• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

D6N FC 036-0168.04

B

biggerhammer

Well-Known Member
Joined
Oct 23, 2012
Messages
48
Location
Canada
Arrangement 246-8488
SN- DJY00552
Comes on when releasing the park brake-operates normally
Was reported unit will derate (idle down no power), restart and all is fine, not sure if its related. I've advised the operator to check for other codes next time it happens
Any input on this would be appreciated
Thx
 
M

Mark250

Senior Member
Joined
Aug 30, 2015
Messages
1,243
Location
victoria,Australia
Occupation
heavy equipment technician
the fault is for the park brake circuit
The following troubleshooting procedure applies to all the machines referenced in the above circuit schematics. See the above circuit schematic and the machine Electrical Schematic that applies to your machine.
This diagnostic code is associated with the parking brake switch. The parking brake switch has two inputs to the ECM. The inputs are Normally Open and Normally Closed. During normal operation, one of the inputs is open and the other input is grounded. A failure is detected when both inputs are in the same state at the same time. The ECM monitors the two switch to ground type inputs from the switch to determine the status of the switch. The ECM also monitors the switch energize circuit at the ON/OFF output.
Note: On the D6N (S/N: DJA; DJY) and the 561N, the parking brake dump solenoid will be energized when the switch is in the ON (brake engaged) position. Under certain machine conditions, the solenoid can be energized by the power train ECM using the ON/OFF output circuit at contact J2-3.
The following occurs when the ECM detects that the parking brake switch is in the ON (brake engaged) position:
    • The ECM expects to detect the solenoid energize voltage (system voltage)
    • The energize voltage is directed through the switch contacts.
Note: If the ECM does not detect system voltage when the parking brake switch is on, a CID 0618 FMI 02 will be activated.
Some other conditions that can cause this diagnostic code to be activated are:
    • Fuse open or circuit breaker tripped
    • Switch failure
    • Open in the switch energize circuit
    • ECM has failed
Note: Before performing this procedure, check to see if the ECM has activated any CID 0681 (parking brake solenoid) diagnostic codes. Some of the same conditions that can cause the ECM to activate a CID 0681 code can also activate a CID 0618 code. Correct the problem and clear the active CID 0681 diagnostic codes. Then verify that the CID 0618 diagnostic code is still active.
Note: Before performing this procedure, verify that there is power to parking brake switch. An open fuse or tripped circuit breaker would result in this diagnostic code and other diagnostic codes being activated.
Test Step 1. CHECK THE SWITCH OPERATION
    • Turn off the disconnect switch and the key switch.
    • Disconnect the harness connector from the parking brake switch connector.
    • At the switch connector, measure the resistance between the energize contact 3 and the supply contact 11 with the switch off and on.
    • At the switch connector, measure the resistance between the energize contact 4 and the supply contact 11 with the switch off and on.
Expected Result:
D6N (S/N: DJA; DJY), D5M, D6M, D6R, D6RII, D7R, D7RII, D8RII, and 572R at switch contact 4
With switch turned on: Resistance between the switch contact 4 and switch contact 11 is less than 5 ohms.
With the switch off: Resistance between the switch contact 4 and switch contact 11 is greater than 5000 ohms.
D6N (S/N: DJA; DJY), D5M, D6M, D6R, D6RII, D7R, D7RII, D8RII, and 572R at switch contact 3
With switch turned on: Resistance between the switch contact 3 and switch contact 11 is greater than 5000 ohms.
With the switch off: Resistance between the switch contact 3 and switch contact 11 is less than 5 ohms.
D5N, D6N, D10R, D11R, and 561N at switch contact 4
With switch turned on: Resistance between the switch contact 4 and switch contact 11 is less than 5.0 ohms.
With the switch off: Resistance between the switch contact 4 and switch contact 11 is greater than 5000 ohms.
D5N, D6N, D10R, D11R, and 561N at switch contact 3
With switch turned on: Resistance between the switch contact 3 and switch contact 11 is greater than 5000 ohms.
With the switch off: Resistance between the switch contact 3 and switch contact 11 is less than 5.0 ohms.
Results:
    • OK - The switch contact states are correct when the switch is in the ON position and when the switch is in the OFF position. The switch is operating correctly. Proceed to Test Step 4.
    • NOT OK - The switch contact states are not correct when the switch is in both positions.
      Repair: The parking brake switch has failed.
        • Replace the switch.
        • Verify that the new switch operation is correct before operating the machine.
      STOP
Test Step 2. CHECK PARKING BRAKE SYSTEM SOLENOIDS
Depending on the machine model, there may be additional solenoids in the parking brake system. See the parking brake circuit schematic above or the machine Electrical Schematic for the machine being worked on to determine if solenoids are involved.
A solenoid problem should create a CID 0681 diagnostic code.
    • Check the active diagnostic codes for CID 0681.
Expected Result:
CID 0681 is active.
Results:
    • YES - CID 0681 is active.
      Repair: Proceed to the story for that code and follow the procedure there.
      STOP
    • NO - CID 0681 is not active. Proceed to Test Step 3.
Test Step 3. CHECK PARKING BRAKE SYSTEM RESISTORS
Depending on the machine model, there may be resistors in the parking brake system. See the parking brake circuit schematic above or the machine Electrical Schematic for the machine being worked on to determine if resistors are involved.
    • Isolate the resistor.
    • Measure the resistance between pin A and pin B.
Expected Result:
The resistance is approximately 120 ohms.
Results:
    • YES - The resistance is approximately 120 ohms. The resistance is correct. Reinstall the termination resistor plug. Proceed to Test Step 4.
    • NO - The resistance is not approximately 120 ohms.
      Repair: Replace the resistor.
      Verify that the problem has been corrected.
      STOP
Test Step 4. CHECK THE ENERGIZE CIRCUIT BETWEEN THE SWITCH AND THE ECM FOR AN OPEN
Note: The normally closed switch contact in all the machines is switch contact 3. The difference in machine model wiring is which wire is connected to switch contacts 3 and 4, and which ECM pin is used for battery+.
The disconnect switch and the key switch remain off. The parking brake switch remains disconnected from the harness.
    • At the machine harness connector for the switch, connect a jumper wire between the normally closed (N/C) contact 3 and the energize contact 11 (wire G939-PK(Pink)).
    • Disconnect the J1 and J2 harness connectors from the Power Train ECM.
    • At the ECM harness connectors, measure the resistance between the N/C contact and energize circuit contact J2-3 (wire 975-WH(White)).
    • While observing the resistance on a multimeter, wiggle the ECM hand switch harness connectors. Gently pull on the wires and move the wires around. Do not disconnect the jumper wire.
Expected Result:
The resistance is less than 5 ohms at all times during the manipulation of the harness and connectors.
Results:
    • OK - The resistance measurement is less than 5 ohms. The switch input circuit between the switch and the ECM are not open in the harness. Proceed to Test Step 5.
    • NOT OK - The resistance is greater than 5 ohms. The switch input circuit between the switch and the ECM is open or has a poor connection in the harness.
      Repair: A resistance that is greater than 5000 ohms could indicate that a wire is broken or is not connected. A resistance greater than 5 ohms, but less than 5000 ohms, indicates one of the circuit connection points is not open, but is poor.
      There is an open or a poor connection in solenoid energize (wire 975-WH(White)) between the switch and the ECM.
      See the machine Electrical Schematic. Verify that all connection points for the circuit between the ECM and the switch are clean, secure, and in good condition.
      Repair or replace the harness.
      STOP
 
