Throttle Reset procedure
08-12-2014, 07:23 PM
#1
Burning Brakes
Thread Starter
Throttle Reset procedure
Does anyone here know the procedure for a Throttle Reset on a 991.
On the 997 the steps are as follows;
Turn ignition to on (not start) for 60 seconds then off for 5 seconds then back on for 15 seconds and then back off.
During process you should not turn the switch to position 2 (start engine).
After the last 15 second step key is returned to position off
Here are the starter switch position steps. On - off - on - off.
Looking for the similar process for the 991 (or is it the same?).
Thanks in advance.
PS. It's supposed to reset throttle-by-wire mapping so throttle response becomes sharper, as this can become sluggish with time.
On the 997 the steps are as follows;
Turn ignition to on (not start) for 60 seconds then off for 5 seconds then back on for 15 seconds and then back off.
During process you should not turn the switch to position 2 (start engine).
After the last 15 second step key is returned to position off
Here are the starter switch position steps. On - off - on - off.
Looking for the similar process for the 991 (or is it the same?).
Thanks in advance.
PS. It's supposed to reset throttle-by-wire mapping so throttle response becomes sharper, as this can become sluggish with time.
Last edited by duxsi; 08-12-2014 at 08:00 PM. Reason: typo
08-12-2014, 07:51 PM
#3
Rennlist Member
08-12-2014, 08:03 PM
#5
Burning Brakes
Thread Starter
08-12-2014, 10:56 PM
#6
Rennlist Member
08-12-2014, 10:58 PM
#7
RL Community Team
Rennlist Member
Rennlist Member
Trending Topics
08-13-2014, 12:50 AM
#10
Burning Brakes
Thread Starter
08-13-2014, 01:27 AM
#11
This reset procedure seems so simple it could be done accidentally. So how does one know if it actually does anything? Is it reprograming the info that is reported by the key about the drivers habits.
Last edited by wanderfalke; 08-13-2014 at 09:55 AM.
06-02-2018, 09:43 PM
#12
RL Community Team
Rennlist Member
Rennlist Member
FYI, this procedure did NOT work for my 997.2. I did get it to work accidentally... not sure it will work for a 991... check it out here: https://rennlist.com/forums/997-foru...l#post15051716
Peace
Bruce in Philly
Peace
Bruce in Philly
05-18-2021, 11:21 PM
#14
RL Community Team
Rennlist Member
Rennlist Member
Gods I love song-and-dance threads where people clearly have no clue what's actually going on. Reminds me of the "PDK Reset" procedure.
@askhangura replacing the throttle body is, actually, one of the actual reasons for doing this! Ignore OP's "it gets sluggish over time" commentary.
tl;dr of below: make sure it's between 55 and 80 degrees Fahrenheit outside, turn on the ignition but not the engine and don't touch anything for 30 seconds. Turn off ignition. You're done.
Per the FSM though, here you go:
OVERWRITING ADAPTATION VALUES (WITHOUT DELETION) > THROTTLE VALVE
Necessary after:
Re-programming DME control unit
Replacing DME control unit
Replacing throttle valve
Information
Consequences of Tester adaptation if conditions for automatic adaptation are not met (violated boundary condition):
- For a fault entry in the load detection range (P0068 + P1069... P1077), the limits are extended in order to prevent incorrect detections.
- This extension is cancelled if an adaptation is performed when the conditions for automatic adaptation are met, or after 15 warm-up cycles at the latest.
- (Warm-up cycle = coolant temperature increases by more than 23 °C after start-up and reaches at least 73 ° C)
- Following manual throttle valve adaptation when ambient conditions are not met, throttle valve adaptation is carried out again automatically as soon as the ambient conditions are met.
- There is NO 30-second waiting time here, but a slightly delayed engine start is possible once.
The ambient conditions for automatic adaptation are as follows:
- Engine off and ignition on for > 30 seconds
- Accelerator pedal not pressed
- Vehicle is stationary
- Power supply for throttle valve adjusting unit is OK
- Coolant temperature 5 °C... 100 °C
- Intake air temperature 5 °C... 30 °C
How?
