Test Step 1. Check for Diagnostic Codes -807640297

119

TM 9-2320-312-24-2

Troubleshooting Section

If "Engine Monitoring" is programmed to "DERATE"

Results:

or "SHUTDOWN", the check engine lamp and the

OK Proceed to Test Step 3.

warning lamp will flash.

Not OK

This diagnostic code requires a customer password

in order to be cleared.

Repair: Repair the problem.

Engine Response If "Engine Monitoring" is

programmed to "WARNING" there is no effect on

Ensure that the repair eliminates the problem.

engine power.

STOP.

If "Engine Monitoring" is programmed to "DERATE"

Test Step 3. Inspect Electrical Connectors

or "SHUTDOWN", the ECM begins limiting vehicle

And Wiring.

speed and power.

Troubleshooting:

A. Thoroughly inspect the following connectors:

J2/P2 ECM engine harness connector

This diagnostic code indicates an excessive coolant

temperature. This diagnostic code does not indicate

J1/P1 ECM vehicle harness connector

a problem with the ECM or a problem with the

coolant temperature sensor.

connector terminals for the sensor

Test Step 1. Check for Diagnostic Codes.

Refer to Troubleshooting, "Electrical Connectors

A. Connect Caterpillar Electronic Technician (ET) to

- Inspect" for details.

the cab data link connector.

B. Perform a 45 N (10 lb) pull test on each of the

B. Turn the keyswitch to the ON position. The

wires in the ECM connector that are associated

engine should be OFF.

with the appropriate diagnostic code.

C. Check for any active diagnostic codes or logged

C. Check the ECM connector (allen head screw) for

diagnostic codes.

the proper torque of 6.0 Nm (55 lb in).

Expected Result:

D. Check the harness and wiring for abrasion and

pinch points from the appropriate sensor back

There should be no diagnostic codes that are

to the ECM.

present.

Expected Result:

Results:

All connectors, pins and sockets should be

OK Proceed to Test Step 2.

completely coupled and/or inserted and the harness

and wiring should be free of corrosion, abrasion

Not OK

or pinch points.

Repair: Repair the diagnostic codes that are

Choose the OK option in order to select the sensor

present. Refer to the appropriate topic in the

that requires troubleshooting or select the NOT OK

"Troubleshooting With a Diagnostic Code" section

option if the wiring is causing the problem.

of this manual.

Results:

Ensure that the repair eliminates the problem.

OK Proceed to Test Step 4.

STOP.

Not OK Repair the connectors or wiring and/or

Test Step 2. Perform a Check of the

replace the connectors or wiring. Ensure that all

Cooling System.

of the seals are properly in place and ensure that

the connectors are completely coupled. Verify

that the repair eliminates the problem. STOP.

A. Perform a check of the cooling system. Ensure

that the coolant is at the proper level.

Test Step 4. Check the Sensor in the

Engine.

Expected Result:

A. Ensure that the temperature of the engine is cool

There are no problems with the cooling system.

before starting this procedure.