DESCRIPTION

Generic Scan Tool (OBD II scan tool) complying with SAE J1978 has 8 different functions explained below.

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ISO9141 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service manual.
 
 FUNCTION

Diagnostic Service
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 that were stored by ECM during the freeze frame. For details, refer to DTC Index.
Service $03
DTCs
This diagnostic service gains access to emission-related power train trouble codes which were stored by ECM.
Service $04
CLEAR DIAG INFO
This diagnostic service can clear all emission-related diagnostic information. This includes:
  • Clear number of diagnostic trouble codes (Service $01)
  • Clear diagnostic trouble codes (Service $03)
  • Clear trouble code for freeze frame data (Service $01)
  • Clear freeze frame data (Service $02)
  • Reset status of system monitoring test (Service $01)
  • Clear on board monitoring test results (Service $06 and $07)
Service $06
(ON BOARD TESTS)
This diagnostic service accesses the results of on board diagnostic monitoring tests of specific components/systems that are not continuously monitored.
Service $07
(ON BOARD TESTS)
This diagnostic service enables the off board test drive to obtain test results for emission-related powertrain components/systems that are continuously monitored during normal driving conditions.
Service $08

This diagnostic service can close EVAP system in ignition switch ON position (Engine stopped). When this diagnostic service is performed, EVAP canister vent control valve can be closed.
In the following conditions, this diagnostic service cannot function.
  • Low ambient temperature
  • Low battery voltage
  • Engine running
  • Ignition switch OFF
  • Low fuel temperature
  • Too much pressure is applied to EVAP system
Service $09
(CALIBRATION ID)
This diagnostic service enables the off-board test device to request specific vehicle information such as Vehicle Identification Number (VIN) and Calibration IDs.

 
 INSPECTION PROCEDURE

    1.Turn ignition switch OFF.
    2.Connect “GST” to data link connector (1), which is located under LH dash panel near the hood opener handle.
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    3.Turn ignition switch ON.
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    4.Enter the program according to instruction on the screen or in the operation manual.(*: Regarding GST screens in this section, sample screens are shown.)
    5.Perform each diagnostic mode according to each service procedure.
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    For further information, see the GST Operation Manual of the tool maker.