UNSPRUNG, check for continuity between pins

(12) and (13); and between pins (11) and (14).

If an open circuit

is indicated between any of the pins in test, refer to vehicle

electrical system wiring diagram (p FP-3) and control wiring harness (p FP-7), and

troubleshoot circuits 509, 509B, and 509C.

If problem persists, replace unsprung pressure switch (p 4-139).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

75.

WARNING BUZZER AND EMERGENCY FLASHER DO NOT OPERATE WHEN SUSPENSION

IS IN UNSPRUNG AND TRANSMISSION IS IN REVERSE - CONTINUED

Step 5.

Remove plug (9) from unsprung pressure switch (10).

With engine running and

suspension in UNSPRUNG, check for voltage at pins (11) and (12).

If minimum 24 VDC is present at pins (11) and (12), go to step 6.

If no voltage is present at pins (11) and (12), refer to vehicle electrical system wiring

diagram (p FP-3) and control wiring harness (p FP-7), and troubleshoot circuit 509.

If problem persists, troubleshoot warning buzzer, MALFUNCTION 77 (p 3-329).

11

13

9

14

12

Change 4

3-325 (325.1 through 325.8 deleted)