Check engine light with code.....help please!
02-07-2008, 04:33 PM
#1
Member
Posts like a V-Tak
Thread Starter
Join Date: Feb 2008
Location: INDIANAPOLIS, IN 46237
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Check engine light with code.....help please!
I have been having a checking engine light that was flashing sometimes and constantly on some times. Varied with how long I drove or how far. Today I changed the plugs, wires, and air filter. Did an interstate drive approx. 50 miles. Car ran smoother and check engine light never flashed, just stayed on from start up till end of drive. Dropped it off at a local mechanics shop and he stated the check engine light on was an injector circuit open on cylinder 3. Code history he gave me was DTC P0203. Any ideas on what this could be or how to repair. The mechanic did not charge me to run the scan and I have got the car at home now. Thanks for any help.
02-07-2008, 04:36 PM
#2
BANNED
Join Date: Mar 2004
Location: Purgatory
Posts: 0
Likes: 0
Received 0 Likes
on
0 Posts
did you check the wiring on the #3 injector?
that is the front and center one.
Originally Posted by Archon
The common cause for that (I assume code P0203) is the wiring or connection to the injector. It could be a bad injector, but it would have to be either open or shorted, not just stuck, in order to throw the code. I'd suggest some resistance or votage checks of the wiring and injectors. That'* easier to do as a start over pulling the fuel rail. Nothing out of the ordinary there, then swapping injectors would be the next step.
02-07-2008, 04:44 PM
#4
Member
Posts like a V-Tak
Thread Starter
Join Date: Feb 2008
Location: INDIANAPOLIS, IN 46237
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Wiring appears good, removed injector 3 harness, peeled back tape and everything appears good and normal. Any other suggestions? Also, while doing the spark plug and wire change I had the negative cable disconnected the whole time. Would that eliminate an old code?
02-07-2008, 06:05 PM
#5
Member
Posts like a V-Tak
Thread Starter
Join Date: Feb 2008
Location: INDIANAPOLIS, IN 46237
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Took it for another drive and now it is missing a bit. Codes now are P0300 random/multiple cylinder misfire detected and again the P0203 injector circuit open cylinder 3. Please someone help. Misfire is more noticeable during warm-up and once at normal op temp the mis is less noticeable but still there.
Could any of these be due to the bad sc coupler? I ordered a new coupler today. Just curious. Thanks for the help. Bryan
Could any of these be due to the bad sc coupler? I ordered a new coupler today. Just curious. Thanks for the help. Bryan
02-07-2008, 06:12 PM
#7
Senior Member
Posts like a 4 Banger
Join Date: May 2006
Location: East Central Illinois
Posts: 135
Likes: 0
Received 0 Likes
on
0 Posts
Check the pins on the connector. Make sure one of them didn't back out of the connector. Not sure if thats possible. If you wiggle the connector, does the cylinder start to run ? Having the negative cable off should have cleared the code. See if AutoZone will clear the code for you. Then see if it comes back.
02-08-2008, 10:26 AM
#10
Senior Member
Posts like a Turbo
Join Date: Nov 2004
Location: HIRAM, OHIO
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
open injector circuit
The code is telling you open injector on cyl 3. That means the PCM expects to see a certain resistance value on that circuit, and instead it sees infinity, or at least a spec way out of range. Check the resistance of that injector against another injector. If they are the same, then the problem is in the wiring somewhere. Trace it back, somewhere you'll find an open wire or some nice green cheese at a connector. Could be a bad PCM, but not likely. Subsequent codes that you are setting are because with that injecotr not squirting, you are not running right.. Fix that open #3, clear all codes, then verify the repair by seeing if other codes return. Mike