@askhangura replacing the throttle body is, actually, one of the actual reasons for doing this! Ignore OP's "it gets sluggish over time" commentary.
tl;dr of below: make sure it's between 55 and 80 degrees Fahrenheit outside, turn on the ignition but not the engine and don't touch anything for 30 seconds. Turn off ignition. You're done.
Per the FSM though, here you go:
OVERWRITING ADAPTATION VALUES (WITHOUT DELETION) > THROTTLE VALVE
Necessary after:
Re-programming DME control unit
Replacing DME control unit
Replacing throttle valve
Information
Consequences of Tester adaptation if conditions for automatic adaptation are not met (violated boundary condition):
- For a fault entry in the load detection range (P0068 + P1069... P1077), the limits are extended in order to prevent incorrect detections.
- This extension is cancelled if an adaptation is performed when the conditions for automatic adaptation are met, or after 15 warm-up cycles at the latest.
- (Warm-up cycle = coolant temperature increases by more than 23 °C after start-up and reaches at least 73 ° C)
- Following manual throttle valve adaptation when ambient conditions are not met, throttle valve adaptation is carried out again automatically as soon as the ambient conditions are met.
- There is NO 30-second waiting time here, but a slightly delayed engine start is possible once.
The ambient conditions for automatic adaptation are as follows:
- Engine off and ignition on for > 30 seconds
- Accelerator pedal not pressed
- Vehicle is stationary
- Power supply for throttle valve adjusting unit is OK
- Coolant temperature 5 °C... 100 °C
- Intake air temperature 5 °C... 30 °C
How?
Ignition on > 30 seconds if preconditions are met.
or
PIWIS Tester:
- Meet preconditions:
-- Engine off.
-- Ignition on.
- Select menu:
-- DME
-- Maintenance/repairs
-- Adaptations
-- Throttle valve adaptation
- Start function by pressing [F12].
-- Information
- Press [F12] for detail view.
- Meet preconditions:
-- Engine off.
-- Ignition on.
- Select menu:
-- DME
-- Maintenance/repairs
-- Adaptations
-- Throttle valve adaptation
- Start function by pressing [F12].
-- Information
- Press [F12] for detail view.
Information
- Adaptation values are deleted or stored in EEPROM when ignition is switched off after control unit run-on has ended.
This depends on the run-on period of the engine compartment purge fan.
The run-on period of the engine compartment purge fan AFTER ignition is switched off depends on the engine compartment temperature.
The run-on period is as follows at the following engine compartment temperatures:
- < 45 °C: approx. 50 seconds
- 45... 70 °C: approx. 200 seconds
- > 70 °C: up to 20 minutes
- Adaptation values are deleted or stored in EEPROM when ignition is switched off after control unit run-on has ended.
This depends on the run-on period of the engine compartment purge fan.
The run-on period of the engine compartment purge fan AFTER ignition is switched off depends on the engine compartment temperature.
The run-on period is as follows at the following engine compartment temperatures:
- < 45 °C: approx. 50 seconds
- 45... 70 °C: approx. 200 seconds
- > 70 °C: up to 20 minutes
- Switch off ignition
The following 6 users liked this post by asellus:
askhangura (05-19-2021),
bms0918 (10-13-2021),
DR911s (04-19-2024),
fluguy (05-20-2021),
john45in (05-19-2021),
and 1 others liked this post.
05-19-2021, 11:44 AM
#15
Burning Brakes
Thread Starter
The operative word in this thread from almost 7 years ago is "supposed to". "Supposed to" is neither gospel nor fact.
This claim came from a technical advisor from the largest Porsche dealer in the US (with skepticism) after they reset the DME and ultimately replaced the throttle-body.
Hence the question (not commentary) was posted here.
Thanks for the cut n' paste to help us mere mortals..
This claim came from a technical advisor from the largest Porsche dealer in the US (with skepticism) after they reset the DME and ultimately replaced the throttle-body.
Hence the question (not commentary) was posted here.
Thanks for the cut n' paste to help us mere mortals..