Fault phenomenon
    A Santana 2000, equipped with AFE engine. The car when the gas door when the tempering, can not lift the speed; driving step on the accelerator pedal when the speed does not rise down, serious nausea. The failure is sometimes absent
    Troubleshooting and troubleshooting
    First check and replace the high voltage line, invalid. And then use the diagnostic instrument V.A.G1552 detection, water temperature display is low, oxygen sensor shows mixed gas thick, suspected oxygen sensor damage, try to replace the new pieces after the failure remains the same. Pull out the oxygen sensor plug, the fault phenomenon has improved, suspected exhaust system blockage, so the three-way catalyst and exhaust pipe disconnected, no significant improvement in failure. And remove the nozzle, found a cylinder nozzle seal has been damaged. Replace the apron, loading test, fault still. And then check the ignition timing, timing and cylinder pressure, are within the normal range. In the car during the test process found that when the oil is not added to the intake pipe when the carburetor cleaning agent or pliers clamped back to the tubing, the fault will disappear, indicating that the fault is due to the mixture is too thin due. But why does the instrument show too thick? I was very confused. Measure the battery charge voltage found only 12.7V, lower than the normal charge voltage. Because the car's generator is not the original parts, so that power generation is too small, no further check the power generation is too small reasons. In the repeated launch of the vehicle test process, accidentally found the clutch shell on the battery at the ground there is a spark, the investigation is in the maintenance of the clutch when the cable bolts are not tightened due. Re-tighten it again to test again, to accelerate the strong, rapid response, complete troubleshooting.
    Maintenance summary
    Due to the transmission shell on the fixed battery negative cable bolts are not tightened, the line virtual connection, resulting in the engine during the operation of the generator charging current does not constitute a loop, resulting in the various parameters are not normal, so that the ECU can not work, Not on the oil, the engine state of good and bad fault occurs.
    Special · home · comment
    For the accelerator pedal and the engine speed can not be upgraded and accompanied by the phenomenon of tempering, it is likely that there is a problem with high voltage lines. The author of the first move to replace the high-voltage lines, but did not work, it seems anxious wish not to achieve. The author of the second resort to use V.A.G1552 query fault code, read through the data block, but I do not know whether the author observed 003 group 2 (battery voltage). If you find a problem with the battery should be analyzed to exclude the reasons. Due to poor contact with the ground wire is sporadic, it is possible that the battery voltage is normal. The next step should be analyzed refueling tempering reasons, there are three main aspects: ① mixed gas is too thin; ② no ignition or lack of energy; ③ valve timing is not correct. Should comply with the "power after the machine, the first Jane Fan Fan" inspection principle, first check the ignition failure, the possible reason is the component failure or line problems. For this purpose, the components of the ignition system should be measured, such as the normal components, and then check the ignition signal lines and power supply lines; power supply lines, including positive lines and ground lines. If the diagnosis is clear, it will make the diagnosis step reasonable and fast. The diagnosis of the text is not clear enough, the diagnostic steps are not smooth. But because the author can observe the mechanical parts of the subtle and timely detection of the transmission case of the ground line spark, and thus quickly ruled out the failure.