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1992 Grand Caravan 3.3 High Idle Diagnostics help
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CarGuru > Chrysler > 1992 Grand Caravan 3.3 High Idle Diagnostics help 25 February 2005 07:20:27
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1992 Grand Caravan 3.3 High Idle Diagnostics help

Dybber 25 February 2005 04:50:45
 Hello,
On my 92 Grand Caravan 3.3 I have a high idle problem that
consistently trips the Code 25 (IAC circuitry). Here is what I have
checked
and replaced.
Idle Air Conntrol Motor
No known vacuum leaks or other gasket leaks
No other codes found
The code 25 immediately sets itself even after I disconnect the battery for
an extended period. I even disconnected the PCM and reconnected.
It will show the code before I ever start the vehicle again. It must
set itself
when key is in on position and checks voltage.
When I start the vehicle and backprobe the IAC connector(4 wires) with a
voltmeter I believe I should get a 'cycling voltage' from under 1 volt
to > 12 volts
on each wire. I get these voltages on all the wires except the
black/yellow one.
I traced the wire back through the harness and to the PCM and everything
looks OK.
Resistance tests appear normal. For those who know a ton more than me:
What would be your next steps if you were in my shoes? Thanks

Add comment
Dybber 25 February 2005 07:20:27 [ permanent link ]
 Hello,
On my 92 Grand Caravan 3.3 I have a high idle (2000 rpms in Park)
problem that
consistently trips the Code 25 (IAC circuitry). Here is what I have
checked
and replaced.
Idle Air Conntrol Motor
No known vacuum leaks or other gasket leaks
No other codes found
The code 25 immediately sets itself even after I disconnect the battery for
an extended period. I even disconnected the PCM and reconnected.
It will show the code before I ever start the vehicle again. It must
set itself
when key is in on position and checks voltage.
When I start the vehicle and backprobe the IAC connector(4 wires) with a
voltmeter I believe I should get a 'cycling voltage' from under 1 volt
to > 12 volts
on each wire. I get these voltages on all the wires except the
black/yellow one.
I traced the wire back through the harness and to the PCM and everything
looks OK.
Resistance tests appear normal. For those who know a ton more than me:
What would be your next steps if you were in my shoes? Thanks

Add comment
Comboverfish 25 February 2005 11:56:33 [ permanent link ]
 Please crosspost your message if you are going to send the same exact
question to two or more groups at the same time. See your thread in
rec.autos.tech for reply(s).

Toyota MDT in MO

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CarGuru > Chrysler > 1992 Grand Caravan 3.3 High Idle Diagnostics help 25 February 2005 07:20:27
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