M

Mark250

Senior Member
Joined
Aug 30, 2015
Messages
1,243
Location
victoria,Australia
Occupation
heavy equipment technician
Do you need an electrical schematic?

Test Step 5. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Note: A solenoid energize circuit open would not cause this diagnostic code, however, check for this condition. Disconnect the solenoid, place a jumper wire between the harness connector solenoid energize and solenoid return contacts at the ECM. See the circuit schematic for your machine at the beginning of this procedure for contact identification. Measure the resistance between the energize circuit contact and the return circuit contact. If a problem is found, correct the problem and then perform the following:
    • Inspect and clean the harness connector contacts.
    • Reconnect all harness connectors.
    • Turn on the key switch.
    • Enter service mode of the Caterpillar® Monitoring System.
    • Clear all inactive diagnostic codes.
    • Operate the machine.
    • Determine if CID 0618 FMI 02 is active.
Expected Result:
CID 0618 FMI 02 is still active.
Results:
    • YES - CID 0618 FMI 02 is active.
      Repair: Use the Caterpillar® Electronic Technician (Cat® ET) service tool to perform a wiggle test on the wiring harness. The wiggle test can detect momentary or intermittent shorts or opens in the wiring harness.
      Verify that all possible causes of the diagnostic code have been investigated. Exit this procedure and perform this procedure again.
      If the problem remains, contact your Cat dealership for possible consultation with Caterpillar. If the cause of the diagnostic code is not found, replace the Power Train ECM. See Troubleshooting, "Electronic Control Module (ECM) - Replace".
      STOP
    • NO - CID 0618 FMI 02 is not active.
      Repair: The initial problem was probably caused by a poor connection or short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
      STOP
 
You must log in or register to reply here.
Top