CAT 3406E (Prefix 1MM or 2WS) Fault Code: 66 PID: SPN: 54 FMI: 5 Auxiliary Output #06 current low
The Engine Control Module (ECM) detects the following conditions:
•Three attempts to complete an Eaton Top 2 shift were unsuccessful.
•The “Transmission Style” is programmed to “Eaton Top 2”.
Probable Causes:
1) ECM Connector/harness
2) Shift solenoid failure
3) Shift solenoid relay
4) Wiring between shift solenoid and ECM
5) Gear ratios are programmed incorrectly in the ECM
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SERVICE MANUAL 3000 AND 4000 SERIES GEN 4 GENERATION – ALLISON
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