CAT 3406E (Prefix 1MM or 2WS) Fault Code: 25 PID: SPN: 102 FMI: 4 Boost Pressure voltage low
The Engine Control Module (ECM) detects the following conditions:
•The signal voltage from the boost pressure sensor is greater than 4.95 VDC for more than two seconds.
•The ECM has been powered for at least two seconds.
•The engine is not running or the rack position is less than 50 percent with the engine retarder off.
Probable Causes:
1) ECM Connection/Harness
2) Crankcase breather plugged
3) Pressure sensor
4) Pressure sensor harness
5) ECM Failure
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