Tester Instructions ver 7
Contents
1. When the throttle arm is released the switch should click again This should be repeated several times to confirm consistent operation If the throttle plate arm has to be firmly pushed closed in order to hear the click on release then check that the other cables such as the cruise control and kick down cables are not preventing the throttle to close correctly Otherwise refer to the workshop manual for further checks on the throttle switch system Note that because the Actuator Drive Test may not run due to this problem it is not possible to use the tester to confirm the fault a After WORKING prompt the tester will proceed to the first check of the fuel injectors Code 1311 The injectors are cycled on an off on a continuous basis until stopped by pressing enter They are pulsed at a rate of approximately once a second and will be heard to gently click each time All 8 injectors are triggered simultaneously This enables checks to be made to determine if one injector is not operating and if not then the actuating voltage feed can also be checked Note that if the engine has been run immediately prior to this diagnosis the remaining residual pressure in the fuel rails will allow some fuel to be pumped into the cylinders during this test For prolonged fault finding using this feature it is recommended to delay at least one hour after last starting the engine b The injectors will be pulsed until the enter key is p2. Porsche Service Information booklet WKD 495 021 of 1989 A copy of this is provided on the CD ROM supplied with the tester Briefly it can display Engine temperature Coolant temperature Coolant level Outside temperature Fuel level including the calibration level Oil pressure Alternator voltage Function of all warning circuits switches If a fault has been signalled to the dash while driving it will log the elapsed time or distance travelled after the warning The precise tests available depends on the version of software that is fitted to the digital dash in the car under test This varies from model year to model year On some versions of digital dash this feature of the tester can also be used to change the displayed language of the digital dashboard This is enabled as follows select Digital Dash Diagnosis with the tester Pull the control level towards you for 3 seconds If the language change feature is available the LANGUAGE is displayed on the dashboard Pulling the lever repeatedly will scroll through the option available These are typically German D English US French F and Italian T When the ignition is switched off the last selected language is retained For MY 90 the language change is not retained if the battery is disconnected For MY 91 it is retained VIEWING DATA AND SOFTWARE UPDATES Viewing data with a laptop computer The RS232 connection at the base of t
3. the throttle arm is released the switch should click again This should be repeated several times to confirm consistent operation If the throttle plate arm has to be firmly pushed closed in order to hear the click on release then check that the other cables such as the cruise control and kick down cables are not preventing the throttle to close correctly Otherwise refer to the workshop manual for further checks on the throttle switch system This routine resets the idle stabilisation loop Code 1411 The engine is run for 45 seconds at idle speed and the ECU adapts its default setting for the correct idle speed 675rpm for automatic transmission cars manual S4 and manual GTS 775rpm for GT SE CS models This is routinely carried out by Porsche specialists when they have cars for serving or repair Idle speed is properly set and the car will generally run better generally as the LH system is adapted to the engine It is recommended that that is carried out at each annual service and also if any work is done on the engine inlet system components The prompt IDLE SPEED ADAPTATION PRESS ENTER START is shown Before pressing enter check the alarm immobiliser is disarmed then press enter The prompt START ENGINE WITHIN 8 SECONDS will be shown If the engine is not started the then the tester will return to the idle adaptation top menu If the engine is started then the tester will acknowledge this with ENGINE TURNING
