Heres a unique problem! Calling all z33 gurus! - Nissan 350Z Forum, Nissan 370Z Tech Forums
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post #1 of 9 (permalink) Old 05-08-2016, 10:48 PM Thread Starter
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Heres a unique problem! Calling all z33 gurus!

Welll heres a unique problem guys. So I have a turbo z running water meth. and a haltech. When I would drive the car hard i noticed that the cel light would come on but no change in driveability. I have a water meth injection kit setup for wot to activate. I went to leave walmart and the car fell flat on its face shortly after and drove like crap then stalled and died. I noticed that my water meth tank was empty and could hear the pump running. the switch had jammed out and dumped about a L of fluid in the intake. I disabled the water meth and I managed to get it started and running and it ran fine shortly after for about an hour. I parked it and came back to start it a couple hours later and the car starts in redline! bam bam bam bouncing the limiter. I shut it off and pop the hood and check all the connections i can see and go to start it and it starts and idles fine BUT no throttle input and cel light on. So i hook up my laptop to it and it says "no throttle input" and codes all related to tps and app voltage. I checked all the grounds and rewired them with a grounding kit including the dash grounds and ecu. The TB has 5v on the red/wht. the APP sensor didnt have power on one of the pinouts. I cleaned all the connections i could within the circut and then i got 5v to the app power pinouts. If i sweep the TB manually i see volage on the signal wires on the ecu connector, aswell with the APP sensor. All seems good? I thought i might have fixed it but no throttle response still. Now the car has no other codes but "u1100" failure to communicate with a class 2 serial device.
The previous owner had the vdc disable switch setup to the yaw sensor and it worked for a while then it just didnt work and the vds is permently disabled for some reason or the yaw sensor is broken. So my vdc and slip lights are always on. I think this is related to the CAN code but im not sure. Ive replaced the ecu with a factory one same code, new app sensor same code. and a new IPDM, P1228 codes are related to power and all sensors in the circut have their correct refrence voltage(app,pwr steering pres,ac pres,evap control) the also all have continuity to ground to the ecu pin.
Im making my way through the CAN circut diagnosis in the manual but its a long process. Should i just take it to nissan and they hook it to the consult?

I think my problem might be in the evap system as i dumped a bunch of water and meth in the intake maybe i fried somthing and shorted my evap system and thats why i got a WOT condition on startup? i have really no idea and need help! so thats where im at any ideas would be great as ive gone on idenafix and done almost everything related to this problem. ive put about 50 hours into this and am stumped almost.
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post #2 of 9 (permalink) Old 05-09-2016, 10:21 AM
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Welcome- and that's certainly a unique first post! While my background includes a lot of performance mods, I have not run any sort of water injection, so I can't provide any type of advice there. But it certainly sounds like you've fried or drowned something in the intake system. Your best bet might be finding a Nissan master tech willing to use a CONSULT III to diagnose the problem(s). Or, if the dealership refuses to work on such a modified vehicle, a Nissan performance specialist in your area. Where do you live?
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post #3 of 9 (permalink) Old 05-09-2016, 08:06 PM Thread Starter
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Welcome- and that's certainly a unique first post! While my background includes a lot of performance mods, I have not run any sort of water injection, so I can't provide any type of advice there. But it certainly sounds like you've fried or drowned something in the intake system. Your best bet might be finding a Nissan master tech willing to use a CONSULT III to diagnose the problem(s). Or, if the dealership refuses to work on such a modified vehicle, a Nissan performance specialist in your area. Where do you live?
Yeah that's what I'm prettymuch at now. I live in Vernon bc. The thing I'm confused about is that this u1100 code is in the CAN communication line and those sensors have nothing to do with the circuit that is linked to the tps and app and all the other sensors. So maybe I fixed the short since I have power at the app sensor now but somewhere along the lines I messed with something and screwed the CAN system up. From my understanding if you get a CAN code you get them like this "u1203" U1-meaning failure to communicate and 203 being the module that isn't checking in. The u1100 code means a general circuit failure meaning its shorted. maybe I'm wrong?
I also found corrosion in the connector of the CAN system in the IPDM (engine fuse box) so I replaced that but no change still. I suspect it might be the pins on that but I'm not sure. I cleaned them and they seem to be good.

Thanks

thanks for the reply

2003 Pearl 350z , Greddy 20g TT kit, greddy dual exhaust, Haltech, turbosmart bov, TB vortex spacer, 1/2" intake mani spacer, 6061 underdrive kit, AEm water meth, fatty oil cooler,PS cooler, Cutstom grill and aero, slammed on coils with full kinetix suspension package, 18x10 square setup , arp wheel studs, some gauges that are blue because racecar, 460ish hp 370Tq on 4.5 psi
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post #4 of 9 (permalink) Old 05-17-2016, 01:40 AM Thread Starter
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Took the car to Nissan they spent a few hours on it and said that tahey cant scan it because of the haltech. That was a waste f time.

