CODES 52 OR 56 DDEC ECM - ANALOG TO DIGITAL FAILURE.

TM 9-2320-364-20-1

2-13. DDEC II TROUBLESHOOTING (CONT).

A4 CODES 52 OR 56 DDEC ECM - ANALOG TO DIGITAL FAILURE.

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)

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

References

TM 9-2320-364-10

START

KNOWN INFO

TEST OPTIONS

CHECK ENGINE light (CEL)

DDR test.

Are Codes 52 or 56 the only

comes ON and stays ON.

active codes displayed on

REASON FOR QUESTION

DDR?

POSSIBLE PROBLEMS

Code 52 and Code 56 indicates

the DDEC ECM is unable to

DDEC ECM faulty.

correctly convert sensor

voltages into numbers for

computer usage.

Service other codes

first. Go to Fault

YES

Replace DDEC ECM

(Para 7-56).