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PLUG AS-CONN 4647375 - Caterpillar



4647375 PLUG AS-CONN Caterpillar parts PLUG
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Alternative (cross code) number:
CA4647375
464-7375
4647375
Caterpillar 4647375 PLUG AS-CONN

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Illustration 1 g01334727
Service Test Harness Detection circuitryThis diagnostic code is associated with the detection of the Service Test Harness. The Service Test Harness is used when the cab is removed from the machine. The Service Test Harness acts as a switch with respect to the ECM and the software then knows that the cab is removed and specific diagnostics are inhibited. This allows for the service tech to perform specified tests with the cab removed. The Service Test Harness is not a regular part of the machine harness. The Service Test Harness is a service tool harness specifically for performing tests with the cab removed. The ECM expects one of the two inputs to be grounded. When the ECM detects that both of the switch inputs are grounded at the same time, the ECM will activate an FMI 04 diagnostic code for voltage below normal.Possible conditions that can cause this diagnostic code are listed:
Both of the switch inputs are shorted to a ground source.
The machine harness has failed.
The Service Test Harness has failed.
The ECM has failed. This is unlikely. Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Test Step 1. CHECK THE STATUS OF THE DIAGNOSTIC CODE.
Observe the status of the Diagnostic Code with the Service Test harness in the circuit.
Remove the Service Test harness and reconnect the original 40-pin machine harness connectors.
Observe the status of the Diagnostic Code.Expected Result:The Diagnostic Code is active only when the Service Test harness is in the circuit.Results:
YES - The Diagnostic Code FMI 04 is active only when the Service Test harness is in the circuit.Repair: There is short in the Service Test Harness. Repair the Service Test Harness or replace the Service Test Harness. STOP
NO - The Diagnostic Code FMI 04 is active when the Service Test harness is NOT used in the circuit. Proceed to Test Step 2.Test Step 2. CHECK FOR A SHORT BETWEEN THE GROUNDING CIRCUIT WIRESNote: The Service Test Harness is NOT part of the circuit during this Test Step.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the machine harness J1 connector from the Machine ECM.
Disconnect the 40 pin connector.
At the end of the machine Harness to the ECM (PL-C18), measure the resistance between contact 39 (wire A283-BKand contact 40 (wire A284-BK.Expected Result:The resistance measurement is greater


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