Страница 1 мировой engineering стандарты общая спецификация

Page 134
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110

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WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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Procedure 2: 
This procedure is to be performed twice, once while the ECU is secured (manufacturers enable
counter = $00, vulnerability flag < $FF, and security has not been accessed (SecurityAccess ($27) request has
not been sent)) and once when the ECU is unsecured ((manufacturers enable counter > $00 or vulnerability
flag = $FF), and security has been accessed (SecurityAccess ($27) request has been sent)).
1. Send a security access request message $01 with an incorrect number of data bytes and verify $7F $27
$12 response.
2. Send a security access request message $02 without sending a security access request message $01 and
verify $7F $27 $22.
3. Send a valid security access request message $01 and verify the security access positive response
message $01. Then send a request message $02 with an incorrect number of data bytes and verify the
$7F $27 $12 response (only perform this step when the seed response to the level $01 request is a non
zero seed).
Procedure 3: 
This procedure is to be performed while the ECU is unsecured ((manufacturers enable counter
> $00 or vulnerability flag = $FF), and security has been accessed (SecurityAccess ($27) request has been
sent)).
1. Send a valid security access request message $01 with the device already unsecured and verify $67 $01
$00 $00 response.
2. Repeat step 1 of this procedure and then send a security access request message with level $02. Verify
$7F $27 $22 response.
3. After performing steps 1 and 2 of this procedure, verify that the ECU remains unsecured by attempting a
secure service and verifying the correct positive response.