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2004 350z track coupe
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Discussion Starter · #1 ·
I have '04 nissan 350z m/t track model. the car had a 50k jdm VQ35DE motor swap at 136k miles, test pipes installed and tuned prior to purchasing car. After purchase I replaced an aftermarket steering wheel with factory one as i wanted my son to have a working airbag, then got multiple lights on dash, VDC, SLIP, SRS and codes p2138, p1612, p1212, C1136, U1000, U1001. Replaced clock spring and did steering angle reset, all codes lights cleared, happy times, car drove great for 1.5months. Then driving driving down the road, vdc, slip and cel come on, car goes into limp mode. pulled over, reset codes and car drives fine for another few days then same thing happens. Codes were p2138, p1212, C1131, U1001. Cleared codes again and restart the p2138 cleared but C1131 and U1001 remained almost constant after resetting. With all the communication errors we (this is my sons car) decided to clean connectors (proper electrical cleaner for sensitive electronics)etc. We had noticed that the previous owner that did the motor swap / tune, removed the 2 catalytic converter O2 sensors when he installed the test pipes and left the connectors dangling. We cleaned crankshaft sensor connector, the 2 dangling O2 sensors (covered / sealed them) and all ABS connectors. Tried to restart and check car........... car now has NO SPARK. We retraced our steps to ensure that everything was plugged in and secured to no avail. I had vehicle towed to local Nissan dealer for diagnosis and repair. Their report says, they reprogrammed keys to eliminate any NATS issue, coil packs have 122vdc when key is on, ECU reports "start" signal, injector pulse and fuel is present, crank sensor reports RPM and DTC present when it's unplugged, no open shorts to power or ground found. Dealer suggests trying alternate ECU as internal failure (undetectable) may have occurred as next troubleshooting step. They were unable to identify no spark problem and could not find problem or effect repairs.
I have read numerous forums and threads online of somewhat similar problems but all slightly different than this. I have since checked for and to confirm that there is NO SPARK on cylinder #3, 5 and 2.....picked these as they are easy to get to but both ignition wiring harnesses have no spark. I have replaced the crank sensor with aftermarket and tried unplugging it which makes no difference, still won't start. There is definitely fuel present, spark plugs are wet and you can smell gas after cranking.
My MaxiAP200 scanner shows NO codes at this time. I can see live data when attempting to start. I see "rpm" value near 220rpm. It shows the ECU start signal is "on". I have ordered new OEM crank and camshaft sensors and am considering having the ECU tested but apart from that I'm completely stumped as to why there's no spark.
any help or ideas would be greatly appreciated.
 

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That's an awful lot of problems in a relatively short time. I suspect you may have some problems with the main wiring harness itself. Did you change the harness when you swapped the engine? Have you checked the electrical output of the harness at the coil side of the three plugs that aren't firing?
 

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2004 350z track coupe
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Discussion Starter · #3 ·
Thanks. I did check the #3 & #4 connectors and have 12.25 v, I'm not sure how to check the signal wire to see if that is actually receiving signal from the ecm? Is there troubleshooting value in checking ALL spark plug positions for spark and corresponding voltage ? I've thought about replacing the harness but there seem to be very few of those around and haven't actually found one for that particular car that's available.
 

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2004 350z track coupe
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Discussion Starter · #4 ·
Yesterday I also tried another scenario I found online, I removed both camshaft sensor connectors and with the crankshaft sensor still plugged in, tried to start the vehicle again. Still would not start. I did get DTC P0340 & P0345 for the corresponding camshaft sensors that were unplugged. I do have new OE Hitachi cam & crank sensors on the way so i will replace those as a matter of course but am losing faith that those will resolve this issue.
 
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