BUCKET AS-GENERAL PURPOSE 4919821 - Caterpillar

Introduction
This Special Instruction, REHS1613 provides information in order to test the voltage of the automatic burner control on the asphalt screeds. The ECM on the screed determines the amount of time that the glow plugs will be activated. The ECM activates the glow plugs. The battery voltage that is sent to the ECM will determine the activation period for the glow plugs. If the input voltage is 27 volts or more, the glow plugs will activate for 12 to 25 seconds. If the input voltage is 24 volts or less, the glow plugs will be activated for 25 seconds or more.Testing Procedure
Illustration 1 g00985734
(1) 40-pin connector
Use a communication adapter and connect the laptop computer to the communication port on the automatic burner control that is located on the underside of the walkway. Use Winflash in order to determine the software version that is currently loaded on the ECM.
If version 2.02 is not loaded on the computer, acquire a copy of the 187-2703 Burner Electronic Software from the Caterpillar Service Information System (SIS). Download the software from the laptop computer to the ECM on the screed. After you download the software, turn the master switch for the battery to the OFF position and to the ON position. Use the laptop computer in order to confirm the proper installation of the software.
Start the engine and use a multimeter in order to check the voltage of the battery at HIGH idle and at LOW idle. The voltage should be greater than 27 volts. If the voltage is less than 27 volts, test the alternator and the battery for proper operation.
Locate the 40-pin connector (1) that is attached to the ECM of the automatic burner control. The ECM for the automatic burner control is located under the walkway of the screed.
Illustration 2 g00985735
(2) 7X-1715 Adapter Cable As (3) 9X-1314 Positive lead (4) 9X-1315 Negative lead
Use the 7X-1715 Adapter Cable As (2) and a multimeter in order to check the voltage at wire 118-Gray and wire 200-Black.
Insert 9X-1314 Positive lead (3) into connection 1 or 6 for wire 118-Gray.
Insert 9X-1315 Negative lead (4) into connection 2 or 5 for wire 200-Black.
Check the voltage at HIGH idle and at LOW idle. If the voltage is less by more than .5 volts of the voltage that was measured in Step 3, inspect the harness and inspect the electrical connections for loose wires.
Illustration 3 g00986167
(5) Control switchNote: Move control switch (5) to the OPERATE position in order for the automatic burner control to activate.
Activate the automatic burner control. Observe the voltage while the burner system cycles through the ignition sequence. If a sudden drop in voltage occurs during the ignition sequence, investigate the components that are involved.
Illustration 4 g00986171
(6) Electrical harness for the glow plug (7) Stud
Check the activation period for the glow plug.
Connect the multimeter to harness (6) for the glow plug or to stud (7) on the burner.
Activate the automatic burner control.
Observe the length of time that the glow