CODES 71-78 INJECTOR RESPONSE TIME TOO SHORT.

TM 9-2320-364-20-1

2-13. DDEC II TROUBLESHOOTING (CONT).

A4 CODES 71-78 INJECTOR RESPONSE TIME TOO SHORT.

INITIAL SETUP

Tools and Special Tools

Equipment Condition

Multimeter (Item 44, Appendix G)

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

Pan, Drain (Item 47, Appendix G)

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

Reader, Diagnostic (Item 53, Appendix G)

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

References

Personnel Required

TM 9-2320-364-10

Two

START

WARNING

TEST OPTIONS

KNOWN INFO

Read WARNING

on Page 2-377

CHECK ENGINE light (CEL)

Visual inspection.

comes ON and stays ON.

REASON FOR QUESTION

POSSIBLE PROBLEMS

Is fuel system free of aerated

fuel and/or contamination?

Fault may be caused by

Aerated or contaminated fuel.

non-DDEC engine or chassis

Charging system faulty.

components.

Bad injector.

Go to Fuel System

Troubleshooting

(Para 2-17).

YES

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