VIDEO

Informace

Lincoln

Lincoln P21D5

See the basic definition of a diagnostic error. This will help you to clarify the main causes of the fault code. You will understand the program of the control unit
Basic DTC analysis according to OBD2 protocol standard.

OBD2 or On-Board Diagnostics displays messages for basic group styles. More comprehensible code composition has been standard since 2000. The DTC code consists of five characters and its composition will be shown in this video

Insight into programming

The basic unit for the operation of any computer is the bit. Logic 0 and 1 are expressed by a single bit. Diagnostics The error code is composed of 16 bits. The first two bits define one of the four basic circuits. The video will show you a comprehensive overview of the composition of the error report

A diagnostically understandable description of the Diagnostic Trouble Code

Lincoln P21D5

Basic error definition

Right Front Wheel Speed Sensor Signal Invalid No Signal

Cause of DTC

Signal Missing, Speed Too Low Vehicle Speed gt; = 10 km h (6.2mph) (Drive-Off Detection) A failure is detected at all wheel speed sensors with a speed of lower than 2 km h if the speed of the fastest wheel (Vamx) is continuously above 10 km h longer than 180 s. - The monitoring function is always started if Vmax drops below 10 km h or if Vmin reaches 2 km h (1.2mph) . Vehicle Speed gt; = 15 km h (9.3mph) (Drive-Off Detection) A failure is detected at all wheel speed sensors with a speed of lower than 6 in case of the following condition. 1. Immediately if the speed of a non-driven wheel reaches 15km h. 2. Immediately if the speed of a fastest wheel(Vmax) reaches 15km h without detected overspinning. 3. The speed of a fastest wheel(Vmax) is continuously above 15km h with overspinning detected by deceleration phaes. 4. The speed of a fastest wheel(Vmax) is continuously above 15km h with detected overspinning. - The monitoring function is always started if Vmax drops below 7 km h (4.3mph) and Vref drops below 6 km h (3.7mph) , and it is stopped if Vref reaches 6 km h. The entry of the monitoring function may be delayed up to 5s if Vmin gt; 7 km h has been detected before. The monitoring function is stopped if the fastest wheel reaches 13 km h (8.1mph) and no gaspedalactivity is recognized. Vehicle Speed gt; = 15 km h (Extended Wheel Speed Comparison) A failure is detected at all wheel speed sensors satisfied with the following conditions for more than 120s. 1. Vmax gt; = 15km h (9.3mph) and Vmin lt; = (0.4 Vmax) 2. Vmax gt; = 40km h (24.9mph) and Vmin lt; = (0.6 Vmax) Control Cycle Too Long A failure is detected if the duration of permanent pressure reduction or pressure holding phases exceeds for 28s.