CODE 51 ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY (EEPROM) FAILURE (HISTORICAL CODE 51 ON DDR).

TM 9-2320-364-20-1

2-13. DDEC II TROUBLESHOOTING (CONT).

A4 CODE 51 ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY

(EEPROM) FAILURE (HISTORICAL CODE 51 ON DDR).

INITIAL SETUP

Tools and Special Tools

Equipment Condition

Reader, Diagnostic (Item 53, Appendix G)

Engine OFF, (TM 9-2320-364-10)

Parking brake applied, (TM 9-2320-364-10)

References

Wheels chocked, (TM 9-2320-364-10)

TM 9-2320-364-10

START

KNOWN INFO

TEST OPTIONS

DDR test.

CHECK ENGINE light (CEL)

Is historical Code 51

comes ON and stays ON.

displayed on DDR after

REASON FOR QUESTION

clearing?

POSSIBLE PROBLEMS

Code 51 indicates a memory

problem exists in DDEC ECM.

DDEC ECM faulty.

DDEC ECM is using backup

memory for operation.

Fault corrected.

YES

Replace DDEC ECM

(Para 7-56).