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  1. Park Assist is an automated parking aid that helps drivers park with greater precision, using guidance system technology that rivals ultrasonic and other camera-based solutions with superior, advanced technology. Park Assist also helps minimize the chance for potential scratches and dings that happen when steering into very tight spaces. Although many experienced drivers have no qualms about tricky parking. When we say parking assist module has issue, the behaviour is front and rear bumpers alarm system doesn’t work, press the button for parking assist but no reaction. The car in this case is Land Rover 2010, and when use Topdon Artimini to access parking assist module(PAM), but failed to do that showing communication failure. And now scan the whole systems, the list showing that PAM is not equipped. Now it’s time to scan for fault codes, and we have U0159, lost communication with PAM--Permanent. There’s HELP option below show all the possible reasons: 1. Check PAM power supply including ground wire refer to circuit diagram. 2. Test the performance of CAN 3. Test the CAN performance between PAM and cluster instrument So I checked above one by one, and found that all power supply, fuse and replay are normal, then I found that PAM plug was wet, so checked the PCB of PAM and it’s all rusty. After cleaning the plug and replacing PCB, the PAM worked well. Drive that car for a while to test, and all is well.
  2. Another way to do the throttle re-calibration is through bi-directional test. Since I have introduced bi-directional test before, let’s just analyze the process. The car in this case is Honda 2006, and Artimini. Step: Choose the correct system , which is engine system in this case. Choose throttle position checking. Turn engine OFF, shift to N, engage parking brake. When you choose OK, it will show that throttle position data has been cleaned. And the tool will guide you through ECM/PCM reset, start the engine first, check if any issue with idle speed. After ECM/PCM is reset, run engine for 10mins in idle speed with no load, the idle speed learning will be done. And the whole process is done.
  3. The simplified route for a car is sensor--->car computer--> actuator. Sensors are not just like 2 sensor, tire sensor but also brake paddle, buttons that intake info. And actuators are like engine, window, sunroof, throttle, oil injector......all the components that receive signal from acr computer and act correspondingly. Bi-directional test, also called actuation test, is let the diagnostic tool access car computer and send commands, triggering car actuator to response and convey data back to diagnostic tool. Why is that practical? The bi-directional test lets you test the response of specific system, so that you would know is it malfunctioning. Especially, you are using a diagnostic tool, even when no response from a actuator, you can know for sure if it’s the actuator has problem or car computer has issue with sending command.
  4. Here’s another example for the must process after cleaning throttle body, the car in this case is Buick 2007. The same as before, choose the correct car model and system, the screen will display info of this car like VIN, OS,sub-OS, fuel system, speedometer, engine diagnosis, HW system......you need to confirm if all the info display is correct and if it’s all fine, top OK to proceed. The whole process take 5-50 mins, so ensure battery level is enough. This kind of process doesn’t require manual operation like turn ignition on or others, showing that different models have different ways for throttle relearn.
  5. Firstly, we need to be clear that throttle body needs cleaning when the engine idle is rough, the engine stumbles through acceleration, or the Check Engine Light comes on. When road grime, carbon, and other materials embed in the components that make up the throttle body, the vehicle's ability to efficiently burn fuel is reduced. To clean the throttle body is pure manual and there are many instructions online, but what after that? You need to re-calibrate it, to let car computer know that the clean process is done. And in other cases, like power shut down, replace new throttle, replace related control units, all need re-calibrate/relearn. The car in this case is Benz 2014 212chassis, it’s throttle was just cleaned and need to do this process to stabilize engine idle. Warnings: 1. Ignition is set to ON 2. Internal combustion engine 3. No operation on accelerator pedal 4. No CAN fault in traction system 5. Coolant liquid temperature between 5-100℃ 6. Air intake temperature is not higher than 40℃ Steps: 1. Choose the correct system path: ECM(Engine control module)-service function-stop learning throttle position 2. And the screen displays live data for engine rpm, coolant liquid temp., turbocharger boost sensor temp., gas paddle sensor 3. If any of the readings is not meeting the requirement, the tool won’t allow you to proceed 4. Tap OK on artimini to start throttle learning process and after a min, the process is completed. Each car model and make has different way to do this, but I think the way to confirm if it succeed is to check engine idle.
