Tachometer Issue

[pwpanas]

Originally Posted by top-tuner

My Supra has no mods on it the only thing is that it was
converted in Japan with a 2JZGTE engine.
The body is a year 2000 non turbo and then they swap
a turbo engine and harness in it .
I did a check on the crank trigger wheel and it looks fine
no damage there ......
Do you think there is a internal damage like broken valve
guides or valve seats ???

GRT,

Actually, an engine, harness (and ecu?) swap is quite a big mod.

Another source for RPM is the cam sensor pickup on the head. It's quite strange though, because a problem with any of these sensors will likely throw a code or two.

Sorry to say my knowledge of the n/a chassis (i.e. the n/a odometer and the n/a dash harness) is somewhat limited. I'd guess that the rpm signal to the oem n/a tach comes from the ecu. You should be able to trace that signal with a good automotive multimeter, and the TSRM (I'd guess the US-spec TSRM would work for this, despite the Mkiv US-Japanese differences, if you need the documentation in English)...