Diagnostic Mode 08 - Request Control of On-Board System, Test or Component

Diagnostic Modes

The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes , erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and OBDMIDs used within the modes to monitor the engine, and emission related component parameters.

The following table provides a link to all diagnostic modes that monitor all components and systems which influence the emission quality.

• Depending on scan tool and protocol used, the information displayed may be referred to by different names such as OBDMID (TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Monitor Identifier (OBDMID), or contain no name at all and be referenced by only a number.

Diagnostic Mode 08 - Request Control of On-Board System, Test or Component

Diagnostic Mode 08 is used to control the operation of an on-board system, test or component. A Mode 8 service can be used to turn on-board system ON or OFF, or to cycle an on-board system, test or component ON or OFF for a specific period of time. The service can also be used to request system status or to report test results.

Diagnostic Mode 08, TID $01

Diagnostic Mode 08, TID $01 is used to determine if the evaporative system may be leaking.

• If the accelerator pedal is depressed during the test, the test will be aborted.

Test requirements

• No DTCs stored in the DTC memory.

• Intake Air Temperature (IAT) maximum 60 °C.

• Coolant temperature 80 -110 °C.

• Throttle valve angle 12.0 - 16.0%.

Procedure

- Connect the scan tool.

- Start the engine and run at idle for at least 15 minutes.

- Select "Mode 8: Tank Leak Test".

- Select "OBDMID 01: Tank Leak Test".

- Check the specified value of the tank leak test at idle.

- The following will be displayed on the scan tool screen:





- Switch the ignition off.

If the specified value is obtained:

- Refer to "Diagnostic mode 03: Interrogating fault memory " to check for any DTC's that may be stored => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

- To repeat the tank test, switch the ignition off and start the engine again and let run for 15 minutes at idle.

- Switch the ignition off.

- End of diagnosis.