Service Manual
Page 29
... Failure 954 NVRAM Failure 960 RAM Memory Error Note: The controller software also can cause a 939 error code. Contact your next level for correct installation and secure ground. Indicates a DRAM Memory Error on the engine board has failed. Diagnostic Information 2-3 4045-XXX Error Code Action 939 Controller Engine Communications Error The controller board and the engine board...
... Failure 954 NVRAM Failure 960 RAM Memory Error Note: The controller software also can cause a 939 error code. Contact your next level for correct installation and secure ground. Indicates a DRAM Memory Error on the engine board has failed. Diagnostic Information 2-3 4045-XXX Error Code Action 939 Controller Engine Communications Error The controller board and the engine board...