TM-5-4210-249-13-P-2

TACTICAL FIRE FIGHTING TRUCK (TFF) MODEL M1142

TECHNICAL MANUAL; OPERATOR’S AND FIELD LEVEL MAINTENANCE MANUAL WITH REPAIR PARTS AND SPECIAL TOOLS LIST (INCLUDING DEPOT REPAIR PARTS AND SPECIAL TOOLS); PART 2 OF 4

TM-5-4210-249-13-P-2 - Page 614 of 1452

TM 5-4210-249-13&P-2

0171-12

DRAFT

0171

TFFT04519

NOTE

Step 24 will determine if relay or wire harness is faulty.

Base HEMTT chassis wire

harness has been modified, at harness connector MC45 at rear of vehicle wire 1840 and

1516 have been butt spliced together.

Step 24.

Turn vehicle ENGINE switch to OFF position (TM 9-2320-347-10).

Turn battery

disconnect switch to OFF position (WP 0007). Remove HEMMIT relay R10

(TM 9-2320-325-14&P).

Turn battery disconnect switch to ON position (WP 0007).

Start vehicle ENGINE (TM 9-2320-347-10).

While an assistant puts and holds HIGH

IDLE switch to ON position (WP 0004), with a test lead set, check for 22 to 28 VDC from

wire 1516 (black) in HEMTT relay 86 terminal to a known good ground.

a.

If 22 to 28 VDC are present, replace relay R10 (TM 9-2320-325-14&P).

b.

If 22 to 28 VDC are not present, troubleshoot Engine High Idle Does

Not Operate (TM 9-2320-325-14&P).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION