HARNESS AS-CAB 3205885 - Caterpillar

Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
1632-9 Backup Engine Control Module : Abnormal Update Rate     Communication with the secondary Electronic Control Module (ECM) cannot be established within three seconds after the Primary ECM is powered up. After communication with the secondary ECM has been established, communication stops for one second.     The ECM will log the diagnostic code. The secondary ECM will not be available for engine control.    
1435-9 System Master Control Module : Abnormal Update Rate     Communication with the primary ECM cannot be established within three seconds after powered up. After communication with the primary ECM has been established, communication stops for one second.     The ECM will log the diagnostic code. The primary ECM will not be available for engine control.    Note: This procedure checks for an open circuit or for a short circuit in the Cat Data Link. If you are experiencing problems with communications between Caterpillar Electronic Technician (ET) and the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" before you use this procedure.The Cat Data Link is the standard data link that is used by the ECM to communicate with Cat ET. The ECM communicates with Cat ET in order to share status information and diagnostic information. Cat ET can also be used to configure the ECM parameters. This information will not be available if communication fails between the ECM and Cat ET.
Illustration 1 g01820576
Schematic for the Cat Data LinkTest Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Turn the keyswitch to the OFF position.
Thoroughly inspect connectors that are associated with the Cat Data Link. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 2 g01312112
Terminal locations at the P1 ECM connector that are associated with the Cat Data Link (P1-8) Cat Data Link + (P1-9) Cat Data Link −
Illustration 3 g01847716
Terminal locations at the interface connector that are associated with the Cat Data Link (P1-8) Cat Data Link + (P1-9) Cat Data Link −
Illustration 4 g01365685
Terminal locations at the service tool connector that are associated with the Cat Data Link (D) Cat Data Link + (E) Cat Data Link −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the Cat Data Link.
Check the allen head screw on each ECM connector for the proper torque. Also, check the allen head screw on the engine interface connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and the connectors appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or the wiring are not OK.Repair: Repair the connectors and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely