In order to create a well-defined trig point for the CMP sensor, drill and tap a
hole in the cam gear. Insert a screw into the hole such that the screw head
faces the sensor. The sensor works best if the screw material is magnetic,
such as galvanized steel. The distance between the screw and the sensor may
need to be adjusted in order for the sensor output voltage to be high
enough. The output voltage from the CMP sensor needs to be at least 3V.
Do not place the trig point in a place that gives a CMP signal at the same
time that the reference point of the crankshaft pulse wheel passes the CKP
sensor.
Sometimes it’s possible to use one of the camshaft lobes as a trigger.
3.3 Throttle Position Sensor (TPS)
The TPS needs to be of a linear potentiometer type. A
worn TPS can cause problems which are very difficult
to diagnose. Typically, as the TPS ages, the signal
drops out intermittently. Either verify that your existing
TPS is in excellent working order or simply replace it
with a new one. Your NIRA i7x dealer stocks a suitable
TPS.
If your car doesn’t have a TPS currently, you will need to add one. Some
older cars only came with TP switches for idle and WOT. These can not be
used with NIRA i7x.
If you are planning to use Alfa-N calibration at low loads and expect to be
able to adjust the calibration with good precision, you will need a TPS with
excellent temperature stability and very high angular resolution.
When mounting the TPS make sure that it doesn’t bottom out before the
WOT or idle stops. Verify this by observing the TPS while a helper depresses
the accelerator fully and then lets the pedal go completely. At both end
points there needs to be additional travel available for the TPS. If not, adjust
the position of the TPS relative to the throttle shaft.
The TPS mounts on different sides of the throttle housing on different cars.
This will cause the TPS to turn in different directions on different cars as the
throttle opening increases. If the TPS signal on your car is reversed, simply
swap the Throttle Sensor Ground and Throttle Sensor Supply wires.
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