  6. A longitudinal acceleration sensor is part of a set of sensors (which also include the lateral accelerometer, roll rate, and yaw rate sensors) that are all responsible for the stability of your car as it moves. They're responsible for ensuring that your vehicle body movement is as balanced and controllable as possible by steering wheel. A very common situation that longitudinal acceleration calibration is needed is disassemble and re-install parking brake module. And as usual, it’s not the calibration is the difficult part, it the preparation work and don’ts, the calibration is carried out by diagnostic tool. What need us pay more attention is that ensure the battery voltage over 12.5V and car stay still horizontally and engine is off, shifted to P. But these days almost all diagnostic tool(I use artimini) that have this service function--Parking Brake Module--have all hints you need for the whole process. So it looks like the daily word is not that hard to work at dealer shop.
  7. I have introduced two types of how vehicle computer, one is to measure tire height manually, and the other one is to let the diagnosis tool recognize tire types(pre-installed in the tool) for certain car models. Now the third one is you just input the sensor ID in the tool manually. The car in this case is Chrysler 2008 Compass, tool is Artimini, and tap into Wireless Control Module, then choose left front tire sensor programming. Input the 8 digit sensor ID, which usually on the back of that sensor. And that’s it, you just input the sensor ID and all is done. In a word, different cars have different operations, and for a repair shop to remember them is impossible, just have a good tool and all tips and hints are in it.
  8. There are 16 pins of OBDII interface, from top to bottom, from left to right, mark them as 1-16. PIN4 is Chassis Ground Pin 5 - Signal Ground Pin 6 - CAN High (J-2284) Pin 7 - ISO 9141-2 K Line Pin 10 - J1850 Bus Pin 14 - CAN Low (J-2284) Pin 15 - ISO 9141-2 L Line Pin 16 - 12V Battery Power Sometimes when you connect OBDII code reader to your car OBD interface, it doesn’t work, but works on other cars, you may need to check the OBDII pins, especially PIN4 and PIN16, to check that you don’t need to drive to the dealer’s. Just use multi-meter to test PIN voltage, the normal range of 6PIN should be between 2.5-3V, 14PIN should be between 2.0-2.5V. If these two are not in normal condition, even manufacture tool is useless, the problem is not code reader but that car’s OBDII interface.
  9. Leg room or back support, or a seat that sits at the wrong height, can cause poor posture and lack of control. 5 element should be considered: seat tilt, angle, and height; leg room; and lumbar support. When replacing driver seat component, you’d better do the driver seat adjustment, also if not, fault code will be generated. The car in this case is Porsche Cayenne 2013, and the fault code is 000D02-Forward/backward adjustment of motor. Preparation: Do not interrupt the process, so set the backrest to the upright position at the beginning. Clear all the objects might get stuck and ensure no one is in the car. Steps: 1. Choose the correct car model and system(driver seat memory) 2. Display hints: need to code the ECU before standardizing seat motor 3. Display warning: ensure there no other fault codes stored other than driver seat position 4. And then the tool will communicate with car computer to do the backwards correction and then forward correction. The whole process is complete.
  10. I once posted about changing tire tire pressure sensors, and need to write in the new tire data in car computer(ECU), and that one requires measuring tire height manually. Now I will introduce another way that fully automatic, the car is Chrysler 2009 Journey. First turn ignition ON, and go into Body Control Module-->program tire size using diagnostic tool, I’m using Topdon Artimini. This step is mainly to update tire circumference data, and device will auto read out the current tire circumference data is 2115mm. Then it will list all available tires for this car model, choose the one you are installing now, and all is done.
