DTC Lincoln U0401-09 Short Explanation
Channel: Maxidot Lincoln
Date: 25/07/2020

The video focuses on the basic Lincoln specific diagnostic error code.
Contents:
0:21 Basic DTC analysis according to OBD2 protocol standard.
1:48 Insight into programming
- an explanation of what a bit is and how a byte is formed
- decoding the Error Code to the base programming
2:58 A diagnostically understandable description of the Diagnostic Trouble Code
3:05 Basic error definition
- Possible causes or errors of the car and its parts describing the mentioned error

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Make:
Lincoln
Code:
U0401 09
Definition:
5-Volt Reference Voltage A Circuit Malfunction
Description:
Engine started,engine running,system voltage more than 6.3v,and the PCM detected the 5v VREF A was less than 4.88v or more than 5.12v for 5 seconds within a 10 second sample during the CCM test.
Cause:
VREF circuit is open (an internal fault inside the PCM)VREF circuit is shorted to ground (an internal fault in the PCM)VREF circuit shorted to ground between a sensor and the PCMPCM has failedTSB 01-04-S001 (7 or 01) contain information rel
Failure Type:
Component Failure
This sub type is used for Component Failures that cannot be assigned to a specific sub type.