TROUBLE DIAGNOSIS
EC-127
C
D
E
F
G
H
I
J
K
L
M
A
EC
Generic Scan Tool (GST) Function
NBS001R9
DESCRIPTION
Generic Scan Tool (OBDII scan tool) complying with SAE J1978 has
8 different functions explained below.
ISO9141 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service man-
ual.
FUNCTION
PBIB0197E
SEF139P
Diagnostic test mode
Function
Service $01
READINESS TESTS
This diagnostic service gains access to current emission-related data values, including
analog inputs and outputs, digital inputs and outputs, and system status information.
Service $02
(FREEZE DATA)
This diagnostic service gains access to emission-related data value which were stored by
ECM during the freeze frame. For details, refer to
EC-53, "FREEZE FRAME DATA AND
1ST TRIP FREEZE FRAME DATA"
.
Service $03
DTCs
This diagnostic service gains access to emission-related power train trouble codes which
were stored by ECM.