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Shanghai Volkswagen Passat sedan failure 3 cases

Case 1

a 2008 annual Passat 2.8 V6 sedan with automatic transmission, mileage is 23,400 km, reflects the owner dashboard airbag warning light lit, asked for the claim maintenance.

After receiving the query failure diagnostic VAS5052 connecting car airbag control unit J234, we found a fault information 00588 stored, meaning the driver’s side airbag igniter N95 too much resistance, sporadic. 15-08-001 group zone 1 is read measured value is too high (normal value should be correct). The maintenance experience, there are generally fault code 00588 airbag spiral cable assembly with a poor contact, the decision to replace the airbag with a steering angle sensor coil cable new component of G85.

After the job is finished, when the ignition switch is ON, the airbag warning lamp, ABS warning lamp and a warning lamp lit simultaneously ESP. Using the scan tool into the airbag control unit, clear fault code 00588, the airbag warning lamp goes out. Into the ABS / ESP control unit J104 query failure information, find fault memory 2, respectively 00778mdash; mdash; G85 steering angle sensor is not basic setting / setting error; and 01044mdash; mdash; the control unit error codes.

According to the characteristics of the Audi, Passat ABS / ESP control unit, a steering angle sensor in replacing G85 or ABS / ESP control unit after J104, coded ABS / ESP control unit automatically changes to 0, the need to re-ABS / ESP control unit and the steering angle sensor encodes G85 compensate calibration. It is noted that, at this time can not directly control the coding unit and a basic set of G85, must be performed only after a successful sign-on function.

The vehicle in a straight horizontal position, with the specific path VAS5052 fault diagnostic operation is performed as follows: enter the self-diagnosis function, click options ABS control unit into the interface, then the upper right of the viewing screen of the display encoded fields 0 is encoded. 10 into the selected measurement value option, view data block area 005 the set of measurements is 1 G85, should plusmn; 5.0deg; the range, if the value is greater than the absolute valueTrace 5.0deg ;, turn the steering wheel in the tolerance range of the digital, and then returned to the interface options. Select option 15 to enter the access permissions, the display soft keyboard appears, type 9597 login code, press the Enter key Q, the top left of the screen prompts the successful implementation of this function, return options interface. Select 09 into the encoding option, the soft keyboard appears, enter the encoding ABS / ESP control unit number 4297, press the Enter key Q, top right column shows the 4297 coding (0), prompted the upper left is executing code. Return options interface, coding column shows the coding control unit for 4297, indicating that the coding is successful.

again select 15 to enter the access permissions screen soft keyboard appears, type 40168 login code, press the Enter key Q, screen prompts to successfully perform this function. Return the options screen, select 06 basic settings, soft keyboard appears, enter the channel number 1, press the Enter key Q, the basic set of interface screen appears, click the button to activate the basic setting, the screen display setting success. Re-query the fault information ABS / ESP control unit, fault codes 00778 and 01044 are automatically cleared to exit self-diagnosis, ABS and ESP lamp goes out, after the road test failure is no longer present, the end of maintenance, the car will be returned to customers.

reviewed: the steering angle sensor is integrated in the airbag spiral cable assembly, the airbag system to exclude the error code and the steering angle sensor working on the initial point of contact with the calibration of ABS / ESP control unit together , it shows the relationship between the modern car electronic control systems are becoming increasingly closer. If not familiar with these corresponding operation method, maintenance will stranded halfway. After encoding of G85 compensation calibration is unsuccessful, the value of the measured values ​​should be checked again. 1 005 G85 group zone should be within the tolerance range. 2009 listing of the new Passat 1.8T car equipped with the BOSCH 8.0ABS ESP system also has a function of encoding the control unit is 273/263 (automatic / manual), the replacement of the steering angle sensor G85, ABS / ESP lights, the query only 00,778 of the fault memory, it is unnecessary to perform encoding program, compensation calibration can be activated only G85, a method as described above.

Case 2

a 2008 annual Passat GLS 1.8T automatic car navigationAccumulated mileage 16000 km, station owners to repair radio information area on the instrument panel multifunction display no display, multifunction steering wheel on the right button to adjust the volume can not be controlled, nor can select tracks and stations, give maintenance requirements.

FIG 1

Basic authentication checking the true owner, the normal turn on the radio, the radio information area above the instrument should display the volume and track, and the current this region actually was black state (FIG. 1), the same as the radio is not turned on. Itself using radio buttons and knobs, volume control, and music selection showed normal, but can not use the steering wheel up or down button selections and volume control.

FIG. 2

The circuit diagram of a multifunction steering wheel Passat car (FIG. 2) analysis, which is the principle multifunction steering wheel controls the operation unit E221 the right side of the steering wheel radio control buttons E441 (volume + volume – up and down selections selections) into a modulated data signal, the LIN bus transfer to the multifunction steering wheel control unit J453 (the relay 451, the relay melt wire board 8 and 9), then the control unit J503 to radios and navigation systems with operator comfort system unit via CAN data bus. J503 After receiving the data, or perform volume adjustment instruction to select a track, and the execution result to the meter control unit via a data bus J285, displays the current volume and track.

Analysis of the steering wheel is not the right button E441 selections and control the radio volume control, to the following factors: ① the steering wheel and the right button E441 multifunction steering wheel operating unit E221 is not output a modulated signal; ② failure multifunction steering wheel control unit J453, J503 leads to the control unit with the operation unit can not transmit data to the radio and the navigation system; ③ amenity system data bus failure; ④J503 faulty, transmission of the data bus can not receive.

