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External
Since: Dec 20, 2008
Posts: 2
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(Msg. 1) Posted: Sat Dec 20, 2008 3:53 pm
Post subject: 1997 C1500 4.3 has high idle and transmission not shifting
Archived from groups: alt>trucks>chevy (more info?)
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My truck had the MIL light come on and I had my neighbor run a scan.
The DTC were 0121 and 0122, which is related to the TPS.
I did a tune up new plugs, wires, TPS, IAC, MAP and cleaned the MAS.
Cleared the codes but still have the high idle and transmission not
shifting and the MIL code for the TPS 0121.
When the MIL came on the truck started running ruff and not wanting to
down shift from 3rd to 2nd or 1st. I could manually shift into 2nd but
the truck will not down shift into 1st. This is an automatic
transmission and would hesitate coming off the line. The tune up has
the engine running much smoother, but still has the MIL on for the
TPS. Further diagnose is pointing to the PCM, has anyone had any
experience with this? The next step we are looking at is using the
scanner to control the transmission on a road test. I would like any
opinions about next steps or solutions.
TIA,
Bubba |
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External
Since: Oct 30, 2007
Posts: 203
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(Msg. 2) Posted: Sat Dec 20, 2008 11:28 pm
Post subject: Re: 1997 C1500 4.3 has high idle and transmission not shifting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Johnny's Daddy wrote:
> My truck had the MIL light come on and I had my neighbor run a scan.
>
> The DTC were 0121 and 0122, which is related to the TPS.
>
> I did a tune up new plugs, wires, TPS, IAC, MAP and cleaned the MAS.
> Cleared the codes but still have the high idle and transmission not
> shifting and the MIL code for the TPS 0121.
>
> When the MIL came on the truck started running ruff and not wanting to
> down shift from 3rd to 2nd or 1st. I could manually shift into 2nd but
> the truck will not down shift into 1st. This is an automatic
> transmission and would hesitate coming off the line. The tune up has
> the engine running much smoother, but still has the MIL on for the
> TPS. Further diagnose is pointing to the PCM, has anyone had any
> experience with this? The next step we are looking at is using the
> scanner to control the transmission on a road test. I would like any
> opinions about next steps or solutions.
>
> TIA,
> Bubba
Run a check on the actual wiring and if your neighbors tool will read it
see what the TPS is actually showing for motion and voltage. Sounds like
either a ground problem or a bad connector.
--
Steve W.
Near Cooperstown, New York |
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External
Since: Dec 20, 2008
Posts: 2
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(Msg. 3) Posted: Sun Dec 21, 2008 1:38 pm
Post subject: Re: 1997 C1500 4.3 has high idle and transmission not shifting [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Sat, 20 Dec 2008 23:28:04 -0500, "Steve W."
wrote:
>Johnny's Daddy wrote:
>> My truck had the MIL light come on and I had my neighbor run a scan.
>>
>> The DTC were 0121 and 0122, which is related to the TPS.
>>
>> I did a tune up new plugs, wires, TPS, IAC, MAP and cleaned the MAS.
>> Cleared the codes but still have the high idle and transmission not
>> shifting and the MIL code for the TPS 0121.
>>
>> When the MIL came on the truck started running ruff and not wanting to
>> down shift from 3rd to 2nd or 1st. I could manually shift into 2nd but
>> the truck will not down shift into 1st. This is an automatic
>> transmission and would hesitate coming off the line. The tune up has
>> the engine running much smoother, but still has the MIL on for the
>> TPS. Further diagnose is pointing to the PCM, has anyone had any
>> experience with this? The next step we are looking at is using the
>> scanner to control the transmission on a road test. I would like any
>> opinions about next steps or solutions.
>>
>> TIA,
>> Bubba
>
>Run a check on the actual wiring and if your neighbors tool will read it
>see what the TPS is actually showing for motion and voltage. Sounds like
>either a ground problem or a bad connector.
Steve,
Went through the TPS, IAC and MAP diagnostics and the range and
voltage checkout fine.
We are going to check the temperature sender and the ground today,
have a friend that has a shop and will be taking to him if these do
not work. Going to try disconnecting the battery and see if the
computer will reset.
Thanks,
Bubba >> Stay informed about: 1997 C1500 4.3 has high idle and transmission not shifting |
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