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

CT
to the enhanced P2
CT
* timing parameter value and stores an ECU 
identification that the final response of this ECU is pending. When the ECU finally responds, the tester deletes 
the ECU identification in its internal list of pending ECU responses. At the point in time when the last ECU 
which requested an enhanced response timing finally starts its response message, the tester re-enables the 
normal P2
CT
reload value for its P2
CT
timer. Any subsequent response message (single frame or first frame of 
multi-frame response message) during an active enhanced response timing P2
CT
*forces the tester to restart its 
P2
CT
timer as defined for the general handling of P2
CT
using the currently active reload value. 
Request
SF-RC78
SF-RC78
USDT-FF
SF
SF-RC78
Start (150)
Restart (P2C*)
Restart (P2C*)
Restart (P2C*)
Restart (150)
SF
Restart (P2C*)
Restart (150)
Normal Timing
active
Enhanced Timing
activated
Normal Timing
re-activated
Normal Timing
Normal Timing
Enhanced Timing
USDT-FC
USDT-CF
USDT-FC
USDT-CF
ECU #1 Transmit
Tester Transmit
Tester NWL
ECU #2 Transmit
ECU #3 Transmit
150
0
P2
CT
P2
CT
150
0
P2
CT
P2CT*
0
P2
CT
P2CT*
0
P2
CT
P2CT*
0
P2
CT
P2CT*
0
P2