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 TM 9-2320-364-20-1
Allow engine to cool before performing trouble-
shooting maintenance. If necessary use
insulated pads and gloves. Hot engine
components will burn and cause injury to
personnel.
Use jumperwire only between terminals
indicated. Failure to comply may result in
damage to DDEC components or wiring.
DDEC ECM connector terminals are easily
damaged. Use care when connecting and
disconnecting terminals.
DDR TEST
(1) Disconnect TPS connector.
(2) Turn ON ENGINE switch
(TM 9-2320-364-10).
(3) Select MODE 01 (ACTIVE CODES)
on DDR.
(4) Are there any codes displayed on
DDR.
(a) If code 21 and any other codes
are present, turn OFF ENGINE
switch and go to Step 6 of this
Fault.
(b) If any codes other than 21 are
present on DDR, turn OFF
ENGINE switch and go to Step 3
of this Fault.
RESISTANCE TEST
(1) Place jumperwire between terminals C
and B at TPS harness connector MC6.
(2) Loosen screw and disconnect vehicle
harness connector MC18 at DDEC
ECM.
(3) Read resistance between wires 952
and 417 at vehicle harness connector
MC18, terminals D2 and C3.
(a) If there are 5 ohms or more
present, remove jumperwire and
repair wires 952 and/or 417
(see schematic Fig 2-1) or notify
DS Maintenance.
(b) If there are 5 ohms or less,
go to Step 4 of this Fault.
(4) Connect vehicle harness connector
MC18 to DDEC ECM and tighten
screw.
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