NIStune Z32 ECU - Manual (Page 4)

1) Knock Sensor inputs – pin 23/24
The R33 RB25 engine uses twin knock sensors with Nissan part number 22060-56S10
(shared with R32 RB20DET). Z32 VG30 only uses a single knock sensor but with different
Nissan part number 22060-30P00 (shared with various SR20 engines).
RB25 knock sensor wires 23 (cylinder 1-3) and 24 (cylinder 4-6) go into the Z32 ECU
however the Z32 ECU only uses a single knock sensor input, on pin 23.
After customer feedback we recommend only leaving a single knock sensor connected
which will cover knock for part of the engine block.
Otherwise we recommend stubbing out the knock sensor input by using a resistor to
remove knock sensing input completely if during tuning the ECU appears to be
oversensitive and pulling additional timing.
Stubbing out involves cutting the pin 23 knock sensor wire at the loom and soldering to a
470Kohm resistor between this wire and sensor ground (pin 30) on the ECCS harness.
Note: Internal modification alternative:
(a) Bottom side of ECU. Solder 470K ohm resistor between C860 ground pin and
pictured knock sensor through hole which comes from Pin 23
(b) Cut the track from Pin 23 to the knock sensor track through hole on the top side of
the ECU