4. Fort Selection Jump to Bootloader Command Line Complete Character Com 1 Is E Bootloader Active Character Page Error Character Baud Rate Selection E E C 13200 Start Download Sequence ootloader Ready hecksum Error Character g oo T n le Complete with Errors Character EPROM Write u le Complete Mo Errors Character x a i e Application Code fw C PorscheS Diagnostic testersottwaresverl 31 _AlWerl 31928 Browse EEPROM Code T Browse Wait for Bootloader then Download Status Idle Info Emit The tester will require to be powered up via the vehicle lead while updates are installed If a laptop is not available for this a d c power cable is available from JDSPorsche To install a software update connect the serial cable from the computer to the tester Start the Bootloader program from the desktop then check that Com port selection is set to COM 1 and the Baud rate selection to 19200 When the diagnostic tester is first powered up via the vehicle or power lead it will display XXXXXXXXXX on the display for the first 5 seconds During these 5 seconds click the tab Jump to Bootloader then Download If you have missed the 5 second window the tester will just start up in the normal way and no download will take place Start the sequence again and repeat If down load has started look at the status line is the Bootloader window
5. JDSPORSCHE DIAGNOSTIC TESTER USER MANUAL Introduction The JDS Porsche diagnostic tester is an enhanced flashing code tester for ECU fault code reading clearing fault codes idle adaptation and digital dash diagnosis on Porsche cars from 1987 1994 It provides the home mechanic or Independent Porsche Specialist a cost effective and invaluable tool to aid servicing and fault finding on Porsche cars Functions provided are Reading stored ECU fault codes giving a fast health check on the car s electronic systems Actuator tests allow the operator to energise various actuators in the car as required to assist with fault finding Clearing stored fault codes after the fault has been rectified Knock counts of detonation can be carried out while driving the car on the road or on a rolling road Reset the idle speed of some models Activates diagnosis of the digital dashboard used in later 928 models Diagnose and test 928 S4 GT SE CS and GTS 944S S2 and 944 Turbo all 964 models all 968 models It is a small hand held unit It is powered from the vehicle supply so there are no internal batteries It has a 40 character 2 line alpha numeric display This enables operating instructions menus and fault displays to be clearly shown without reference to written manuals The display has a back light for operation in difficult environments The operation is intuitive and easy to use with a single enter button for operat
6. Select Digital dash diagnosis a useful menu of fault diagnosis and monitoring a R The sequence repeats until a selection is made by pressing enter 1 LH EZK PSD ECU test If LH EZK PSD ECU test is selected then the display will make a request to switch on the ignition SWITCH ON IGNITION or if it has been left on in error to turn it off and re start the test The tester then requests that the enter button is pressed to start the diagnosis of the LH or DME ECU and then displays LH DIAGNOSIS READY PRESS ENTER TO START The green LED below the main LCD display panel will then start to flash as the tester establishes communication with the LH ECU and the display will show WORKING The LED is the equivalent of the Check engine lamp fitted to some cars The fault codes and other responses are indicated by sequences of flashes shown by the LED See Appendix 1 If there any stored fault codes in the ECUs they will be shown on the display with their fault code number and also a text description such as 02 SENSOR OVER_RICH MIXTURE 1123 or KNOCK SENSOR 2 REAR FAULTY 2132 The fault code number is the same as used in the fault finding section of the factory workshop manuals which give detailed fault analysis routines The tester will pause on each fault found until prompted to continue When all the faults on each ECU are completed there is the option to erase all the fault codes and
7. TS FOUND Fault codes and their meanings There are approximately 40 fault codes possible for the LH EZK and DME ECUs 15 fault codes for the PDS ABS system 50 fault codes for the Airbag system 26 fault codes for the 964 Heater system 30 fault codes for the 964 Tiptronic system The fault codes for LH EZK or DME have 4 figures the first figures identifies the ECU 1XXX is for LH EZK or DME ECU s 2XXX is for EZK ECU 3XXX is for the airbag ECU SXXX is for the PSD ABS ECU SXXX is for the Heater ECU 964 The second figures can either be a 1 or a 2 The former signifies that the fault is currently present the latter that the fault is not always present intermittent The third and fourth figures are the unique fault code identifier Examples TEMPERATURE SENSOR 2 OPEN CIRCUIT 1114 is a steady fault for the LH DME ECU KNOCK SENSOR 2 REAR FAULTY 2232 is an intermittent EZK fault Comparison with KTS 300 Hammer The KTS 300 communicates with the ECU s in a somewhat different manner But the only major function not provided by the JDSPorsche tester is the bleeding of the PDS system fitted to the later 928s and the PDAS system fitted to the 964 Carrera 4 cars Any stored PDS fault codes will be read out by the JDSPorsche tester PDAS fault codes TBD JDSPorsche will be producing a separate control box to enable the bleed function to be carried out quickly and safely The JDSPorsche tester will not diagnose the RDK sys
