Finally got the codes-any ideas?

Finally got around to having the codes read and below is the history. The symptoms I have been having are the sevice eng. light coming on for = =

awhile during a trip. Sometimes, not each time the light came on, the =

eng. would skip or misfire, I would get a whiff of raw gas briefly in th= e =

car. The sevice eng.light would go out and maybe not come on for anothe= r =

day or so. Gas mileage has suffered also. Below is the exact code as printed. Any help would be greatly appreciat= ed. TIA, MR

------------------------------------------------------------------------=

------------------------------------- Vehicle Scanned

1997 SL1 7=3D1 . 9L PFI

Set DTCs (codes)

History DTC P0203 Injector Circuit Open Cylinder 3 MIL NOT REQUESTED Since IGN PASS Since Clear P/F

History DTC P0303 Cylinder 3 Misfire Detected

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P0503 System Voltage Low

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P1599 Engine Stall Or Near Stall Detected

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P1624 PCM RAM Performance

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P0605 PCM Read Only Memory (ROM) Error MIL NOT REQUESTED Since IGN PASS Since Clear P/F

History DTC P0656 Fuel Level Output Circuit Malfunction MIL NOT REQUESTED Since IGN PASS Since Clear P/F

Reply to
mrichards
Loading thread data ...

Cylinder #3 Injector circuit open. Look for a open coil on the injector, a flaky connection or dammaged wire.Trace the connections all the way back to the ECU (which drives the injectors). could be intermittent which will drive you crazy. Many of the other codes may be related to one cylinder not working because of no fuel.

The other thing that stands out is low system voltage. check that your battery voltage is about 12V engine off and 13.8V engine running.

The ROM error and fuel circuit error may be related to low battery issues. (just a wild guess)

Oppie

------------------------------------------------------------------------------------------------------------- Vehicle Scanned

1997 SL1 7=1 . 9L PFI

Set DTCs (codes)

History DTC P0203 Injector Circuit Open Cylinder 3 MIL NOT REQUESTED Since IGN PASS Since Clear P/F

History DTC P0303 Cylinder 3 Misfire Detected

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P0503 System Voltage Low

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P1599 Engine Stall Or Near Stall Detected

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P1624 PCM RAM Performance

MIL NOT REQUESTED Since IGN NOT RUN Since Clear P/F

History DTC P0605 PCM Read Only Memory (ROM) Error MIL NOT REQUESTED Since IGN PASS Since Clear P/F

History DTC P0656 Fuel Level Output Circuit Malfunction MIL NOT REQUESTED Since IGN PASS Since Clear P/F

Reply to
Oppie

Snip Thanks a bunch for the info. The low voltage may have been due to a bad belt that I changed just before Christmas. The belt was starting to squeel and was hard and cracked when I replaced it. The gas mileage returned to near normal after replacing the belt which was a mystery, but now has dropped somewhat again. I will check out the connections as you suggested. I will also reset the codes. I think reset is done via pulling the neg. battery terminal? Thanks again, MR

Reply to
mrichards

Pulling the negative battery terminal will reset a lot of other things too, things you way not want set (like the theft-deterrent system on the stereo).

The proper way to reset the codes is with the same tool you use to read them. You can get that done for free at most major auto parts stores.

Reply to
Doug Miller

Thanks. I'll stop by and have them do that. MR

Reply to
mrichards

Simple ECU code reset on the L-series is by pulling the Controls B+ fuse for

10 seconds from the uhfp (Under hood fuse panel). Can't say if that will also work with any other model. Harbor freight has a very simple code reader that will also reset codes
formatting link
I'd prefer a scan tool that reads data streams but those are **much** more expensive. Still at the prices for the simple readers (About cost of a tank of gas), are within everybody's reach.

btw - if you are 'allergic' to repair shops, by all means obtain a shop manual for your vehicle or buy a subscription to

formatting link
Both are well worth the investment and even if you don't do your own repairs, gives you enough background to make informed choices.

Oppie

Reply to
Oppie

I checked the wires on no. 3 injector which the code pointed to and all = =

looked good from the top end. I noticed that the wires were resting on = =

top of a bolt that has sharp edges which is on the fuel rail. After =

removing the elect. plug from the injector and looking under the wires I= =

found a worn/burned spot in one of the wires and looked as if it had bee= n =

arcing. Taped the wires good and put some rtv on bolt head to smooth it= =

over. I guess that was what was causing the misfire and gas smell and perhaps = =

the drop in gas milage. Many thanks for the direction Oppie. Saved me a ton of time and money. I do have a set of manuals and use them for disassembly etc. mostly, but= =

have not helped me much on trouble shooting. Can't beat experience when= =

it comes to that. Many thanks again, MR

On Wed, 07 Feb 2007 11:49:21 -0500, Oppie wrote= :

Reply to
mrichards

Glad to help! I've done these sort of wire chaffing repairs in the past. I usually am a bit more thorough in that I either apply a shrink sleeve over the chaffed wires (requires cutting and splicing) or apply a good coating of RTV, let it dry for a few hours and then tape over. Degrease wires before using RTV or it won't stick. Tape has a way of coming off and letting in grunge that will rot the conductors. Granted that I'm a bit obsessive but I used to work on Military electonics. Would really mess with your day if some of that stuff went wrong.

Oppie

Reply to
Oppie

Right on the elec. connections. I have had a some real PIA elect. =

failures on travel trailer brakes. I used the shrink tubing and rtv on = =

those when I did a complete brake job. I would have done a little better job on the injector wires, but there w= as =

not very much wire length from wiring harness to plug on injector which = is =

what caused the worn spot in the first place. Also, no. 3 is a bitch of= =

an area to get to and could only work with my finger tips since my hands= =

are a little to large to get in that area without removing the throttle = =

cable. Many thanks again for your input. MR

On Wed, 07 Feb 2007 17:07:38 -0500, Oppie wrote= :

te:

Reply to
mrichards

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.