CIRCUIT DESCRIPTION:
The Transmission Control Module (TCM) performs an internal memory self-test at power up that writes and reads patterns at specific RAM locations to verify that all addresses and data lines are functioning correctly.
ACTION TAKEN WHEN THE DTC SETS:
1. The CHECK TRANS light illuminates.
2. DTC is stored in the TCM history on next key cycle.
3. The TCM returns to the boot program.
4. The TCM inhibits shifts to range.
CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LIGHT
Replace TCM.
DIAGNOSTIC AIDS:
Replace TCM.
Allison 1000 & 2000 Gen 5 Fault Code:P0603 Internal Control Module Keep Alive Memory Error
Allison 1000 & 2000 Gen 5 Fault Code:P0602 TCM Not Programmed
Allison 1000 & 2000 Gen 5 Fault Code:P0563 System Voltage – High
Allison 1000 & 2000 Gen 5 Fault Code:P0562 System Voltage – Low
Allison 1000 & 2000 Gen 5 Fault Code:P0561 System Voltage – Performance
Allison 1000 & 2000 Gen 5 Fault Code:P0218 Transmission Fluid Over Temperature
