LATCH AS 3693699 - Caterpillar

Illustration 1 g02099446
Connections of the brake solenoid
This diagnostic code is associated with the brake solenoid. The FMI 06 diagnostic code means that the ECM has determined that there is a short to ground in the solenoid circuit. The possible causes of this diagnostic code are listed:
The energize circuit of the solenoid is shorted to ground.
The solenoid has failed.
The ECM has failed. A failure of the Transmission/Chassis ECM is unlikely. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear these diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 2742 FMI 06 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Observe the status of the diagnostic code.
Disconnect the solenoid with the active diagnostic code from the machine harness. Expected Result:When the solenoid is disconnected from the harness, the CID 2742 FMI 06 diagnostic code remains active. Results:
YES - The status of the active CID 2742 FMI 06 diagnostic code did not change when the solenoid was disconnected from the machine harness. The solenoid is not the cause of the problem. Proceed to Test Step 2.
NO - When the solenoid is disconnected from the harness, the CID 2742 FMI 06 diagnostic code remains active. A CID 2742 FMI 05 diagnostic code becomes active. The relay is the cause the problem. Repair: Verify that the solenoid has failed by substituting a known good relay that is the same part number as the suspect solenoid. Replace the faulty solenoid.STOPTest Step 2. CHECK THE ENERGIZE CIRCUIT OF THE SOLENOID FOR A SHORT TO GROUND.
The solenoid remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the "Transmission/Chassis ECM".
At the machine harness connector, measure the resistance from the signal contact J1-66 (wire 989-YL(Yellow)) to all contacts that are used in the machine harness connectors for the ECM. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The machine harness is correct. Proceed to Test Step 3.
NOT OK - Each resistance measurement is not greater than 5000 ohms. There is a short in the machine harness. The short is between J1-66 (wire 989-YL(Yellow)) and the circuit with the low resistance measurement.Repair: Repair the machine harness or replace the machine harness. STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips