KENR9126 129
Troubleshooting Section
Repair: Refer to the diagnostic functional test
Troubleshooti
ng, “Digital Sensor Supply Circuit -
Test”.
STOP.
Test Step 3. Ch eck the Co olant Level
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the engine and wait until the cooling system
components are cool. Loosen the cooling system
pressure cap slowly in order t o relieve the pres-
sure.
A. Stop the engine.
B. After allowing the engine to cool, check the
coolan t level.
Expected Result:
The coolant is at the proper level.
Results:
•
OK – The coolant is at the proper level. Proceed
to Test Step 4.
•
Not OK – The coolant level is low.
Repair: Add coolant.
Verify that the repair eliminates the problem.
Identify the source of the coolant leak and fixthe
problem.
STOP.
Test Step 4. Disconnect the Coolant
Level Sensor and Monitor the Status of
“Coolant Level”
A. Connect the electronic service tool to the
service tool connector. Refer to Troubleshooting,
“Electronic Service Tools”.
B. Disconnect the coolant level sensor connector.
C. Restore the electrical power to the ECM.
D. Monitor the status of “Coolant Level” on the
electronic service tool.
E. Remove the electrical power from the E CM.
Expected Result:
The status changes from “OK” to “Low” when the
sensor is disconnected.
Results:
•
OK – The status is “Low” when the sensor is
disconnected. Proceed to Test Step 5.
•
Not OK – The status is “OK” when the sensor is
disconnected. Proceed to Test Step 6.
Test Step 5. Short the Harness and
Monitor the Status of “Coolant Level”
A. Restore the
electrical power to the ECM and
monitor the status of “Coolant Level” on the
electronic service tool.
B. Install a jumper wire between terminals B and C on
the harness connector for the coolant level sensor.
C. Monitor the status of “Coolant Level” on electronic
service tool while the jumper wire is installed.
D. Remove the jumper wire.
E. Remove th
e electrical power from the ECM.
Expected Result:
The status changes from “Low” to “OK” when the
jumper wire is installed.
Results:
•
OK – The
status changes from “Low” to “OK”
when the jumper wire is installed. The ECM and
the wiring to the coolant level sensor are OK.
Repair: Perform the following procedure:
Pressurized System: Hot coolant can cause seri-
ous b
urns. To open the cooling system fi ller c ap,
stop the engine and wait until the cooling sy stem
components are cool. Loosen the cooling system
pres
sure cap slowly in order to relieve the pres-
sure.
1. Dra
in the coolant below the level of the coolant
level sensor.
2. Re
store the electrical power to the ECM and
monitor the status of “Coolant Level” on the
electronic service tool.
3. Remove the electrical power from the ECM.
I
f the status of the “Coolant Level” is “OK”,
replace the sensor. Verify that the problem is
resolved.
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