TROUBLESHOOTING CHARTS (Cont.) -726280604

TM 9-2320-364-20-1

2-14. DDEC III/IV TROUBLESHOOTING (CONT).

Section IV. TROUBLESHOOTING CHARTS (Cont.)

FLASH CODE:

DDR DISPLAY:

XXX INJECTOR RESPONSE TIME SHORT

SAE J1587 CODE:

SID: XX FMI: 1

Indicates that the time it takes from when the DDEC III/IV ECM requests an injector be turned on to when the in-

jector solenoid valve actually closes is shorter than the lower limit of the expected range. This diagnostic condi-

tion is typically:

(1)

aerated fuel system

(2)

high system battery (+) supply voltage

(3)

failed solenoid valve

NOTE: The injector diagnostic SID (Subsystem IDentifier) indicates which cylinder number has an injector with a

short response time. The injector number describes the cylinder and/or bank which has the injector with

a short response time.

Injector response times generally increase with low battery supply voltage and decrease with high battery

supply voltage. Although injector response times vary from injector to injector at a given RPM, each indi-

vidual injector response time should remain relatively consistent from one firing to the next. Wide varia-

tions in response time (typically +/-- 0.2 msec) for one injector at a steady engine RPM may indicate an

electrical problem (faulty alternator or voltage regulator, poor or broken ground cables, etc.).

FLASH CODE:

DDR DISPLAY:

ECM BATTERY VOLTAGE HIGH

SAE J1587 CODE:

PID: 168 FMI: 0

Indicates that the DDEC III/IV ECM has detected that the main battery supply voltage to the ECM has exceeded

the recommended operating range.

FLASH CODE:

DDR DISPLAY:

ENGINE OVERSPEED WITH ENGINE BRAKE

SAE J1587 CODE:

PID: 121 FMI: 0

Indicates that the engine RPM has exceeded the recommended safe operating range.

FLASH CODE:

DDR DISPLAY:

ENGINE OVERSPEED

SAE J1587 CODE:

PID: 190 FMI: 0

Indicates that the engine RPM has exceeded the recommended safe operating range.

FLASH CODE:

-- --

DDR DISPLAY:

FRAM CHECKSUM INCORRECT

SAE J1587 CODE:

SID: 240 FMI: 2

Indicates that the ECM system operation software has been corrupted and is unable to operate. This diagnostic

condition is typically:

The ECM system programming operation failed to run to completion. Replace ECM (para 7-57).

FLASH CODE:

-- --

DDR DISPLAY:

INCOMPATIBLE CALIBRATION VERSION

SAE J1587 CODE:

SID: 253 FMI: 13

Indicates that the current ECM system operation software is not compatible with the engine calibration loaded in

the ECM. This diagnostic condition is typically:

The ECM programming process was performed in the incorrect order or did not run to completion. Replace ECM

(para 7-57).

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