8. continue to the next ECU or to retain them and to proceed The displays TO CLEAR LH CODES PRESS ENTER NOW and TO RETAIN LH CODES PRESS ENTER NOW alternate until the required option is selected If there are no stored fault codes the tester will display LH DIAGNOSIS 1500 NO FAULTS FOUND alternating with PRESS ENTER TO CONTINUE TESTING After the first ECU has been diagnosed LH or DME according to model of vehicle the tester then will display LH OUTPUT END 1000 or DME OUTPUT END 1000 and then prompt the user to press the enter button to proceed The tester then will start to initialise and test the next ECU EZK 928 only PSD Tiptronic 964 only and Heater ECU 964 only The ECU s are checked in sequence it is not possible to skip to the next ECU without reading the fault memory of each ECU in turn When all the available ECU s fitted to the car have been read then the tester displays NO FURTHER ECU RESPONSES and returns to the top menu IMPORTANT NOTE The LH EZK PSD ECU tests will not function if there are any Airbag fault codes stored in the car s Airbag ECU Any such fault codes MUST be cleared before diagnosis of the LH EZK PSD ECUs is possible As mentioned in section 3 this tester can only clear MY90 USA airbag codes at present To clear Airbag codes on a MY91 onwards car will require the use of a KT S300 Hammer until an upgrade of software is available for thi
9. e tester will again respond with a 0000 display and text response if the test is satisfactory This completes the actuator test routine and the tester will return to the main menu 3 Airbag test The airbag ECU is read in a different manner by the tester so its diagnosis is selected from the top menu When prompted code 1311 will appear followed by airbag testing completed code 3500 if no faults are found Note that this option is functional for MY 90 US and Canadian market cars only at present Also please see the note at the end of section 1 requiring the clearing of Airbag fault codes before LH EZK PSD diagnosis is possible 4 Idle stabilisation adaptation The engine must be at normal operating temperature for this procedure The throttle switch must be closed for idle adaptation to take place Keep your foot away from the throttle during this sequence IMPORTANT NOTE Before MY 91 a fault code is not stored in the LH or EZK ECUs to advise that the throttle closed switch is open circuit it will report a permanently short circuit one From MY 91 the reported code is 1115 or 1215 If the Idle stabilisation routine will not run on a pre MY91 car check that the throttle is closing properly Listen in the engine bay and manually slowly open and release the throttle operating arm at the side of the inlet plenum As the throttle is slowly opened a faint click should be heard almost as soon as the throttle plate starts to move When
10. ector Plug this into the top of the tester The flat on the plug should be uppermost make sure that the plug is completely in its socket Start up As soon as the cable is plugged into the vehicle and the tester the tester is activated and the display is illuminated There is no on off switch As soon as the tester is powered up it will commence the initialisation and proceed automatically to the vehicle type selection menu The tester will scroll through the options on a 2 second cycle To select the car required press the green enter button on the side of the tester The tester will acknowledge the vehicle type that has been selected To terminate operation at any point or to return to the top menu unplug the tester lead When it is reconnected the tester will automatically reset itself and restart its sequence Note the number of vehicle types available varies according to the software version installed Make sure that the latest version is always installed DIAGNOSIS AND TESTING PROCEDURES The following options are then shown in sequence in the display Select LH EZK PSD ECU test for reading stored fault codes and cancelling fault codes Select Actuator drive tests for fault finding and fault correction Select Airbag ECU test reading fault codes and cancelling fault codes Select Idle stabilisation adaptation to reset the idle speed and optimise the LH ECU Select Knock counting tests for fault finding
