Test Step 1. Check for Diagnostic Codes -807640300

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.