![]() ![]() Walker Products will not be held responsible for any use of this information. The codes listed for this product type are common instances that may relate to your vehicle and should be used as a guide only. OBD II is now the standard in diagnosing vehicle emissions in. GVWR to align them with requirements for applications over 14,000 lbs. GVWR and made changes to the OBD requirements for heavy-duty applications up to 14,000 lbs. In 2008 the EPA finalized OBD regulations for 2010 and later heavy-duty engines used in highway vehicles over 14,000 lbs. In 2005, OBD systems then also became mandatory for heavy-duty vehicles and engines up to 14,000 lbs. Since then, these requirements were adopted by the US EPA for all passenger vehicles manufactured after 1996. The first generation of OBD requirements was implemented in California in 1988. On-Board Diagnostic (OBD) systems are integrated into the computers of our vehicles to monitor emissions. The following OBD II error codes are the most commonly found with this product type. Engine stumbles when going uphill or carrying load.Symptoms of a failing Variable Timing Solenoid may include: When operating correctly, the variable valve timing system can adjust engine timing at specific RPM ranges or under various engine load situations.Ĭommon causes of Variable Timing Solenoid failure: Variable valve timing technology was introduced to increase engine performance without sacrificing fuel economy. The Cam Phaser (VTS) connects the camshaft to the timing belt and keeps the timing belt in the same rotation as the crankshaft depending on the speed and load of the engine for optimum engine performance. The Engine Variable Valve Timing Solenoid (VVT) sends oil pressure to the Variable Timing Sprocket, also referred to as VTS or Cam Phaser, allowing the Phaser to retard or advance the camshaft position.
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