Section
4
TM 9-2320-363-20-1
TROUBLESHOOTING
CHARTS
E. CODE 14-
OIL OR COOLANT
TEMPERATURE
SENSOR
(OTS OR CTS) SIGNAL
VOLTAGE
HIGH
NOTE — This chart is only to be used if:
1) All bastemechanical 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.
14-1
Sensor
Check
l Turn ignition off.
l Disconnect OTS or CTS and install
a jumper between the OTS or CTS
connector
sockets A and B.
l Turn ignition on.
l Read active codes.
14-2
Check
for Short to
+5 Volt Line
l Turn ignition off.
l Remove jumper wire.
l Disconnect the engine harness
connector at the ECM.
l Read resistance between sockets
R2 and WI on the engine harness
connector.
14-3
Check
OTS or CTS
Connectors
l Inspect terminals at the OTS or
CTS connectors
(both the sensor
and harness side) for damage:
bent, corroded,
and unseated
pins or sockets.
14-4
Open line Check
l Turn inition off.
l Disconnect the engine harness
connector at the ECM.
• Read resistance between sockets
R2 and Y2 on the engine harness
connector.
RESULT
WHAT TO DO NEXT
Code 15 (or any codes
GO to 14-2.
except Code 14).
Anything except
Go to 14-4.
Code 15.
Less than or equal to
10,000 ohms.
Signal line (ckt#120)
is shorted
to the engine +5 Volt line (ckt
#41 6), and/or (ckt#120)
signal
line is shorted to ground and/or
sensor return (ckt#452).
Contact Direct Support.
Greater than 10,000
Go to 14-3.
ohms or open.
Terminals and
Replace OTS, page 4-323 or CTS,
connectors
are okay.
page 4-236. Then go to 14-30.
Problem found.
Repair terminals/connectors,
page 3-2. Then go to 14-30.
Less than or
equal to 5 ohms.
Greater than
Signal line (ckt#120)
or return
5 ohms or open.
line (ckt #452) is open. Contact
Direct Support.
3-209
