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FUNCTION
NGEC0556S03
Diagnostic test mode Function
MODE 1 READINESS TESTS
This mode gains access to current emission-related data values, including analog
inputs and outputs, digital inputs and outputs, and system status information.
MODE 2 (FREEZE DATA)
This mode gains access to emission-related data value which were stored by ECM
during the freeze frame. [For details, refer to “Freeze Frame Data” (EC-679).]
MODE 3 DTCs
This mode gains access to emission-related power train trouble codes which were
stored by ECM.
MODE 4 CLEAR DIAG INFO
This mode can clear all emission-related diagnostic information. This includes:
쐌 Clear number of diagnostic trouble codes (MODE 1)
쐌 Clear diagnostic trouble codes (MODE 3)
쐌 Clear trouble code for freeze frame data (MODE 1)
쐌 Clear freeze frame data (MODE 2)
쐌 Reset status of system monitoring test (MODE 1)
쐌 Clear on board monitoring test results (MODE 6 and 7)
MODE 6 (ON BOARD TESTS)
This mode accesses the results of on board diagnostic monitoring tests of specific
components/systems that are not continuously monitored.
MODE 7 (ON BOARD TESTS)
This mode enables the off board test drive to obtain test results for emission-related
powertrain components/systems that are continuously monitored during normal driving
conditions.
MODE 8 —
This mode can close EVAP system in ignition switch “ON” position (Engine stopped).
When this mode is performed, the following parts can be opened or closed.
쐌 EVAP canister vent control valve open
쐌 Vacuum cut valve bypass valve closed
In the following conditions, this mode cannot function.
쐌 Low ambient temperature
쐌 Low battery voltage
쐌 Engine running
쐌 Ignition switch OFF
쐌 Low fuel temperature
쐌 Too much pressure is applied to EVAP system
MODE 9 CALIBRATION ID
This mode is to enable the off-board to request vehicle specific vehicle information
such as Vehicle Identification Number (VIN) and calibration IDs.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
VG33E
Generic Scan Tool (GST) (Cont’d)
EC-689
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
GI
MA
EM
LC
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