11. followed by the display IDLE SPEED FOR 45 SECONDS followed by 1411 IDLE STABILISATION IN PROGRESS At the end of the 45 seconds the tester will show IDLE STABILSATION IS COMPLETE and then SWITCH OFF ENGINE 5 Knock counting tests The engine must be run at full load wide open throttle at high rpm for knock counting to be detected so the test can only be executed on a rolling road dynamometer This test monitors any engine detonations pinking or knocking from the engine while being driven over 10 000 cylinder firing cycles Any detonation or pre ignition as it is sometimes called can cause severe engine damage The tester monitors the knock count outputs from the ECU in the 10 000 period approximately 2 minutes at 3 000 rpm If the count is more than 50 knocks then detonation is taking place and must be corrected During the test the knock number display is continuously updated At the end of the test period the total number of counts is shown and displays Fault if the total count is greater than 50 x na P et oe oe a ee 5 W n ae i E aa a a S a E A e ae The test can be repeated readily with a single enter press 6 Digital dash diagnosis This is a very useful additional feature available cars with digital dashboards Normally a special link tool is required to enable this feature The JDS Porsche tester has this function built in It is fully described in the
12. he tester 1s provided to enable the use of a laptop computer for data viewing and control using the serial port of the laptop To install and enable this feature install the viewer program by running the installation file setup exe contained within the directory VB viewer V0_5 on the CD ROM provided with this tester w JDS Porsche Viewer Y0 05 iof x JDS Porsche Viewer Note this feature requires Windows 2000 or higher to be installed on the host laptop To make a shortcut on the desktop right click the mouse on a clear area of the desktop and select New shortcut then browse in the folder Program files to the folder Program 1 and select JDS_Porsche exe for the shortcut The on screen enter button can be activated with the mouse or the space bar With the serial cable connected the viewer display will follow the tester display The space bar acts as the enter button or a mouse can be used on the enter segment of the display Software updates To enable and install this feature run the installation file setup exe contained within the directory Bootloader on the CD ROM provided with this tester To make a shortcut on the desktop for this feature proceed as indicated above and select the the file AVR Bootloader exe for the shortcut faq AVR Bootloader 2 0 Biel Es File Default All Settings Info Connection Start Bootloader Characters Download File Characters Cor
13. ion of all functions through scrolling options and on screen prompts It is hoped the following instructions will help you quickly become acquainted with its operation CONNECTING THE TESTER Before connecting the tester to the car make sure that if your car is fitted with an immobiliser this must be disarmed before the ignition is switched on for any of the diagnostic or activating routines to function correctly Also check that the air conditioning switch is off Do not depress the throttle until requested to do so If the car has automatic transmission place the gear selector in Park Two types of connectors are available with the JDS Porsche tester 12 way connector For the 1988 Model year 928S4 and 944S a lead with a twelve way rectangular plug is required also for 1987 928 cars which have been upgraded by JDS Porsche for diagnostics The 12 way diagnostic socket on the 1987 8 928 cars is situated on the mounting plate that holds the LH and EZK ECU s under the cover at the side of the passenger s foot well For the 1988 944S the 12 way socket is under the dashboard on the passenger s side just above the DME ECU 19 way connector The 19 way socket on the 928 from MY 1989 to 1994 is located under the hump at the side of the passenger seat This cover is held with two thumbscrews For other Porsche cars refer to the workshop manual The other end of the cable is terminated in a 19 way mini DIN conn
14. lse is suppressed for this test But if some fuel was injected into the cylinders during check a above then the engine may run briefly When releasing the ignition switch from the cranking position do not switch off the ignition When the EZK pulse has been acknowledged by the ECU the LED is extinguished code 0000 this confirms the check was successful This is also verified by the LCD display text The absence of a EZK pulse suggests a faulty engine flywheel sensor or faulty EZK ECU f The sixth check is the throttle idle switch Code 1332 Press the throttle as prompted by the display and then release The ECU should respond with the 0000 code and corresponding text on the LCD display g The seventh check is for the wide open throttle switch WOT switch Code 1333 Open the throttle as prompted and then release The ECU should again respond with the 0000 output h i The eighth and ninth checks are for the air conditioning switched input to the ECU Code 1334 and 1335 The eighth check requests that the Air conditioning is switched on the LH ECU then checks that the voltage at the LH ECU terminal 15 is correct The ninth check is when the air conditioning is switch off that the signal at pin 14 of the LH ECU 1s correct j The tenth check is the auto transmission Park neutral switch to the ECU not cars with manual transmission Code 1336 When prompted move the gear lever from Park to D Th
