1, 2 and 3 Digit Codes: 17

NAME OF CODE
17 - Internal Controller (RAM check failure)

WHEN MONITORED
After a reset (ignition key turned to the RUN position or after cranking engine).

SET CONDITION
Data read from at least one RAM location does not match data written to it. The code sets in less than I second if the RAM checksum does not match a known constant.

NOTE: This calculation utilizes internal registers that are not accessible to the DRB.

THEORY OF OPERATION
When the controller is reset, the microprocessor checks the integrity of each RAM location by writing to it and reading back from it. The read value should be the same as the value written. This code causes the transmission to go into limp-in mode.

POSSIBLE CAUSES
- Internal controller failure