<tsmith@usd252.org> wrote in message
news:b67274e9-2b0b-4961-825f-0f1da25d7a7f@s1g2000pra.googlegroups.com...
> I have a 2001 Dodge Grand Caravan Sport that gives me a p0202, which
> is injector
> circuit malfunction #2. It runs very rough.
> My question is this, can I disconnect the wiring from each injector
> to
> see if it changes the idle. If I find one that does not change the
> idle, and I test it with a noid light to make sure it getting the
> proper signals, does this mean the injector needs replaced?
>
> I also have other codes that come up P0122, P0123, and P1478. Any
> help would be greatly appreciated.
>
> Terry


The first thing to do is clear all the codes and start over, P0122 is a TPS
voltage low fault and the P0123 is a TPS high voltage code. This may have
been set if you disconnected something with the key on. As far as the p0202
code goes, there is no reason to disconnect each injector at a time. The
p0202 means it is the #2 injector circuit!!

Glenn Beasley
Chrysler Tech

In article
<0bfc434e-3045-44e5-9851-b7ca4359c7c5@d45g2000hsc.googlegroups.com>,
tsmith@usd252.org wrote:

> Thanks Glenn. I reset the codes started the van and it idled very
> rough. It even died, but it did restart. I turned it off and now the
> codes are as follows:
> P0202 Injector #2 control circuit
> P0122 Throttle Position Sensor Voltage Low
> P0106 Barometric Pressure Out of Range
> P1478 Battery Temp Sensor Volts Out of Limit
> What do I try now?

Diagnosing the 32 injector circuit.
Is there continuity on both wires between the PCM and the injector?
Is there 12 volts at the injector?
Is the PCM pulling the injector to ground?
Is the #2 injector's resistance in spec?

> I assume that the first code listed, the injector
> may cause the some of the other codes. Is this wrong?

Yes.
No relation between the #2 injector and the TPS.
No relation between the #2 injector and the MAP sensor.
No relation between the #2 injector and the battery temp sensor.

"aarcuda69062" <nonelson@sbcglobal.net> wrote in message
news:nonelson-F893FF.15065921082008@news.mil.sbcglobal.net...
> In article
> <0bfc434e-3045-44e5-9851-b7ca4359c7c5@d45g2000hsc.googlegroups.com>,
> tsmith@usd252.org wrote:
>
> > Thanks Glenn. I reset the codes started the van and it idled very
> > rough. It even died, but it did restart. I turned it off and now the
> > codes are as follows:
> > P0202 Injector #2 control circuit
> > P0122 Throttle Position Sensor Voltage Low
> > P0106 Barometric Pressure Out of Range
> > P1478 Battery Temp Sensor Volts Out of Limit
> > What do I try now?
>
> Diagnosing the 32 injector circuit.
> Is there continuity on both wires between the PCM and the injector?
> Is there 12 volts at the injector?
> Is the PCM pulling the injector to ground?
> Is the #2 injector's resistance in spec?
>
> > I assume that the first code listed, the injector
> > may cause the some of the other codes. Is this wrong?
>
> Yes.
> No relation between the #2 injector and the TPS.
> No relation between the #2 injector and the MAP sensor.
> No relation between the #2 injector and the battery temp sensor.

Is there more to this vehicle that you aren't saying> has the vehicle been
in an accident? fire or other kind of mishaps? The injector fault is easy to
test. make sure you have 12 volts at the injector as the vehicle is running
and make sure you get a ground signal on the other wire. if not trace them
back to the PCM.The same goes with the TPS fault. If you are getting a low
voltage fault you need to check for 5 volts at the TPS for proper voltage.
It could be shorted to ground or open. The TPS sensor could also be bad, the
sensor wire form the TPS could be shorted to ground. The Trans controller
could also cause this problem if the TP signal is shorted. This is the same
as the map sensor. Have you done something recently on this vehicle that may
have caused this problem because these faults do not appear to be related

<tsmith@usd252.org> wrote in message
news:1660c95b-91d6-4330-94ca-219c7083938b@e39g2000hsf.googlegroups.com...

< Have you done something recently on this vehicle that may
> have caused this problem because these faults do not appear to be related-
Hide quoted text -
>
> - Show quoted text -

The vehicle has not been in an accident, but I did change out a bad
altenator on it about 3 weeks ago. Thank for all the suggestions.
I'll try a few, but some seems a bit over my head.

Thanks Terry

Well if the problem happened after this repair was made you may want to go
back and check over your work for loose connections/pinched wires.
By any chance was this vehicle jump started with a backwards connection?

Glenn