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FUNCTION
NHEC0035S03
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-93).]
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:
I Clear number of diagnostic trouble codes (MODE 1)
I Clear diagnostic trouble codes (MODE 3)
I Clear trouble code for freeze frame data (MODE 1)
I Clear freeze frame data (MODE 2)
I Reset status of system monitoring test (MODE 1)
I 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.
I EVAP canister vent control valve open
I Vacuum cut valve bypass valve closed
In the following conditions, this mode cannot function.
I Low ambient temperature
I Low battery voltage
I Engine running
I Ignition switch “OFF”
I Low fuel temperature
I Too much pressure is applied to EVAP system
MODE 9 (CALIBRATION ID)
This mode enables the off-board test device to request specific vehicle information
such as Vehicle Identification Number (VIN) and Calibration IDs.
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Generic Scan Tool (GST) (Cont’d)
EC-104
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