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Page 110
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
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.

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•
Engine Speed is assumed to be 750 rpm at the time of the request.
Table 85: ReadDataByParameterIdentifier (PID=000C hex)
T = Frame Sent By Tester; N = Frame Sent By Node; shaded region indicates PCI
Frame Type CAN Id
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