CAT 3406E (Prefix 1MM or 2WS) Fault Code: 42 PID: SPN: 22 FMI: 11 Primary to Secondary Engine Speed Signal Calibration
The Engine Control Module (ECM) detects the following conditions:
•A timing calibration has been successfully completed.
•The primary engine speed/timing sensor and the secondary engine speed/timing sensor are off by more than three degrees.
Probable Causes:
1) Cluster gear is not properly aligned or it has damage
2) If cylinder head was removed, backlash for camshaft be out of spec
3) Engine speed sensors not installed properly
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SERVICE MANUAL 3000 AND 4000 SERIES GEN 4 GENERATION – ALLISON
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