That's correct: If the voltages fluctuate but you have this code as active,
it's a bad injector. You're basically verifying PCM operation. If they
don't fluctuate, it's (more than likely) a bad PCM.
- Bernd
-----Original Message-----
From: Jamie Calder [mailto:jcalder3@cfl.rr.com]
Sent: Monday, February 12, 2007 11:19 AM
To: dakota-truck@dakota-truck.net
Subject: DML: RE: Variable RPMs
Hi Bernd,
Can you please clarify. You're first statement said, "if it fluctuates
replace the injector".
The last post said, "Should fluctuate in the 12V range".
Thanks!
James
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bernd D.
Ratsch
Sent: Monday, February 12, 2007 11:57 AM
To: dakota-truck@dakota-truck.net
Subject: DML: RE: Re: RE: Variable RPMs
Should fluctuate in the 12V range. You can't give it an exact number due to
the pulsewidth.
One correction: Voltmeter should be connector to the POSITIVE side and the
negative to the injector driver (brain fart - injectors are controlled by
low-side drivers in the PCM).
- Bernd
-----Original Message-----
From: jim nelson [mailto:JAMESNELSON@LBINDUSTRIALSYSTEMS.COM]
Sent: Monday, February 12, 2007 10:42 AM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Re: RE: Variable RPMs
Thanks Bernd. I check that this evening. What should the voltage be at the
injector?
By the way glad to see you back.
Jim Nelson
""Bernd D. Ratsch"" <bernd@dodgetrucks.org> wrote in message
news:FLEBLMGMFEJAHIGMOFLNMEIICAAA.bernd@dodgetrucks.org...
>
> Nope...those are Injector #2 and #8 failure codes. Check the harness
> on the passenger side of the engine (rear of the head) for a pinched
> or chaffed wiring harness (seen that a few times). Also, check the
> voltages of those two injectors with a DVOM. Put one terminal to
> ground (from the meter) and the other to the driver side of the
> injector (at the connector - backprobe it with a paperclip if you
> can). Start the engine and watch the voltage - if it fluctuates
> replace the injector...if it doesn't - time to check the wiring to the
> PCM or possibly replace the PCM.
>
> With the TPS issue, you can easily check it with an analog voltmeter.
> Connect the meter to the TPS signal wire and the other to ground and
> watch the sweep of the needle. If it's smooth, no problem with the
> TPS. Don't bother checking the TPS with a DVOM as they don't properly
> show the sweep at all (not even recommended by DC to use a DVOM on
> that).
>
> - Bernd
>
> -----Original Message-----
> From: jim nelson [mailto:JAMESNELSON@LBINDUSTRIALSYSTEMS.COM]
> Sent: Monday, February 12, 2007 10:16 AM
> To: dakota-truck-moderator@bent.twistedbits.net
> Subject: DML: Variable RPMs
>
>
>
> On the way back from the coast this weekend my check engine light came on.
> RPMs started flucuating, like it was dropping in and out of over drive.
> Made it home and scanned it had P0202 and P0208, injector malfuntion.
> Have
> done some research on the web and have come up with replacing the TPS.
> This
> sound right?
>
> Jim Nelson
> '00 QC 4.7 98,000 miles
>
>
>
>
This archive was generated by hypermail 2b29 : Thu Mar 01 2007 - 00:44:23 EST