Section
4
TROUBLESHOOTING
CHARTS
D. CHART
19 l POWER
CONTROL
INPUT
INOPERATIVE
(Contd.)
TM 9-2320-363-20-1
C194
Check
for Open
l Turn ignition
off.
l Disconnect
the vehicle harness
connector at the ECM.
. Read resistance
between socket
H2 of the vehicle harness
connector
and the device being
used to trigger the engine
protection system.
l Close switch (relay or triggering
device).
C19-5
Check
for Ground
l Read voltage on the 6-way power
harness connector,
socket A or
B (red lead) to C (black lead).
l ALSO read voltage on 6-way power
harness connector,
socket E or F
(red lead) to socket D (black
lead).
C19-30
Verify
Repairs
l (Note: if the power Control input is
being used for engine protection,
you will not be able to confirm
repair unless the engine protection
function can be triggered).
l Start and run engine.
l select Mode
29 MISC SWITCHES
on DDR for display.
l Recreate conditions under which
the Power Control input should
be grounded,
and observe
DDR display labelled POWER
CTL SW.
Less than
5 ohms.
Greater than
5 ohms or open
Less then 11.5
volts on either reading.
Greater than or
equal to 11.5 volts
on both readings
DDR display
reads "OFF.
DDR display
reads ON.
WHAT TO DO NEXT
A fault may exist in the device
used to trigger engine shutdown
(faulty switch or relay, etc.). If
no fault can be found with the
triggering
device, go to C19-3.
The
Power Control line (ckt#524)
is open. Repair open, page 3-2,
and go to Cl 9-3. If an open is
not found, go to Cl 9-5.
Ground wire(s) (ckt#150)
has
open. Contact Direct Support.
Then go to Cl 9-30.
Go to C19-3.
All system diagnostics
are
complete.
Please review this
section from the first step to find
the error.
Repairs are complete.
3-199