Throttle Body Cleaning
Code P085This service procedure is necessary when a PCM Trouble Code P085 has set.
Remove or Disconnect
^ Air cleaner duct from the throttle body.
Inspect
^ Throttle body bore and throttle valve plate for deposits. It is necessary to open the throttle valve to inspect all surfaces.
Clean
The throttle bore and throttle valve plate deposits may be cleaned on the vehicle, using carburetor cleaner and a parts cleaning brush.
Caution:
Do Not use a cleaner that contains Methyl Ethyl Ketone. This solvent may damage fuel system components.
Cleaning Solvent
^ The throttle body parts may be cleaned following disassembly, in a cold immersion type cleaner such as GM X-55 or equivalent.
^ The Throttle Position Sensor (TPS) should not come in contact with solvent or cleaner, as electrical components may be damaged.
Install or Connect
1. Air cleaner duct at throttle body.
2. Enter diagnostics, select PCM override PS 13.
3. Press the 'Cooler' button on the Climate Control Panel.
4. Key 'OFF' for 30 seconds (do not exit diagnostics).
5. Perform Throttle Position (TP) SENSOR/IDLE LEARN procedure.