Cam Position Sensor
#1
8th Gear
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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
Thanks
JustDo
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BNastee (08-23-22)
#2
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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
https://www.clublexus.com/forums/ls-...ml#post8309795
https://www.clublexus.com/forums/ls-...ml#post9694635
#4
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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.
#5
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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
Thanks, Justdo
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