GM 6.5L V8 EFI – DIAGNOSTICS – F4: MISC. TESTS

The Miscellaneous Tests mode is accessed by pressing F4 from the Main Menu. This mode is used to perform a variety of bi-directional checks.

After entering the Miscellaneous Tests mode, the following tests are available for the 6.5L EFI engine (figures 6-40 and 6-41)

– F0: Output Tests— Pressing F0 will display output test control modes that allow the Tech 1 to control PCM drivers through bi-directional communication. PCM out­ puts can be commanded “ON” and “OFF” to test their operation. In most cases, data parameters for the outputs can be displayed as they are being com­manded.

The following output tests can be run on 6.5L EFI vehicles (figures 6-42 and 6-43):
• F0: Inj. Pump
• F1: Glow Plug
• F2: Dash Lamps

– F2: Clear DTC— this commands the PCM to clear any stored Diagnostic Trouble Codes (DTC), both current and history.

– F3:RPM Control — allows control of engine speed.

– F5: Transmission — allows control of transmission solenoids.

– F7:OBDSysChk — performs the On-Board Diagnos­tic system check.

 

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