3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B and 3516C Engines Caterpillar Monitoring System Caterpillar

This diagnostic code is recorded when the Main Display Module does not receive expected information from the Quad Gauge Cluster Modules. When the Main Display Module sends information to the Quad Gauge Cluster Module, the Quad Gauge Cluster Module sends information back to the Main Display Module. The returned information verifies that the Quad Gauge Cluster Module has correctly received the original information that was sent from the Main Display Module. When the Main Display Module does not receive the expected information, the diagnostic code is recorded. As a result, the Quad Gauge Cluster Modules may not respond to the information that is sent from the Main Display Module while the Main Display Module is in Normal Mode (Mode 0). Check for loose connections to the display data link or poor connections to the display data link. Check for opens or shorts in the harness wiring of the display data link. During the self test, problems with the Quad Gauge Cluster Modules can be determined. The self test occurs immediately after turning the "ECS" switch from the OFF/RESET position to the AUTO position, the MAN/START position, or the COOLDOWN/STOP position. For more information on this subject, see Testing And Adjusting, "System Self Test".

Note: This diagnostic code can also be caused by a harness code that is not correct for the application. A mismatch with the harness code is not likely to be the cause of this diagnostic code in an application that has been working normally in the past. In a new installation, a mismatch with the harness code is most likely to be the cause of the diagnostic code. For more information regarding the selection of harness codes, see Systems Operation, "Quad Guage Module".