SPRING-GOVERNOR 1W4793 - Caterpillar

Illustration 4 g01241517
View of the nine pin diagnostic connector from the wire side
(A) Switched battery +
(B) Battery ground (GND)
(D) Data link +
(E) Data link -
If the communications adapter is connected to the diagnostic connector on the engine, ensure that pin "A" and pin "B" are wired on the connector. Expected Result:The pins are wired.Results:
OK - The harness is fully wired. Proceed to Test Step 4.
Not OK - The data link connector power connections are not wired.Repair: Fabricate a jumper wire in order to connect pin "A" of the diagnostic connector to battery+ and pin "B" to the battery-.Proceed to Test Step 2.Test Step 4. Check the Battery Voltage at the Diagnostic Connector
Turn the keyswitch to the ON position.
Use a multimeter in order to measure the voltage from pin A (battery+) and pin B (ground) of the diagnostic connector. Expected Result:The voltage is between 22.0 VDC and 27.0 VDC.Results:
OK - The diagnostic connector is receiving the correct voltage. Proceed to Test Step 5.
Not OK - The diagnostic connector is not receiving the correct voltage.Repair: Refer to Troubleshooting, "Engine Wiring Information".Proceed to Test Step 2.Test Step 5. Check the Data Link Connections
Turn the keyswitch to the OFF position.
Disconnect the communications adapter from the diagnostic connector.
If the diagnostic connector is installed on the application, disconnect connector P1 from the ECM. Check the resistance between P1:23 and pin "D" on the diagnostic connector. If the diagnostic connector is installed on the engine, disconnect P2 from the ECM. Check the resistance between P2:21 and pin "D" on the diagnostic connector.
If the diagnostic connector is installed on the application, check the resistance between P1:24 and pin "E" on the diagnostic connector. If the diagnostic connector is installed on the engine, check the resistance between P2:20 and pin "E" on the diagnostic connector. Expected Result:The resistance that is measured is less than ten Ohms.Results:
OK - The resistance is less than ten Ohms. Proceed to Test Step 6.
Not OK - The resistance is greater than ten Ohms.Repair: Perform the following repair:Repair the connectors and/or the harness, or replace the connectors and/or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are coupled correctly.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 6. Change the Electronic Service Tool Components
If another electronic engine is available, connect the electronic service tool to the other engine. Ensure that the same cables are used.
Turn the keyswitch to the ON position. Determine if the electronic service tool operates correctly on the other engine.
If another engine is not available, obtain a replacement communications adapter and a replacement set of cables. Ensure that the set of cables for the electronic service tool is a complete set.
Install the replacement communications adapter and the set of cables for the electronic service tool and connect to the diagnostic connector.
Turn the keyswitch to the ON position.
If changing the communications adapter or the cables allows the electronic service