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122
TM 9-2320-312-24-2
Troubleshooting Section
Repair: Repair the problem.
If the "Engine Monitoring" is programmed to
"DERATE" or "SHUTDOWN", the vehicle speed is
Ensure that the repair eliminates the problem.
limited to a maximum of 72 km/h (45 mph) and
the power is limited. The engine will shut down if
conditions exist for a long enough period in the
STOP.
SHUTDOWN mode.
Test Step 3. Inspect Electrical Connectors
and Wiring.
Troubleshooting:
This diagnostic code indicates an excessive coolant
A. Thoroughly inspect the following connectors:
temperature. This diagnostic code does not indicate
J2/P2 ECM engine harness connector
a problem with the ECM or a problem with the
coolant temperature sensor.
J1/P1 ECM vehicle harness connector
Test Step 1. Check for Diagnostic Codes.
connector terminals for the sensor
A. Connect Caterpillar Electronic Technician (ET) to
the cab data link connector.
Refer to Troubleshooting, "Electrical Connectors
- Inspect" for details.
B. Turn the keyswitch to the ON position. The
engine should be OFF.
B. Perform a 45 N (10 lb) pull test on each of the
wires in the ECM connector that are associated
C. Check for any active diagnostic codes or logged
with the appropriate diagnostic code.
diagnostic codes.
C. Check the ECM connector (allen head screw) for
Expected Result:
the proper torque of 6.0 Nm (55 lb in).
There should be no diagnostic codes that are
D. Check the harness and wiring for abrasion and
present.
pinch points from the appropriate sensor back
to the ECM.
Results:
Expected Result:
OK Proceed to Test Step 2.
All connectors, pins and sockets should be
Not OK
completely coupled and/or inserted and the harness
and wiring should be free of corrosion, abrasion
Repair: Repair the diagnostic codes that are
or pinch points.
present. Refer to the appropriate topic in the
"Troubleshooting With a Diagnostic Code" section
Choose the OK option in order to select the sensor
of this manual.
that requires troubleshooting or select the NOT OK
option if the wiring is causing the problem.
Ensure that the repair eliminates the problem.
Results:
STOP.
OK Proceed to Test Step 4.
Test Step 2. Perform a Check of the
Cooling System.
Not OK Repair the connectors or wiring and/or
replace the connectors or wiring. Ensure that all
of the seals are properly in place and ensure that
A. Perform a check of the cooling system. Ensure
the connectors are completely coupled. Verify
that the coolant is at the proper level.
that the repair eliminates the problem. STOP.
Expected Result:
Test Step 4. Check the Sensor in the
Engine.
There are no problems with the cooling system.
A. Ensure that the temperature of the engine is cool
Results:
before starting this procedure.
OK Proceed to Test Step 3.
B. Connect ET to the cab data link connector.
Not OK
C. Turn the ignition key switch to the ON position.

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