CODE 34 XX -- CALIBRATION COMPATIBILITY OR CHECKSUM FAULT

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

CODE 34 XX -- CALIBRATION COMPATIBILITY OR CHECKSUM FAULT

Main code 34 indicates there is a problem with the calibration.

Main

Code

Subcode

Meaning

Factory calibration compatibility number wrong

Factory calibration checksum

Power off block checksum

Diagnostic queue block checksum

Real-time block checksum

Customer modifiable constants checksum

Active Indicator Clearing Procedure:

Power down

NOTE:

Copying the current calibration from the ECU and reloading it will not correct the fault. The

calibration must be downloaded directly from PCCS.

Troubleshooting:

1. If the code set is 34 14 and it occurs in conjunction with code 35 00, proceed to find the cause for

code 35 00 and correct it.

2. After the cause for code 35 00 has been corrected, drive the vehicle to see if code 34 14 recurs. If

code 34 14 recurs, proceed to Step (3).

3. Reprogram the correct calibration. Contact your nearest Allison distributor/dealer location quali-

fied to do recalibration. Be certain the calibration and the software level are compatible.

4. If the code recurs after reprogramming, replace the ECU.

5. If the code set is 34 17, reprogram the GPI/GPO package after re-calibration of the ECU.

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