Table 1

into the connector J503 V.A.G1552 failure diagnostic query, trouble code storage.Into the multi-function steering wheel control unit (16 address word) access, no fault memory. Query measurement data block group 001, respectively, pressing each key E441, the screen displays the measurement value appears district variation (Table 1), a data block group meaning 16-08-001 zone 1 is the volume of a steering wheel on the right side button – of measured value, the volume + region 2 is the measured value of the key, a downward region 3 selections / key table value selected from the measurement, a measurement region 4 up cue / channel selection. From Table 1, the multifunction steering wheel control unit J453 has been identified to said key signal, a key factor in the steering wheel E441 are excluded. Group measured value detecting 16-08-125: comb (combination meter) 1 2-wire.. Inquiry into the meter control unit J285, comfortable memory system and multifunction steering wheel without losing communication communication 3 occasional trouble code, clear fault memory but still observable phenomena, the query again no fault code appears. 17-08-130 measured value detection area group 1, the display system data bus comfort 2-wire operation; measured value group 132 St.wheel (multifunction steering wheel) 1. Since the J285 is no radio and navigation system loses communication fault memory, indicating a comfortable system CAN data bus communication is normal, comfortable data bus system failure may be excluded.

To verify whether the transmission signal J453, cruise switch is turned on, the instrument cruise lit, 16-08-002 group is a measure of the steering wheel on the left side of the cruise control buttons, the sense region 1 is cruising system switching signal acceleration, deceleration region 2 is cruise / sET switch setting signal, zone 3 is the cruise cancel switch signal. These buttons are pressed, the measured values ​​are changes, described multifunction steering wheel control unit has recognized these signals. Now the control unit into the engine block J220 01-08-066 region 4 set of measurements (Table 2), while pressing the respective cruise control switch, the corresponding measured value becomes 0 by 1, described can be received J220 J453 respective modulation signals emitted, the control unit J453 multifunction steering wheel failure may be excluded.

Table 2

for fear of the instrument in question also makes radio information can not be displayed by the fault diagnostic V.A.G1552Terminal 03 on the instrument for execution function, the light section when performing a test, including the information region comprises a radio multifunction display emit red light in a lattice form, appears in the middle of the word TEST 1/4 dot. Press the diagnostic “→” key, LCD dot matrix display TEST 1/4 TEST 4/4 to 4 times, then appeared TEST END (end of the test), no missing dot per-screen display, indicating that the meter multi-function display completely normal (Fig. 3), because radio information can not be displayed on the J285, J503 to this failure and locked on the corresponding line.

Figure 3

apart J503, release CAN data bus connector is located, the pin was visually see anything unusual, but again replacing the rear connector found, the radio information display meter also returned to normal, the steering wheel and can adjust the volume button selections, channel selection, which indicates the presence of the data bus where the connector contact failure, the cause can not receive and J503 send data.

Case 3

a 2007 annual Passat 2.0 manual transmission car, equipped with BFF engine, mileage is 39,600 km. Symptom said the owner Description: Automotive EPC lamp lights up during driving, turn off the engine can not be started again. After several attempts, the engine barely started, and immediately open repair station maintenance.

After receiving the basic vehicle inspection as follows: With the ignition ON, various warning lights on the instrument self-test, in addition to the other outer light does EPC were normal. When starting the starter in normal operation, but the engine start without signs. VAS5052 connection failure diagnostic inquiry into the engine control unit fault memory J220, found diagnostic display system does not exist. J533 gateway into a query, there is a fault storage: 01314– engine control unit without communication. Now set the measurement value of the data block 19-08-125: 0 engine; 126 group: an airbag. J533 view from the query result, the engine can not start because the engine control unit data bus based communication system the power interruption caused.

After a while, so that the engine cooling the ignition switch ON again, found in EPC light meterWhen the self-test is lit, then the engine can be started, but the EPC lamp lit. At this point can enter the diagnostic query J220 memory failure, screen failure identification code to 4, respectively: 17795– internal control unit memory checksum error, occasional; 17751– load detection value exceeds the upper limit, occasional; 17559- – a mixed gas cylinder bank matching system lean range 1, incidental; 16989– internal control unit and error testing ROM currently exist.

Now the measured values ​​related DTC no exception. Reopen the engine stop switch after the ignition was observed, the EPC not bright lights, the engine can not be started again performance state. EPC bright lights off control by the power control unit is an engine system results CAN data bus to transfer information to the instrument, the instrument self-test EPC light is off, the control unit between the engine control unit and the power lost data bus system CAN communication. According to the inspection result of the analysis, the vehicle in a stationary state can not spotty data bus link, we can see the engine control unit and power system does not communicate with the CAN data bus is an internal problem caused.

replacement of the engine control unit, when the ignition switch ON EPC lamp lighting, look up the car with a password security code reading apparatus, connected VAS5052 failure diagnostic and engine control unit performs adaptive security system . Specific adaptive operation path is: into the self-diagnostic function to select an engine control unit to view the vehicle identification number VIN 17 and 14 are X-security identification code; into the menu to select the matching function 012, soft keyboard appears, type channel number 50, the screen appears “PIN?”, and the emergence of the soft keyboard. Original car enter 4-digit password, press OK Q, click to save, back into the original interface of the engine control unit, the original vehicle identification number VIN 17 and 14-bit identification code is copied immobilizer, the engine control unit and then complete the throttle J220 a matching control unit J338. Thus, the engine can not be started troubleshooting.

(Chenzhong Ze)

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