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Friday, August 29, 2014
Mercedes (C280) inability to accelerate overhaul
Symptom: a Mercedes-Benz C280 sedan paragraph 95, in the process of moving, accelerating weakness, close to full throttle, the speed can not exceed 3Okm / h, even when the high-speed failure rarely occurs, mainly after the stop, start, and then accelerate process and intermittent. Usually turn off the engine after the ignition switch is turned off, then turn the ignition switch, start the engine, the fault disappears, accelerate normal cars with twenty-three days failures will reproduce. This car had some manufacturers repeatedly checked and replaced the temperature sensor, crankshaft position Multidiag Pro sensor and oxygen sensor straight and other components, the failure was not ruled out.
Maintenance process: using red box SCANNER diagnostic check, enter the OBD-Ⅱ diagnostic mode, first read the engine system fault code is displayed as PO000, no fault codes; then enter the numerical analysis, start the vehicle road test, driving all normal at the beginning of and then brake, parking, hard acceleration times of trial and error approach to make a failure, road test more than one hour later, the failure to reproduce the phenomenon, the speed throttle in the end is still below 3OKm / h, and then read the red box SCANNER no fault is still P0000 fault, the analysis of the value found two clues:
(1) when the normal driving, i.e. after starting IGNADV ignition advance angle is 5.5 °, when the engine is 300Or / min to 38 °, normally a strong acceleration; When a fault occurs, idling, acceleration of ignition advance angle showed a negative angle, and sometimes as -6 °, sometimes -2 °, but as long as the ignition switch off, turn off the engine, and then start the ignition advance angle back to 5.5 °, accelerate to normal.
(2) during normal driving, the fuel control system FUEL SYS normal value changes, cold car for OL (open-loop control), hot car for CL (closed loop control), hard acceleration display OL DRV, which is a positive instruction is executed by the engine automotive diagnostic tool computer normal program concentrated injection, when the failure occurs, hard acceleration weakness, the display OL FLT, which is the meaning of the fuel control system damage.
Impact of delayed ignition timing signal mainly KS knock, ECT cooling water temperature, IAT intake air temperature, CKP crankshaft position sensor signal. After testing these signals were normal, but which does not make a bad signal the engine control computer after normal driving twenty-three days before the implementation of the standby function, so we must consider the possibility of damage to the computer. Originally open-loop control, closed-loop control, gear reduction oil, gear oil and rapid acceleration off-enriched fuel trim, etc. These models are controlled by the engine computer. Symptom reflect a sudden change in motion car fuel correction mode, a sudden change in the ignition advance angle, indicating that the engine computer has poor control. This failure to completely rule out the replacement engine control computer.
http://www.obdnews.com/index.php/bmw-diagnostic-tool/
Maintenance process: using red box SCANNER diagnostic check, enter the OBD-Ⅱ diagnostic mode, first read the engine system fault code is displayed as PO000, no fault codes; then enter the numerical analysis, start the vehicle road test, driving all normal at the beginning of and then brake, parking, hard acceleration times of trial and error approach to make a failure, road test more than one hour later, the failure to reproduce the phenomenon, the speed throttle in the end is still below 3OKm / h, and then read the red box SCANNER no fault is still P0000 fault, the analysis of the value found two clues:
(1) when the normal driving, i.e. after starting IGNADV ignition advance angle is 5.5 °, when the engine is 300Or / min to 38 °, normally a strong acceleration; When a fault occurs, idling, acceleration of ignition advance angle showed a negative angle, and sometimes as -6 °, sometimes -2 °, but as long as the ignition switch off, turn off the engine, and then start the ignition advance angle back to 5.5 °, accelerate to normal.
(2) during normal driving, the fuel control system FUEL SYS normal value changes, cold car for OL (open-loop control), hot car for CL (closed loop control), hard acceleration display OL DRV, which is a positive instruction is executed by the engine automotive diagnostic tool computer normal program concentrated injection, when the failure occurs, hard acceleration weakness, the display OL FLT, which is the meaning of the fuel control system damage.
Impact of delayed ignition timing signal mainly KS knock, ECT cooling water temperature, IAT intake air temperature, CKP crankshaft position sensor signal. After testing these signals were normal, but which does not make a bad signal the engine control computer after normal driving twenty-three days before the implementation of the standby function, so we must consider the possibility of damage to the computer. Originally open-loop control, closed-loop control, gear reduction oil, gear oil and rapid acceleration off-enriched fuel trim, etc. These models are controlled by the engine computer. Symptom reflect a sudden change in motion car fuel correction mode, a sudden change in the ignition advance angle, indicating that the engine computer has poor control. This failure to completely rule out the replacement engine control computer.
http://www.obdnews.com/index.php/bmw-diagnostic-tool/
Thursday, August 28, 2014
Audi A6 body vibration at low speed cornering
An ultra 210,000 km mileage Audi A6 4.2L sedan. Users reflect: the car at low speed cornering body vibration.