I found out that I have power at both pins on my evap pressure control solenoid batt voltage on pin 1 and a few volts less on pin 2. This is suspect. Solenoid itself is good.

power to the evap canister vent valve. Valve is good, functioning perfect

No power to the back plug for the evap pressure vent control valve when key is on "on" position. Havnt tested sensor.

I'm confused as to why I cant read codes on the CAN network but I have the correct resistance on my obd2 plug. I get that"failure to communicate with a class 2 serial device." It will give me that code even if I unhook a module like the abs and not any secondary codes saying the abs module is unplugged. This makes me think their are wires shorting out and jamming the can serial communication.

Any ideas?

2003 Pearl 350z , Greddy 20g TT kit, greddy dual exhaust, Haltech, turbosmart bov, TB vortex spacer, 1/2" intake mani spacer, 6061 underdrive kit, AEm water meth, fatty oil cooler,PS cooler, Cutstom grill and aero, slammed on coils with full kinetix suspension package, 18x10 square setup , arp wheel studs, some gauges that are blue because racecar, 460ish hp 370Tq on 4.5 psi
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post #5 of 9 (permalink) Old 05-17-2016, 08:53 PM
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Sorry to hear the CONSULT III unit couldn't scan the system while using the Haltech. That's something I never knew! I hope the dealership didn't charge you for hours of diagnostic time if they couldn't do anything.

As for the CAN troubleshooting issues, I can't advise you there, except to say each component must be accounted for by the ECM to prevent a CEL being illuminated. My Z racecar has several codes that constantly pop up, but most are due to components removed (NATS, steering lock, a/c, etc) that won't ever be resolved. And SCCA racing rules won't allow me to modify my HR equipped Z as much as your is. Good luck and let us know if you ever find a resolution.
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post #6 of 9 (permalink) Old 05-18-2016, 02:02 PM Thread Starter
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Sorry to hear the CONSULT III unit couldn't scan the system while using the Haltech. That's something I never knew! I hope the dealership didn't charge you for hours of diagnostic time if they couldn't do anything.

As for the CAN troubleshooting issues, I can't advise you there, except to say each component must be accounted for by the ECM to prevent a CEL being illuminated. My Z racecar has several codes that constantly pop up, but most are due to components removed (NATS, steering lock, a/c, etc) that won't ever be resolved. And SCCA racing rules won't allow me to modify my HR equipped Z as much as your is. Good luck and let us know if you ever find a resolution.
I do believe that even if the car had a bunch of sensors unplugged in the CAN network the car would still be able to run and drive. This is why I have been having such a hard time. The no throttle input problem is separate from the CAN problem. I'm just down to tracing continuity in my evap system. The fact that I have power on both pins in my evap pressure control solenoid and that isn't right so I'm tracking that down

2003 Pearl 350z , Greddy 20g TT kit, greddy dual exhaust, Haltech, turbosmart bov, TB vortex spacer, 1/2" intake mani spacer, 6061 underdrive kit, AEm water meth, fatty oil cooler,PS cooler, Cutstom grill and aero, slammed on coils with full kinetix suspension package, 18x10 square setup , arp wheel studs, some gauges that are blue because racecar, 460ish hp 370Tq on 4.5 psi
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post #7 of 9 (permalink) Old 05-30-2016, 07:52 PM
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I have quite a bit of experience diagnosing CAN circuit issues in the diesel world. I'll try to give you my best advice. First I think u may have shorted the electronic throttle filling it with water/meth. I would try to replace the throttle body first. If that shorted it could have shorted the circuits in the ecu and this is causing your current problem. It may have shorted the factory ecu u plugged in duplicating the same problem with both ECU's. Also you should be able to check each circuit with a paper clip or jumper wire. With 3 wire circuits you should be able to jump them 2 at a time and u should get 3 different codes to rule out a possible wiring issue. Should get circuit open, circuit voltage high, and circuit voltage low. Personally I would start there with the no throttle response and the random high rpm start up. If that doesn't work I'd be more than glad to help diagnose this problem I like a good challenge haha.
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post #8 of 9 (permalink) Old 05-30-2016, 07:55 PM
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Also the only way to fry a ground circuit is with a shorted component. So I would send the ecu to Haltech and see if any circuits are fried.
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post #9 of 9 (permalink) Old 08-29-2016, 02:30 PM Thread Starter
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Also the only way to fry a ground circuit is with a shorted component. So I would send the ecu to Haltech and see if any circuits are fried.

So to update ...my car runs now! it was the haltech. It appears that the corrosion in my engine bay fuse box (ipdm) shorted the circuit and the killed the throttle control module on the haltech.

I have my car back which is nice Thankyou for the help!

2003 Pearl 350z , Greddy 20g TT kit, greddy dual exhaust, Haltech, turbosmart bov, TB vortex spacer, 1/2" intake mani spacer, 6061 underdrive kit, AEm water meth, fatty oil cooler,PS cooler, Cutstom grill and aero, slammed on coils with full kinetix suspension package, 18x10 square setup , arp wheel studs, some gauges that are blue because racecar, 460ish hp 370Tq on 4.5 psi
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