F 150 4WD Pickup V8-5.4L CNG VIN M (2001)
P1890 - P1894: Testing and Inspection
P1893
P1893 is an information code (there is no testing for this code).
Code Description: Transmission Automatic 4-Wheel Drive 4x4 Mechanical Lock Output Circuit Short to Battery.
Refer to wiring diagrams to diagnose this circuit, See: Transmission and Drivetrain/Transfer Case/Diagrams
If there is no link in the chart then:
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This code is not a valid code for this vehicle
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Or information published by the manufacturer for this vehicle did not include this code
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For complete diagnosis of the Transfer Case, follow this link: See: Transmission and Drivetrain/Transfer Case/Testing and Inspection