djones 1954

2013 370z. 24000mi Car stalled at intersection. Scanned and P0340 code. Replaced both cams and crank sensor. Checked wiring back to ECM, good continuity and good voltage feeds to all sensors. Grounds good. Sensor phase (orange wire) good. Car will start IF bank one sensor is unplugged, will not start with both cams plugged in. Limp mode!!!!!

travlee

iTrader: (8)

was this a question, or a rant?

djones 1954

Both. I need to look another direction. Its still down. HELP!

djones 1954

Had it at Midland Nissan and they didn't tell me anymore than I told them. They didnt think it could start with bank 1 unplugged. It does. They wanted a blank check to "Research it". They say that Bank Two is not getting correct electrical signal. Both banks are getting 5.4 volts to sensors power wires.

Atreyu'z 350

Did you replace the sensors with OEM Nissan sensors?

djones 1954

Sure did. I can swap sides and it still only starts with bank 1 unplugged. I checked all 3 wires back to ECM continuity good. No wire going to ground. Voltage is at 5.4 V on green wire. Checked cam fingers, all there and clean. Could it be as easy as the ECM gone bad? Any way to test it?

Atreyu'z 350

OK.. It's tricky diagnosing this kind of electrical problem without being in front of it..
Assuming the sensor is installed properly and detecting the camshaft 'target' on bank 1, then it's either compromised wiring or a faulty ECM. You may be able to tap into the ECM via CAN, and see if it is receiving the signal from the cam sensor. Also, try putting the bank 1 cam sensor back in and rotating it a couple degrees clockwise until it starts. When/if it starts from that, reset the ECU to get out of limp-mode. Sry, dude, but that's all I have for you right now...

djones 1954

UPDATE!
Got a Snap On Scanner and ECM is receiving signal from bank 1 just 17deg retarded.
Looking like its time to pull the front cover off n check chains. Unless there's a better route. AnyBody??
All at only 24000 miles.

zakmartin

If the cam sensor's pulling back that far, it could be a faulty pulse width modulated solenoid, which would affect the Continually Variable Timing Cam (CVTC) if it's in a stuck position and not allowing oil to build pressure to advance the cam. That'd explain the constant 17 deg retard reading anyway, particularly on a CVTC engine. I really doubt it's a chain at only 24,000 miles, but hell, anything's possible; you'll need to do an inspection to be sure. You're supposed to get about 39 degrees of mechanical play on a CVTC engine, so if it's stuck in one place, something could be wrong with the pressure system that controls it.

djones 1954

After going to 2 Nissan Dealers and getting the same obvious diagnostics, same ones I pulled up with my hand held scan, to replace sensors. They wanted to replace wiring harness. I finally got a Nissan (#3) mechanic to figure it out and contact NISSAN about the problem. FINALLY concluded it was the entire timing chain assembly, at 23K easy miles. Thanks Nissan of Abilene Texas you saved a burning Z. Nissan did warranty the repairs. So don't give up if yours does the same thing.

zakmartin

Damn! That's nuts that you need a new chain at 24K, but hey, at least it's a warranty repair