15. ressed The tester then moves onto the second check of the idle stabiliser actuator valve Code 1321 It is repeatedly switched from one end of its range to the other An audible click will be heard about once a second If not an electrical can be carried out Note that the car may be slightly more difficult to start after this procedure some fuel may pumped into the cylinders by the injectors if there is residual fuel pressure as noted above If the car is reluctant to start after the diagnostic checks are completed hold the throttle fully open and crank the engine until it starts Proceed to the next check with the enter button c The third test is for the fuel tank venting valve to the carbon canister where fitted Code 1322 A faint click once a second should be heard d The fourth check is for the resonance flap on the inlet manifold so electrical and vacuum checks can be carried out Code 1323 A clear click should be heard about once a second Note the resonance flap is operated by a vacuum valve The valve is electrically triggered by the ECU If there is no residual vacuum in the system e g the car was not run in the last 1 2hour or it has a vacuum leak the click will not of course be heard e The fifth check is of the engine speed pulse into the ECU from the engine flywheel sensor Code 1331 The operator is prompted to crank the engine for 5 seconds The engine will not usually start because the fuel injector pu
16. s tester 2 Actuator drive tests This option allows the operator to check various actuators and switch inputs into the ECU s This is to assist fault finding Before starting these tests push the heater slider to the far left detent position Keep you foot away from the throttle switch To activate these tests check that the immobiliser is disarmed then select SELECT ACTUATOR DRIVE TEST in the top level menu The display prompt will then respond with the prompt ACTUATOR TESTS PRESS ENTER TO START The display SWITCH ON IGNITION WITHIN 8 SECONDS is then shown If you fail to switch on within 8 seconds the tester just reverts to the previous prompt IMPORTANT NOTE With some MY software the Actuator Drive Tests will not function if the throttle closed switch is not closing correctly Therefore keep the foot away from the throttle until instructed to do so as in test f below Before MY 91 a fault code is not stored in the LH or EZK ECUs to advise that the throttle closed switch is open circuit it will report a permanently short circuit one From MY 91 the reported code is 1115 or 1215 If the Actuator drive tests will not run on a pre MY91 car check that the throttle is closing properly Listen in the engine bay and manually slowly open and release the throttle operating arm at the side of the inlet plenum As the throttle is slowly opened a faint click should be heard almost as soon as the throttle plate starts to move
17. tem Issue 5 0 2004 JDSPorsche
18. where you should see the number of downloaded files counting down After about 2 minutes the bootloader will confirm that the download was successful The Tester will then automatically revert to normal operation As a last check check that the software version number displayed on start up of the tester is the correct one Note Do not try to run both JDSPorsche viewer and Bootloader programs at the same time CONTACT John Speake at info jdsporsche com for further information APPENDIX 1 TROUBLESHOOTING AND GENERAL INFORMATION Flash sequence It is not necessary to read these flashes as the diagnostic tester decodes and displays the code as well as a text explanation Therefore the following explanation is for interest only the flash sequence starts with a longer pulse which is a marker of approximately 2 5 seconds This is followed by groups of short approx 0 5 second pulses The time between the pulses in a group is 0 5 seconds and the time between groups is 2 5 sec Therefore in the example shown in the picture below code 1114 the sequence is 2 5 sec marker 2 5 sec gap 0 5sec pulse 2 5 sec gap 0 5sec pulse 2 5 sec gap 0 5sec pulse 2 5 sec gap then a group of 4 0 5 sec pulses with 0 5 sec gaps and then the sequence repeats with the 2 5sec marker A zero is not indicated so that the code 1500 LH ECU no faults found is sent as 1 5 to the tester The tester decodes this and displays it as LH DIAGNOSIS 1500 NO FAUL
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