CAT 3406E (Prefix 1MM or 2WS) Fault Code: 26 PID: SPN: 108 FMI: 3 Atmospheric Pressure voltage high

The Engine Control Module (ECM) detects the following conditions:

•The signal voltage from the atmospheric pressure sensor is greater than 4.9 VDC for more than 30 seconds.
•The ECM has been powered for at least two seconds.

Probable Causes:

1) ECM Connection/Harness
2) Crankcase breather plugged
3) Pressure sensor
4) Pressure sensor harness
5) ECM Failure

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