Copyright © 1998 General Motors Corp. 6–57
DIAGNOSTIC CODES
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Main code 34 indicates there is a problem with the calibration EEPROM.
Active Indicator Clearing Procedure:
•
Power down
NOTE: Copying and reloading the current calibration into the ECU will not correct the fault.
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 into the EEPROM. Contact your nearest Allison distributor/
dealer for locations qualified to do recalibration. Be certain the calibration and the software level
are compatible.
4. If the code recurs after reprogramming the EEPROM calibration, replace the ECU.
Main
Code
Subcode Meaning
34 12 EEPROM, factory calibration compatibility number wrong
34 13 EEPROM, factory calibration checksum
34 14 EEPROM, power off block checksum
34 15 EEPROM, diagnostic queue block checksum
34 16 EEPROM, real-time block checksum
CODE 34 XX — EEPROM COMPATIBILITY OR CHECKSUM FAULT
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