130 KENR9126
Troubleshooting Section
If the status for the coolant level is “Low”,
connect the sen
sor. Fill the cooling system.
Return the engine to service.
STOP.
•
Not OK – Shorting the harness does not affect
the status on
the electronic service tool. Proceed
to Test Step 6.
Test Step 6.
Check the Wiring for an Open
Circuit
A. Remove the electrical power from the ECM.
B. Disconnect the J1/P1/E-C1 and J2/P2/A-C1
connectors.
Note: Wiggle the harness during the following
measurements in order to reveal an intermittent
conditio
n.
C. Measure the resistance between the following
termina
ls:
•
TerminalA of the sensor harness connector (12
or 24 VDC
)
•
Terminal B of the sensor harness connector
(Retur
n)
•
P1-45 (Engine Coolant Level) to terminal C of
the sen
sor harness connector (Engine Coolant
Level)
Expec
ted Result:
Each resistance measurement is less than ten Ohms.
Results:
•
OK – E
ach resistance measurement is less than
ten Ohms. There are no opens in the wiring.
Proceed to Test Step 7.
•
Not OK – At least one resistance measurement is
greater than ten Ohms. There is an open circuit or
exc
essive resistance in the harness. There may be
a problem in a connector.
Rep
air: Repair the wire and/or the connector,
when possible . Replace parts, if necessary. Verify
that the problem is resolved.
STOP.
Te
st Step 7. Check the Wiring for a Short
C
ircuit
A. Remove the electrical power from the ECM.
Note: Wiggle the harness during the following
measurements i
n order to reveal an intermittent
condition.
B. Measure the re
sistance between the points that
are listed in Table 32. Be sure to wiggle the wires
in the harnesses as you make each resistance
measurement
.
Table 32
Resistance Measurements for the Circuit for
the Coolant Level Sensor
Connector and
Terminal
Terminal
All of the other terminals on
the P2 c onnector
All of the terminals on the P1
connecto
r
P1-45 (Engine Coolant
Level)
Engine ground
Expected Result:
Each check of the resistance indicates an open
circuit.
Results:
•
OK – Eac
h check of the resistance indicates an
open circuit. Proceed to Test Step 8.
•
Not OK –
At least one check of the resistance
does not indicate an open circuit. There is a
problem in the harness. There may be a problem
inaco
nnector.
Repair: Repair the wire and/or the connector,
when
possible. Replace parts, if necessary. Verify
that the problem is resolved.
STOP
.
Test Step 8. C reate a Short Circuit at the
ECM
A. Remove the terminal from locations P1-45 and
negative battery.
B. Install the ends of a jumper wire into locations
P1-45 and negative battery. This will create a
sh
ort circuit at the ECM connectors.
C. Restore the electrical power to the ECM and
mo
nitor the status of “Coolant Level” on the
electronic service tool.
D
.
R
emove the jumper wire. Monitor the status of
“Coolant Level” on the electronic service tool.
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