General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

RequestOutOfRange 
A negative response with this response code shall be sent only if the request for this 
service was sent using the ECU Physical Request CAN Identifier (see paragraph 
4.4.1 for description of Physical Request CAN Identifier) and: 
1. None of the PID(s) being requested is supported in the ECU. 
2. All supported PID(s) being requested require security access and ECU security 
access has not been granted. 
If a request for this service is sent using the All Node Functional Request CANId 
(including a valid extended address) and either of the above conditions exist then 
there shall be no response sent. Reference the pseudo code in paragraph 8.6.6.2 for 
further clarification. 
M 
ROOR 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
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February 2010 
Page 110 of 336 
Hex Description 
Cvt Mnemonic 
78 
RequestCorrectlyReceived-ResponsePending 
This response code shall be sent if retrieving the data associated with the requested 
PID and transmitting the final response on the bus takes longer than P2
c
ms (e.g., the 
data to be read has to be retrieved from another processor via an ECU internal SPI 
bus). 
C 
RCR-RP 
8.6.5 Message Flow Example ReadDataByParameterIdentifier Service. 
This section specifies the 
conditions to be fulfilled for the example to perform a ReadDataByParameterIdentifier service. The tester may 
request PID data at any time independent of the status of the server (as long as another USDT response is not 
pending currently). 
8.6.5.1 Request OBD PID $0C - Engine RPM. 
In the example below (Table 85), the following is assumed 
true:
 

The point to point request CAN Id for the ECU is $7E0. 

The USDT response CAN Id of the ECU is $7E8. 

The PID for engine rpm (as defined in SAE J1979/ISO 15031-5) is $0C (so this service requests with 
$000C). The data returned is 2 bytes with a transfer function of rpm = N/4. 

Engine Speed is assumed to be 750 rpm at the time of the request.