Diagnostic Concept
Diagnostic Concept
General
The demands on the car's functionality have developed strongly during the last years. Development has primarily affected the car's electrical system. From Saab 900 1994 when the instrument bus with 4 control modules via Saab 9-5 and 9-3 with the Infotainment bus and the Power train bus and 13 control modules on to the Saab 9-3 Sport Saloon with at most 30 control modules.
In addition to the I-bus and the P-bus, an Optical bus was introduced on the Saab 9-3 Sport Saloon, which interconnects the car's infotainment system. Furthermore, an electrically controlled steering column lock was introduced. Initially it will be possible to SPS program 8 of the car's control modules. Most of the car's control modules have a flash memory and will be successively included in SPS. A new function in TIS 2000 allows you to access new SPS files via the Internet between CD releases.
Diagnostic tool
The software has been subdivided. For Saab 900 and 9000 (version 44.000 and later) a 10 Mbyte memory card is used. For 9-5, 9-3, 9-3 Sport Saloon and SPS (version 102.000) a 32 Mbyte memory card is required. The subdivision gives assured functionality for systems in older cars and less validation work with new releases. Both cards can sit in the diagnostic tool. You switch between cards by starting the diagnostic tool, waiting until the introduction screen is shown and then pressing:
- Shift
- Left arrow or right arrow
- Shift
For 9-3 Sport Saloon (9440), connect the P-bus and I-bus are directly connected to the data link connector, which requires use of an adapter (CANdi) for the diagnostic tool. The increased complexity of the car has increased the demands on the diagnostic tool. The diagnostic tool has therefore been adapted more directly to various user situations. When Tech2 is used for car models other than the 9-3 Sport Saloon and 9-5 prior to MY06, the CANdi box must not be used.
Diagnostic Strategy
The diagnostic strategy remains unchanged. You first read the diagnostic trouble codes from all the control modules and then perform fault diagnosis on the diagnostic trouble codes whose symptom description corresponds with the customer complaint. The difference in the diagnostic tool is that you now always read the diagnostic trouble codes from all control modules one at a time. You can then choose to transfer the diagnostic trouble codes to WIS via an RS 232 cable or enter them by hand. The diagnostic trouble codes now have two extra characters to point out the type of fault more accurately.
To easily find the activations or read values used in fault diagnosis for a specific trouble code you can select, "Diagnostic Data , trouble code" and then see directly just the values used in WIS fault diagnosis.
Fault diagnosis by symptom
Using fault diagnosis by symptom is more difficult to determine in advance which control module should be contacted to read values or activate. Accordingly the diagnostic tool has been divided into operations. You no longer contact a control module but an operation, that is a virtual control module. This means that with a fault on e.g. the left flashers you do not need to think about which control module is involved in the operation, you just select "Left flashers" from the menu. The diagnostic tool will then present the values and activations from all control modules involved in the left flashers operation. If you find something wrong, you can then see which control module the value came from and then perform fault diagnosis using, e.g. the wiring diagram.
During fault diagnosis on a specific operation using the diagnostic tool information about this can be found in WIS. In WIS there is an extra search window that uses the same navigation as on the diagnostic tool.
Adjustments
Adjustments, like activations and read values, can be found under respective operations. In addition, there is a list of the most common adjustments available under "All".
Add / Remove
When you program a key / remote control, change a control module or fit an electrical accessory, you need to access a new menu called "Add / Remove". The menu option marries and separates components in relation to the car. During "divorcing", critical data can be copied from a control module which is later loaded into the new control module. Remember that any SPS programming should be done before an "Add" operation. You must also retrieve "Security Access" for control modules included in the car's immobilization function. This is retrieved via RS 232 from TIS 2000 when the diagnostic tool requests it. You can also retrieve security access in advance and then kept it for the entire time you are working on the car in question, even if you disconnect the diagnostic tool now and again. Key programming and some activations that concern the central locking system and electric window lifts, for example, are also protected and require security access.
Bus
Bus configuration can be read and reset as before. An addition is that, besides "Missing" and "OK", "Added" is also shown if a unit has been fitted without resetting the bus list. Furthermore, "Not fitted" is shown for control modules that are not mounted and should not be mounted in the car. The bus list is divided into four pages, two for the I-bus, one for the P-bus and one for the O-bus.
With an "Add / Remove" of a control module updating of the list takes place automatically. In connection with the trouble code reading a check is made on the buses in accordance with the previous concept. Further tools have been introduced for fault diagnosis of the buses. A fault counter in each control module can be read and reset using the diagnostic tool. The counter's value increases with short term breaks to the control module in question.