I have been fixing things on my 01 ITR over the past few weeks. One problem I have run into is that the car only runs and starts when there is an OBD2 code reader plugged into the OBD2 port. Otherwise it wot run/ coughs and dies. The lights are only half lit too. Anyone ever encounter this? It runs perfect with no CEL's or anything. I replaced the main relay. Strange? Ultimate theft deterant? You tell me.

 

try using an obd1 ecu p28 or p72

 

Do it.

 

aftermarket wiring? k line short on the DLC? more info please.

 

Stock wiring, stock car. I checked all the fuses and they are all fine. Everything works like normal.

 

Inspect and clean your grounds.

I had the exact same problem on my WS6 last week. The fuel pump would only prime and run with the EFILive connector plugged in. After checking over the fuses, the PCM tune, key chip, fuel pump relay and both circuits... I traced it to a loose ground on the driver's side head.

.610" lift cam at 6500rpm shakes everything loose lol

 

Checked'em, still nothing. But the fuel pump doesnt prime like you said, I figured it was the main relay but I changed that. Odd.

Its so hard finding clean late model F-bodys around here lol

 

check g101 on the tstat ground check continuity from them back to the pcm if they are good and the rest of the chasis grounds still nothing try a new pcm

 

Ok 2 more odd issues have popped up. Door ajar light remains dim, not on but dimly lit and the dome light isnt working. What fuse is the dome light?

 

Found the fuse. #43. Ill go check it.

Never mind. Problem unrelated.

 

have you not checked all your fuses? if you have not do so that is step 1 on electrical diag....

 

I did but this one blew for some reason after I swept the boxes. Everything works again.

 

My WS6 is in better condition than my ITR was, and it's going up for sale in the next couple of weeks. 410rwhp and triple the torque is a good thing

Anyway, my buddy hotwired the fuel pump at the relay under the hood. If it primes, then the pump and main circuit wiring to/from the pump are good and you can concentrate on the control circuit (85 and 86 terminals?) which includes the ECU and main relay. Double check this in the Helms.

If you're meticulous, you can also check voltage across 85-86 and 87-30 with and without the OBD connector plugged in. Mine had some very strange readings where the voltage differential was something like 8-9V because the grounds were spewing out +3V or so. That would be a strong indication of inadequate grounds. You may also consider throwsing down another grounding strap from the block to chassis (like the VC one)

At the end of the day, I'm convinced that anything connected to the OBD port is providing an additioanl ground path to the fuel pump circuits through the dash grounding points. If the current spike is large enough, it can fry your scanner and leave you stranded.

Take a look at this thread: http://www.honda-acura.net/forums/do...nding-kit.html

 

do you have any water leaks, or water residue in the car? check under the rear seat, check your fuel pump connectors and wires. I hada problem like this tin my GSR and it was from a small water leak near the fuel pump connector, corroded the connector, and it fried my computer... had to fix the wiring and order a new p72... if not check all of your grounds inside the cabin...

 

ECU

 

IIRC I think the battery grounded a wrench from the battery to a hold down post