Scan Tool - OBD Memory Cassette
GROUP28
NO.
80
DATE
2/93
On-Board Diagnostic System (OBD System) Memory Cassette
850
REFERENCE: NONE
OBD SYSTEM MEMORY CASSETTE FOR VOLVO SCAN TOOL (VST)
A new memory cassette which permits serial display of Diagnostic Trouble Codes (DTCs) directly from the On-Board Diagnostic System (OBD System) has been developed for North America.
P/Ns: 9511337-9 (English version) and 9511338-7 (French version).
This bulletin provides a general description of the function and use of the new cassette when fault tracing with the VST.
Note:
For further fault-tracing and correction instructions when the OBD System reports a DTC, refer to the appropriate service manual.
Since the control modules for the various systems are designed for manual retrieval of flashing codes, the reporting sequences for each code are relatively long.
However, most of the modules are designed to operate at ten times the normal transmission rate when using the VST.
The program will select a high transmission rate, if available. Activation of a high transmission rate takes approx. 25 seconds. However, only a few seconds are then required to perform other operations. Systems operating at a low rate, on the other hand, can be activated more quickly, but require about 20 seconds for each operation.
Acronyms/Definitions
The ignition must be switched on during all tests, with the engine stopped in most cases.
In the case of power seats, special procedures are required to start the diagnostic system, depending on the particular model.
The seat cannot be operated manually while the diagnostic system is activated. On conclusion of testing, up to a minute may be required before the seat can again be operated manually. 850: See SB 85-805.
Key functions:
ENTER
Activates selected function and/or displays next menu.
EXIT
Interrupts a function and displays previous menu.
YES/NO
Used to respond to prompts.
Arrow keys
The arrow keys are used to move the flashing cursor within the menu, and for scrolling text up or down when the full text is too long for display in the window.
HELP
Provides information regarding key functions relating to the menu for which help has been requested.
Display window
A flashing indicator is displayed in the upper right. hand corner of the window when the system is operating.
The acronyms used in the display texts are explained in the table above.
Text indicating that the user must select or activate a function is shown in capitals.
Text of an informational nature is written in lower case.
Connection of VST:
- Switch off ignition.
- Insert program cassette.
- Connect adapter lead p/n 9511340-3 to tester and to diagnostic unit A or B, as appropriate.
- Connect power supply lead to battery. Attach red cable clip to positive terminal.
- Switch on supply to tester using switch on adapter lead box.
- Switch ignition on.
Diagnostic Unit Connections
PROM Data Check
Mode 1 - Display DTC's
Mode 2 - Testing Input Signals - System Sensors
Mode 3 - Cyclic Activation of Components
Mode 4 - Individual Activation of Components
Mode 5 - Displays Control Module Data
Mode 6 - Enters Data in Control Module
The illustrated operation numbers may only be added to claim in conjunction with a warrantable repair within the respective areas.
All operation numbers cover connecting the Volvo Scan Tool with the diagnostic key and performing a code readout.