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COUPLING 2H9387 - Caterpillar



2H9387 COUPLING Caterpillar parts COUPLING
Rating:
46
Alternative (cross code) number:
CA2H9387
2H-9387
2H9387
Caterpillar 2H9387 COUPLING
Weight: 0.02 pounds 0 kg.

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Illustration 1 g01267205
Parking Brake Switch CircuitThe parking brake switch has two inputs to the ECM. The two inputs are normally open and normally closed. During normal operation, one of the inputs is open. The other input is grounded. When a circuit is measured with a voltmeter, an open circuit will measure approximately 13 DCV to ground and a closed circuit will measure approximately 0 DCV to ground. An FMI 03 diagnostic code is recorded when the status of both the inputs are open.The possible causes of this diagnostic code are listed below:
The return circuit (wire 200-BK) is open.
Switch contact "1" signal circuit (wire A314-OR) is permantly open.
Switch contact "3" signal circuit (wire F780-PK) is permantly open.
The parking brake switch has failed.
The ECM has failed. This is unlikely. System Response:The diagnostic indicator will flash. The park brake will be engaged.Note: Ensure that the diagnostic code CID 70 - FMI 03 is active before performing this procedure.Test Step 1. CHECK THE GROUND CIRCUIT AT THE SWITCH
Disconnect the negative battery cable and turn the key start switch to the OFF position.
Measure the resistance between switch contact "2" (wire 200-BK) and frame ground.Expected Result:The resistance should be less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. Proceed to Test Step 2.
NOT OK - The resistance is greater than 5 ohms. Proceed to Test Step 4.Test Step 2. CHECK THE SWITCH IN THE PRESSED POSITION
Place the switch in the PRESSED position.
Measure the resistance between contact "2" and contact "1" of the switch.
Measure the resistance between contact "2" and contact "3" of the switch.Expected Result:The resistance should be less than 5 ohms between contact "2" and contact "3" and the resistance should be greater than 5000 ohms between contact "2" and contact "1".Results:
OK - The resistance is less than 5 ohms between contact "2" and contact "3" and the resistance is greater than 5000 ohms between contact "2" and contact "1". Proceed to Test Step 3.
NOT OK - The resistance is not within an acceptable range. The switch has failed.Repair: Replace the parking brake switch. Verify that the new switch corrects the diagnostic code.STOPTest Step 3. CHECK THE SWITCH IN THE RELEASED POSITION
Place the switch in the RELEASED position.
Measure the resistance between contact "2" and contact "1" of the switch.
Measure the resistance between contact "2" and contact "3" of the switch.Expected Result:The resistance should be greater than 5000 ohms between contact "2" and contact "3" and the resistance should be less than 5 ohms between contact "2" and contact "1".Results:
OK - The resistance is greater than 5000 ohms between contact "2" and contact "3" and the resistance is less than 5 ohms between contact "2" and contact "1". Proceed to Test Step 4.
NOT OK - The resistance is not within an acceptable range. The switch has failed.Repair: Replace the parking brake switch. Verify that the new switch corrects the diagnostic code.STOPTest Step 4. CHECK THE SIGNAL CIRCUITS FOR AN OPEN
Disconnect the machine harness connectors from the ECM.
Measure the resistance between


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