![]() It is advised that if you don’t understand the DTC codes even after reading the OBD manual you take the codes to a vehicle repair shop to be interpreted for you instead of rushing to purchase a component or system replacement part. The problem with fault codes is exuberated by the fact that there is an increase in the numbers of auto part stores that will try to take advantage of motorists who panic on getting an MIL by selling them a replacement part as a solution for switching off the “Check Engine Light”. Types of Fault Codesĭiagnostic Trouble Codes or OBD codes can be challenging to understand for even professional mechanics. ![]() Transmission Shift Solenoid (TSS), Vehicle Speed Sensor (VSS), Vehicle Speed Sensor (VSS), Camshaft Sensor (CMP Sensor) and Crankshaft Sensor.Īll these sensors contribute to the DTC codes that will be reported by a vehicles On-board diagnostic system. There are multiple other sensors that play a critical role in a vehicle. The information is necessary for determining the required fuel mixture to enable the most ideal combustion. This is the car’s sensor that is used by the ECM to compute the amount of pressure inside the intake manifold. The computer will then try to prevent the continuation of the knocking by adjusting the timing. This sensor is represented by a tiny microphone that is bolted onto the engine block.Ī small electrical charge will usually be sent to the computer when the engine causes a “knock”. There is a normal amount that is expected and if the Oxygen sensor reads either a limitation or an excess in this it reports an error code and the PCM will set on the Malfunction Indicator Lamp (MIL) when the problem persists. This sensor is used to compute the oxygen amount in the exhaust after combustion has occurred in the cylinder. The Oxygen sensor or O2 sensor is located on several different places on the exhaust manifold and mostly also on the downstream side of the catalytic converted (CAT). On some vehicle models, these sensors can easily be cleaned to clear a TPS fault code. This is the sensor used by the vehicle in determining the distance that the gas pedal goes when pushed down. Most cars will either have a mass airflow sensor or a manifold absolute pressure sensor (MAP) but not both. This information is what is then used to calculate the right amount of fuel that should be put into the vehicles engine. The MAF sensor is used by the vehicles computer in determining the amount of air flowing into the engine. In order to comprehensively understand fault codes, it’s necessary to understand the different car sensors in an OBD vehicle. In fact, DTC codes are reports generated from the functioning of car sensors. Types of Car SensorsĬar sensors are the main source of information for OBDs. Replacing the sensor itself will therefore not solve the problem and it’s prudent that the driver or technical decodes the underlying problem.įault codes can sometimes also be triggered by fault that occurred a long time in the past.įor example an MAF sensor that has accumulated dirt over time might cause a vehicle to overcompensate in its fuel-trim adjustments which consequently will result in a report of fuel mixture problems by the oxygen sensors. When a DTC reports a sensor fault, the fault will mostly be resulting from two main spots the system being monitored by the sensor, or the wiring to the sensor. This is mostly not the case because in a modern automobile, the ECU is responsible for monitoring a dozen other sensors.įor this reason, it’s recommended that one refers to the service manual for a vehicle together with the right testing in order to supplement the result of the DTC faults before taking any actions like replacement of a component or part of the automobile. The manual is what a professional or any knowledgeable driver can use to determine the systems, components and circuits that he or she should test to diagnose the vehicles fault.įor most drivers, the only indicator of a DTC fault registered in their vehicles Electronics Computer Unit (ECU) is a Malfunction Indicator Lamp (MIL) or “ Check Engine Light” that usually appears on the dashboard. ![]() ![]() On-board diagnostic systems (OBD) have undergone a considerable evolution from 1996 when they were first introduced in the US, and so have the protocols that the computer uses to respond to the DTC faults.Įvery vehicle with an OBD also comes with a manual for fault codes. Technicians can use the codes to diagnose the problem in causing the OBD to report the fault. DTC faults or Diagnostic Trouble Codes are the codes generated and stored by a vehicles On-board Diagnostic system indicating that a part or section of the vehicle is malfunctioning.ĭTC Codes identify a specific problem area.
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