BUSHING 1182289 - Caterpillar

System Operation Description:Use this procedure to troubleshoot a suspected problem with the CAN data link. Also use this procedure if one of the diagnostic codes in Table 1 are active or easily repeated.
Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
51-9 Engine Throttle Position : Abnormal Update Rate The Electronic Control Module (ECM) did not receive the required message from the throttle actuator. The code is logged.
The amber warning lamp is illuminated.
The red stop lamp is illuminated.
173-9 Engine Exhaust Gas Temperature : Abnormal Update Rate The ECM did not receive the required message from the exhaust temperature module. The code is logged.
The amber warning lamp is illuminated.
The red stop lamp is illuminated.
843-9 Operator Control Panel : Abnormal Update Rate The ECM has not received an expected message relating to the engine state control from the operator control panel. Check that the operator display is connected properly and is receiving power. The code is logged.
The amber warning lamp is illuminated.
The red stop lamp is illuminated.
The engine is shut down.
1442-9 Engine Fuel Valve 1 Position : Abnormal Update Rate The ECM did not receive the required message from the throttle actuator. The code is logged.
The amber warning lamp is illuminated.
The red stop lamp is illuminated. The CAN data link is used to communicate information between the ECM and other control modules that are on the engine. Use this procedure to troubleshoot problems with the CAN data link.This procedure identifies the following problems:
Faulty connectors
Missing termination resistors
Short circuits
Open circuits
Faulty display panelA -9 code that is related to any specific control module may be caused by the power supply circuit to the control module. Be sure to check that the suspect control module is receiving the power before you troubleshoot the circuit for the CAN data link. If you suspect that a power supply circuit may be the cause of the -9 code, troubleshoot the power supply problem first.Note: This engine can be configured by the customer to allow the engine control status to be read from the CAN data link. The parameter for Engine State Control Input Configuration must be set to "CAN Input" for this control. Customer connections for the CAN data link must be made at the terminal strip that is inside the display panel. The customer must provide the control switch, the wiring, and the termination resistor for this configuration.A problem with the CAN data link is probably caused by the following problems:
Short circuit to ground
Open circuit in the harness
Short circuit to another voltage sourceThe next likely cause is a problem with a control module that is connected to the data link. The least likely cause is a problem with the ECM.
Illustration 1 g02404882
Schematic for the CAN 1 data link
Illustration 2 g02406580
Schematic for the CAN 2 data link
Illustration 3 g02417796
Locations of the components that are on the CAN data links
(1) ECM control box
(2) Throttle actuator
(3) Display panel
(4) Fuel actuator Test Step 1. Inspect the Electrical Connectors and the Wiring
Remove the electrical power from the ECM.
Illustration 4 g02416456
Location of