Electronics won’t let me start my Z and OBD port and ECU won’t connect. Need a mechan

SteveSAS · 10-23-2019, 06:16 AM

Shouldn't have the fuse burnt before ground was lost?
Or is there a design issue? I haven't looked at these newer Nissan cars but the older ones with Hitachi electronics were very good.

2013-Z33 · 10-23-2019, 10:50 AM

No, the failure mode starts when the ground level at the coil is about 2.5 volts or more above the ground at the ECU. Then the coil's driver turns on and drives the coil's primary to saturation. This becomes a static condition(ECU no longer has dwell control) and slowly overheats the coil module. At this point some of the drivers fail with the input shorted to the output(neg. side of coil). At no point has the peak current through the coil gone higher than normal, its just that its "ON" 100% of the time, that causes the thermal runaway.

10-23-2019, 10:50 AM	#2 (permalink)
2013-Z33 Base Member Join Date: Apr 2013 Location: LA Posts: 8 Drives: 13 370Z Rep Power: 3368	No, the failure mode starts when the ground level at the coil is about 2.5 volts or more above the ground at the ECU. Then the coil's driver turns on and drives the coil's primary to saturation. This becomes a static condition(ECU no longer has dwell control) and slowly overheats the coil module. At this point some of the drivers fail with the input shorted to the output(neg. side of coil). At no point has the peak current through the coil gone higher than normal, its just that its "ON" 100% of the time, that causes the thermal runaway. JARblue likes this.

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10-23-2019, 06:16 AM	#1 (permalink)
SteveSAS Base Member Join Date: Jun 2018 Location: Australia Posts: 61 Drives: 370z Rep Power: 5364	Shouldn't have the fuse burnt before ground was lost? Or is there a design issue? I haven't looked at these newer Nissan cars but the older ones with Hitachi electronics were very good.