FILM GP 4645615 - Caterpillar

Illustration 1 g01186062
This diagnostic code is associated with an internal problem with one of the AccuGrade - Grade Control System devices. An unknown device is detected.Test Step 1. CYCLE POWER TO THE SYSTEM
Turn the keyswitch for the machine to the "OFF" position.
Turn the keyswitch for the machine to the "ON" position.Expected Result:The diagnostic code becomes inactive.Results:
YES - The diagnostic code becomes inactive. Return the machine to normal operation.STOP
NO - The diagnostic code is still active. Proceed to Test Step 2.Test Step 2. CHECK THE HARNESS FOR AN OPEN.
Turn the key start switch and the disconnect switch for the machine to the OFF position.
Disconnect the harness from the right "knuckle" connector.
Measure the resistance between pin "B" and pin "F".Expected Result:The resistance is less than 5.0 ohms.Results:
OK - The resistance is less than 5.0 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5000 ohms. The resistance measurement is not correct. There is an open circuit in the machine harness.Repair: The open is in wire T745-YL of the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE HARNESS FOR A SHORT.
Turn the key start switch and the disconnect switch for the machine to the OFF position.
Disconnect the harness from the left knuckle connector.
Measure the resistance between pin "B" and pin "F".Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 4.
NOT OK - The resistance is less than 5000 ohms. The resistance measurement is not correct. There is an short circuit in the machine harness.Repair: The short is in wire T748-PK of the machine harness. Repair the machine harness or replace the machine harness.STOPTest Step 4. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the contacts of the harness connectors and clean the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Check the status of the "CB 23".Expected Result:The "CB 23" diagnostic code is active.Results:
YES - The "CB 23" diagnostic code is active. The diagnostic code has not been corrected. Repair: Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, contact your Technical Communicator for a possible consultation with Caterpillar.STOP
NO - The "CB 23" diagnostic code is not active. The diagnostic code does not exist at this time.Repair: The initial diagnostic code was probably caused by a poor electrical connection at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.STOP