3176C Engine for the R1600G and the R1700G Load Haul Dumps Shutdown - Test Caterpillar


Shutdown - Test
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System Operation Description:

Use this procedure to troubleshoot a suspected problem with the shutdown switch. Use this procedure if the diagnostic code in Table 1 is active.

Table 1
Diagnostic Code Table    
Description     Conditions which Generate this Code     System Response    
267-2 Remote Shutdown Input erratic, intermittent, or incorrect     Both of the switch contacts for the shutdown switch are in the open state or both of the switch contacts for the shutdown switch are in the closed state.     If both of the switch contacts from the shutdown switch change to the same state and the engine is running, the engine will continue to run. The code is logged.    

Determine if the shutdown was intentional or accidental. If the shutdown was intentional, make sure that the reason for the shutdown has been corrected. Reset the control system. Resume normal operation.

The shutdown switch provides the ability to shut down the engine. The engine's Electronic Control Module (ECM) remains active. AVSpare Electronic Technician (ET) can be used to communicate with the ECM. The shutdown switch must be returned to the Run position and the engine rpm must be zero before the ECM will allow the engine to start.

To shut down the engine, lift the red cover guard and toggle the shutdown switch to the Shutdown position. The ECM reads the position of the shutdown switch. If the engine is running, the ECM disables the fuel injection.

The ECM will not allow the engine to start if the status for the shutdown switch is "Remote Shutdown". Also, the keyswitch must be cycled before the ECM will allow the engine to start.




Illustration 1g01408975

Typical schematic

Test Step 1. Inspect Electrical Connectors and Wiring

  1. Turn the keyswitch to the OFF position.

  1. Remove electrical power from the ECM.



    Illustration 2g01139425

    ECM

    (1) J1/P1 connectors

    (2) J2/P2 connectors

  1. Thoroughly inspect the ECM connector J1/P1. Thoroughly inspect the connectors for the shutdown switch. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.



    Illustration 3g01411373

    P1 ECM connector

    (P1-24) Shutdown (NC)

    (P1-25) Shutdown (NO)

  1. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.

  1. Check the allen head screw from each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.

  1. Check the harness and the wiring for abrasion and for pinch points.

Expected Result:

All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.

Results:

  • OK - The harness and wiring are OK. Proceed to Test Step 2.

  • Not OK - There is a problem in the connectors and/or wiring.

    Repair: 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 the connectors are completely coupled.Verify that the repair eliminates the problem.

    STOP

Test Step 2. Check the Status of the Shutdown Switch on Cat ET

  1. Connect Cat ET to the service tool connector.

  1. Restore electrical power to the ECM.

  1. Turn the keyswitch to the ON position.

  1. Observe the status of the shutdown switch on Cat ET.

  1. Operate the shutdown switch. Observe the status of the shutdown switch on Cat ET.

Expected Result:

The status of the shutdown switch on Cat ET is "Remote Shutdown" when the shutdown switch is in the Shutdown position.

Results:

  • OK - The status of the shutdown switch on Cat ET is correct.

    Repair: The shutdown switch is operating normally. There may be an intermittent problem. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".

    STOP

  • Not OK - The status of the shutdown switch on Cat ET is incorrect. The shutdown switch is not operating normally. Proceed to Test Step 3.

Test Step 3. Create a Short at the Shutdown Switch

  1. Turn the keyswitch to the OFF position.

  1. Disconnect the wiring for the shutdown switch.

  1. Create a short circuit between the wire F716-WH and engine ground.

  1. Turn the keyswitch to the ON position.

  1. Observe the status of the shutdown switch on Cat ET.

  1. Remove the wire short. Create a short circuit between the wire F715-BU and engine ground.

  1. Observe the status of the shutdown switch on Cat ET.

  1. Turn the keyswitch to the OFF position.

  1. Remove the wire short. Return all wires to the original configuration.

Expected Result:

The status of the shutdown switch on Cat ET is not "Remote Shutdown" when a short circuit is created between wire F716-WH and engine ground. The status of the shutdown switch on Cat ET is "Remote Shutdown" when a short circuit is created between wire F715-BU and engine ground.

Results:

  • OK - The status of the shutdown switch on Cat ET is correct.

    Repair: The problem is not with the harness or the ECM. Temporarily connect a new shutdown switch. Verify that the new shutdown switch solves the problem before you permanently install the new shutdown switch.

    STOP

  • Not OK - The status of the shutdown switch on Cat ET is incorrect. There is a problem in the harness and/or the ECM. Proceed to Test Step 4.

Test Step 4. Create a Short at the ECM

  1. Fabricate jumper wires that can be used to replace the wires in the ECM connector for the shutdown switch. Crimp a connector socket to one end of the jumper wire.

  1. Disconnect the ECM connector J1/P1.

  1. Remove the wires from P1-24 and P1-25.

  1. Install the jumper wires into the terminal locations for the shutdown switch at the ECM connector.

  1. Create a short circuit at the P1 ECM connector between the jumper wire in P1-24 and engine ground.

  1. Turn the keyswitch to the ON position.

  1. Observe the status of the shutdown switch on Cat ET.

  1. Remove the short circuit. Create a short circuit at the P1 ECM connector between the jumper wire in P1-25 and engine ground.

  1. Observe the status of the shutdown switch on Cat ET.

  1. Turn the keyswitch to the OFF position.

  1. Return all wires to the original configuration.

Expected Result:

The status of the shutdown switch on Cat ET is not "Remote Shutdown" when a short circuit is created between P1-24 and engine ground. The status of the shutdown switch on Cat ET is "Remote Shutdown" when a short circuit is created between P1-25 and engine ground.

Results:

  • OK - The status of the shutdown switch on Cat ET is correct.

    Repair: The problem is in the harness between the ECM connector and the shutdown switch. Repair the harness or the connector.

    STOP

  • Not OK - The status of the shutdown switch on Cat ET is incorrect.

    Repair: Replace the ECM. Refer to Troubleshooting, "ECM - Replace".

    STOP

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