Vitara JLX 4dr Auto Tacho Not Working

[fixkick]

all good. this is an alternating current signal, the tacho is dead, if brown wire dies, the EFI kills injections.
your tach is dead. or its screws at rear of the cluster head flex-PC card, are corroded.
the ECu sees a 50v pulse. (a scope only works here) see pulse here.

http://www.fixkick.com/look/ECU-secrets/...ge_30.html

how i clean them is here.
http://www.fixkick.com/sensors/speedo/sl...ge_15.html
and your tacho pins are on left side
seen
here
left center screws
http://www.fixkick.com/sensors/speedo/sl...age_6.html

my 91 had no tacho.
so i bought 3 used heads off fleabay and made one good head with tacho.
the screws on the left are tacho screws. the car rust the copper is bare (suzuki bad act there)
http://www.fixkick.com/sensors/speedo/sl...age_6.html