I have a 1997 ls400 (built Dec 1996) with no start/no code condition (cranks great). It has no fuel injector pulse (has power to injectors) which lead me to crank / cam shaft sensor problems. Wave form on crank sensor checks out according to my scope but neither cam sensor shows proper wave form during extended cranking. I checked continuity between cam sensors and computer there doesn't appear to be any shorts. I decided to change my timing belt (just turned 180k) everything looks good as far as timing position goes. I think I'm looking for a pinout diagram for the computer with expected voltages. Can anyone give some help finding a next step.

Thanks
JustDo

 

You can find the pin out diagram and the voltage at these links.
https://www.clublexus.com/forums/ls-...ml#post8309795
https://www.clublexus.com/forums/ls-...ml#post9694635

 

Hay Yamae, thanks so much for the feedback I'll check them out.

 

Hay Yamae, thanks so much for the feedback I'll check them out. I'll let you know how things go after I get the timing belt install and can crank the engine over safely.

 

Hi Yamae, thanks again for the previous links. I finished the Timing Belt/ Water Pump replacement and started to troubleshoot my original no start condition. After reading various threads I decided to replace the capacitors not only as a preventative measure but I also thought it might fix my no start problem. When I opened my PCM the capacitors looked great after replacement all passed specifications within the prescribed limits. After plugging in the PCM, I seem to be in the same place I started. I have no spark and no injector pulse. I can create a spark on both coils by putting 12 volts (via a tester) on the IGT Igniter terminal and my injectors all have power going to them but they don't fire during cranking. My crank position sensor looks good on my Snap-on Vantage as I crank the engine (engine RPM indicated on my scanner) but I don't seem to get a great signal from either cam position sensor (both seem to be performing the same). It seems unlikely that both sensors would fail at the same time. When I disconnect the PCM and check continuity in both sensors they both register resistance almost exactly the same and within specifications. Neither circuit indicates a short to ground or open circuit. At this point I'm getting ready to purchase a computer but I was hoping, before I do, that there may be another fix that I could attempt. If anyone has any suggestions I'm open to any and all.

Thanks, Justdo