Troubleshooting:
(A) reflect this customer to our station, the vehicle body vibration at low speed cornering. Maintenance personnel found the car after the test at the speed of about 30km / h cornering, rear KESS V2 continuous vibration (dynamic jump). I stand with VAS5052 check this car, no relevant fault code, read data stream properly.
(2) maintenance personnel through the rear axle differential fault analysis, after replacing some relief in the cool car, hot car remains the same, no troubleshooting.
(3) Check the drive shaft and found no abnormalities.
(4) Try replacing the Torsen differential, test troubleshooting, open black oil have found Torsen differential ablation phenomenon.
Troubleshooting: Replace differential and differential oil.
Failure Summary: not encountered such a fault before, nor have other cases and technical follow, to go one step overhaul detour. That seems more from the principles and theoretical analysis, troubleshooting good.
http://www.uobdii.com/wholesale/original-mercedes-benz-nec-pro57.html
Troubleshooting:
(A) reflect this customer to our station, the vehicle body vibration at low speed cornering. Maintenance personnel found the car after the test at the speed of about 30km / h cornering, rear KESS V2 continuous vibration (dynamic jump). I stand with VAS5052 check this car, no relevant fault code, read data stream properly.
(2) maintenance personnel through the rear axle differential fault analysis, after replacing some relief in the cool car, hot car remains the same, no troubleshooting.
(3) Check the drive shaft and found no abnormalities.
(4) Try replacing the Torsen differential, test troubleshooting, open black oil have found Torsen differential ablation phenomenon.
Troubleshooting: Replace differential and differential oil.
Failure Summary: not encountered such a fault before, nor have other cases and technical follow, to go one step overhaul detour. That seems more from the principles and theoretical analysis, troubleshooting good.
http://www.uobdii.com/wholesale/original-mercedes-benz-nec-pro57.html
Wednesday, August 27, 2014
Tuesday, August 26, 2014
Toyota Corolla car battery power loss
A mileage of about 140,000 km, assembly 2ZR-FE engine of the 2008 Toyota Corolla sedan. Users reflect: the car three days there will be no difficulty in starting the phenomenon is caused by battery power loss. The failure phenomenon has occurred many times.
Failure Analysis: First, the battery using battery tester for testing and found that the battery voltage is low, but the Digiprog 3 test results show good battery needs to be charged, then charge the battery first, to be filled with the test again after placing 2h, show good battery voltage is 12. 67V. Next, the car's parasitic current testing, and found the parasitic current is 122. 6mA, significantly higher than the standard value 30 ~ 50mA, so the car's electrical system description somewhere parasitic current is too big phenomenon. Later communication with the user that the car had installed GPS-ONE anti-theft system), suspected to be caused by parasitic currents Refitting the phenomenon is too large, then the GPS-ONE anti-theft system) v After the addition, the parasitic current is detected again, the results found at this parasitic current is about 6. 61 mA, described at this ialtest link scanner parasitic current is very standard. So you can determine the parasitic current is too large is mainly caused due to electrical conversion.
Troubleshooting: After the installation of electrical equipment removal, troubleshooting.
Failure Comments: After a user to install electrical leakage caused by battery power loss caused by one of the major reasons for the failure occurred demolition can be avoided, but we can not consider the basis of the anti-theft system without removing the GPS on, reduce or avoid excessive current generation do? I believe the answer is yes.
http://autelmaxidasds708sale.blogspot.com/
Failure Analysis: First, the battery using battery tester for testing and found that the battery voltage is low, but the Digiprog 3 test results show good battery needs to be charged, then charge the battery first, to be filled with the test again after placing 2h, show good battery voltage is 12. 67V. Next, the car's parasitic current testing, and found the parasitic current is 122. 6mA, significantly higher than the standard value 30 ~ 50mA, so the car's electrical system description somewhere parasitic current is too big phenomenon. Later communication with the user that the car had installed GPS-ONE anti-theft system), suspected to be caused by parasitic currents Refitting the phenomenon is too large, then the GPS-ONE anti-theft system) v After the addition, the parasitic current is detected again, the results found at this parasitic current is about 6. 61 mA, described at this ialtest link scanner parasitic current is very standard. So you can determine the parasitic current is too large is mainly caused due to electrical conversion.
Troubleshooting: After the installation of electrical equipment removal, troubleshooting.
Failure Comments: After a user to install electrical leakage caused by battery power loss caused by one of the major reasons for the failure occurred demolition can be avoided, but we can not consider the basis of the anti-theft system without removing the GPS on, reduce or avoid excessive current generation do? I believe the answer is yes.
http://autelmaxidasds708sale.blogspot.com/
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