Section
4
TM 9-2320-363-20-1
TROUBLESHOOTING
CHARTS
E. CODE 15-
OIL OR COOLANT
TEMPERATURE
SENSOR
(OTS OR CTS) SIGNAL
VOLTAGE
LOW
NOTE — This chart ISonly to be used if:
1) All basic mechanical
checks and physical inspections
have been performed
with no problem found, and
2) Diagnosis of DDEC-II was started at step Start-1 (page 3-121) and you have now been referred here.
15-1
Multiple
Code
Check
l Were there any other active codes
besides Code 15?
15-2
Sensor
Check
l Turn ignition
off.
.
Disconnect
OTS or
CTS
connector.
l Start engine and run until
“Check
Engine"
light
comes
on
or after
8 minutes.
l Read active codes
with
engine
still
running.
15-3
Check
OTS or CTS
Connectors
. Inspect
terminals
at the
OTS
or
CTS connectors
(both the sensor
and harness side) for damage;
bent. corroded,
and unseated
pins or sockets.
15-4
Check
for Short
l Turn ignition
off.
. Disconnect engine harness
connector at the ECM.
l Read resistance
between
sockets
R2 and
Y2 on the
engine
harness
connector.
l Also read resistance
between
socket
B and
a good
ground.
RESULT
WHAT TO DO NEXT
No other codes.
Go to 15-2.
Yes, any or all of the
Go to ENG5V-1 (page 3-333).
following codes:
14, 23, 33.
Yes - but none of the
Go to 15-2.
above.
Any codes
Go
to 15-3.
except Code 15.
Code 15 (and
Go
to 15-4.
any other codes).
Terminals and
Replace OTS, page 4-323, or CTS,
connectors
are okay.
page 4-238. Then go to 15-30.
Problem found.
Repair terminals/connectors,
page 3-2. Then go to 15-30.
Less than or
Signal line (ckt #120) is shorted
equal to 10,000 ohms
to the return line (ckt#452)
or
on either reading.
battery ground. Repair short,
page 3-2. Then go to 15-30.
Greater than
Go to 15-5.
10,000 ohms or open
on both readings.
3-213