  11. Sometimes I mention reading fault codes and live data of specific system, and sometimes I say matching/reset/learning...the former ones are basic functions that almost all code readers have(but for different systems), and the latter ones are for pros like technicians in repair stores. Fortunately, when I say read codes and live data before in misfire related posts, I mean data of engine system, and almost all code reader can read this system, because the very basic use of code reader is to read emission data, so this kind can access engine system. Some code reader can even access air bag system, brake system......and usually it works on almost each car that have OBDII, so some people call it OBDII scanner. And for initialization, matching and writing in data in other car systems like tire pressure sensor, brake pad sensor, oil reset, change of battery, steering angle learning.....we call this kind diagnostic tool. Performing maintenance service, including Oil Reset, EPB, TPMS, BMS, Brake Bleed, DPF, IMMO Keys, Injector, SAS, Suspension, Throttle, WIN DR ROOF, Seats, Odometer, Lang Change, Headlamp, CHG Tire Size, TEC Learn, ABS/SRS, Cylinder, Turbocharging...... This diagnostic tool usually can works on most vehicles, but sometime if you want to access specific system, you better confirm the year and that system of that car and check with seller.
  12. When engine shaking, idle speed not stable, CEL is ON, the cause could be so many. I introduce two situations before, and now I want to talk about when two fault codes occur and clear them at the same time. The car in this case is Buick GL8 2010, tools is Topdon Artipad. And like before, when we have these two codes, go to live data. Live data is a very accurate way to know which part has issue. Check long term fuel trim bank 1 and bank 2 data, if they are higher than 20%. This Buick--bank 1 is 20.78%, and bank 2 is 13.72% The reason for bank1 could be various, oil pressure, fuel injector, carbon deposit, vacuum tube, air leak or air flow meter. Check each part from easy operation to hard. Listen if there’s any airflow sound, if so, maybe vacuum tube off, like this pic. Re-plug the vacuum tube, and scan for fault code again, P219A has gone, only P0300 left. Idle speed is already lower, but engine is still shaking. Check the ignition system, ignition coil, spark plug and related circuit...and then found spark plug burnt, like the right ones in below pic. After changing spark plug, all is fine now.
  13. Too much weight, shocks, hits and change of headlight will require headlight adjustment, to realign them. Preparation: The vehicle has to installed Headlight control module, and should be stay horizontal, steering wheel in the middle and no passenger/weight. Go into the HCM, and turn ignition ON, turn dipped light ON, manually realign these lights. And then tap OK on tablet to writing in data. Turn light off and ignition off. All done.The tool; I use is topdon artipad.
  14. I have introduced so many cases using pro diagnostic tool before to solve car issue, like brake paddle, car key, TPMS and O2 sensor......it’s almost like I’m advertising, so I gonna show how to reset Oil Maintenance in Lexus by manual, not using any tool. The car is Lexus 2015. 1. Press central control console, choose “settings, editing” 2. Go into vehicle, to enter vehicle setting page 3. Choose maintenance, and choose change engine oil 4. Now the page is to set date and mileage, following the system instruction to set to current date. Some car has this function, to let car owners do it themselves, which can save a lot of money!! Like it!!
  15. There are also sensors in windshield wipers, optical or capacitive, to monitor rainfall. So the same as tire sensor and O2 sensor, we need to write the new sensor info into ECU after replacing or repairing windshield wiper, I would like to call it initialization. Mostly is to adjust the initial position. Preparation: 1. Keep car stay in horizontal 2. Make sure battery level enough, no obstacles on the window 3. Don’t use brute force when adjusting the windshield wiper manually, or it would burn the windshield wiper engine. Steps: 1. Choose the correct car model, in my case is Ford Kuga 2013 2. Choose the correct system 3. And the tool reminds to do the initialization inside the car 4. Check car status and if the windshield wiper is correctly installed, battery voltage is enough, windshield glass is clean and dry. If meets requirements, turn ignition ON 5. This step is pure manual operation: 1) Swipe down windshield wiper 3 times within 5s but in even pace 2) Swipe up to initial spot, buckling it to A shape 3) Swipe down to standard spot 6. Turn ignition OFF Done, actually, the most difficult part for initialize windshield wiper is the manual operation, and different cars have different procedures.
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