DTC Mazda U0129 Short Explanation
Channel: Maxidot Mazda
Date: 13/07/2020

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:
U0129
Definition:
EVAP Leak Detection Pump Control Circuit High
Description:
Engine started,battery voltage must be at least 11.5v,all electrical components must be off,parking brake must be engaged (to keep daytime driving lights off),automatic transmission selector must be in park,the exhaust system must be properly sealed between the catalytic converter and the cylinder head,coolant temperature must be at least 80 degrees Celsius and oxygen sensor heaters for oxygen sensors before the catalytic converter must be functioning properly and the ground between the engine and the chassis must be well connected.The DME detected voltage irregularity in the leak detection pump control circuit.
Cause:
 EVAP LDP power supply circuit is open EVAP LDP solenoid valve is damaged or it has failed EVAP LDP canister has a leak or a poor seal EVAP canister system has an improper seal Evaporative Emission (EVAP) canister purge regulator valve 1 has failed Leak Detection Pump (LDP) is faulty Aftermarket EVAP parts that do not conform to specificationsEVAP component seals leaking (i. e. ,leaks in the Purge valve,fuel tank pressure sensor,canister vent solenoid,fuel vapor control valve tube assembly or fuel vapor vent valve).