DTC Mazda B1144 Short Explanation
Channel: Maxidot Mazda
Date: 20/06/2020

The video focuses on the basic Mazda 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:
Mazda
Code:
B1144
Definition:
Problem in 1st Clutch and 1st Clutch Hydraulic Circuit (1st gear incorrect ratio)
Description:
The Powertrain Control Module (PCM) computes the ratio of the input shaft (mainshaft) speed to the output shaft (countershaft) speed.When the ratio is not the 1st gear ratio,it is detected as a malfunction of the hydraulic circuit or the 1st clutch.(Symptom 1) The actual gear ratio must match one of these conditions for at least 12 seconds with the 1st gear command:Actual gear ratio is greater than the 1st gear ratio by a factor of 1.2Actual gear ratio is less than the 1st gear ratio by a factor of 0.75 (Symptom 2) The actual gear position is neutral for at least 3 seconds and then the gear up-shifted from 2nd to 3rd,even though 1st gear shift is commanded.NOTE: Before you troubleshoot,record all freeze data and any on-board.snapshot,
Cause:
 Low or dirty transmission fluid Faulty shift valves B and C Faulty ATF pump and the regulator valve Inspect the strainer for metal debris or excessive clutch material,if present replace the transmission