DTC Ford P0491 Short Explanation
Channel: Maxidot Ford
Date: 2020-07-10

The video focuses on the basic Ford 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:
Ford
Code:
P0491
Definition:
Left Rear Wheel Speed Sensor Signal Range or Performance or Intermittent
Description:
Case 1 A failure is detected after 22 loops if 1. The original wheel speed does not reach the extrapolated speed or the reference speed (Vref),2. The number of interrupts from the wheel speed sensor are continuously &gt; = 40 per loop.※ If the original wheel speed changes erratically.Case 2 A failure is detected after 15 confirmations has been counted.※ Confirmations starts if the comparison between the number of detected and the number of expected pulses shows at least one missing pulse.A confirmation counter will be incremented if the erroneous speed signal characteristic is detected.
Cause:
 Improper installation of wheel speed sensorAbnormal Rotor and wheel bearingFaulty Wheel speed sensor(FL)Faulty HECU