VOLTAGE TEST -726280473

TM 9-2320-364-20-1

Allow engine to cool before performing troubleshooting maintenance. If necessary use insulated pads and

gloves. Hot engine components will burn and cause injury to personnel.

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical

circuits, a direct short may result. Damage to equipment, injury or death to personnel may occur.

DDEC ECM connector terminals are easily damaged. Use care when connecting and disconnecting connectors.

VOLTAGE TEST

(1) Remove DDEC ECM (Para 7-56).

(2) Disconnect FTS harness connector.

(3) Set DDEC ECM on mounting

bracket.

(4) Connect vehicle and engine

harness connectors, tighten two

screws.

(5) Connect power harness connector,

and right and left injector

connectors.

(6) Connect positive (+) multimeter lead

to FTS harness connector, terminal

(7) Connect negative (- ) multimeter

lead to FTS harness connector,

terminal B.

(8) Turn ON ENGINE switch

(TM 9-2320-364-10).

(9) Are 4.7 to 5.2 vdc present between

wires 452 and 472 at FTS harness

connector, terminals A and B?

(a) If less than 4.7 vdc are present,

turn OFF ENGINE switch, and go

to Step 5 of this Fault.

(b) If more than 5.2 vdc are present,

turn OFF ENGINE switch and go

to Step 7 of this Fault.

go to Step (10) below.

(10) Disconnect TBS harness connector

from sensor.

(11) Connect positive (+) multimeter

lead to TBS harness connector,

terminal A.

(12) Connect negative (- ) multimeter

lead TBS harness connector,

terminal C.

(13) Turn ON ENGINE switch.

(14) Are 4.7 to 5.2 vdc present between

wires 452 and 416 at TBS

connector MC6, terminals A and C.

(a) If less than 4.7 vdc are present,

perform Steps (15) through (18)

below and go to Step 5 of this

Fault.

(b) If more than 5.2 vdc are present,

perform Steps (15) through (18)

below and go to Step 7 of this

Fault.

TBS connector is OK.

(15) Turn OFF ENGINE switch.

(16) Connect TBS connector

to sensor.

(17) Connect FTS harness connector to

sensor.

(18) Install DDEC ECM (Para 7-56).

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