Toyota 3sge & M400 without rpm reading

[TOMATIS]

Hi, please I need some help with an issue that I have with a recently wired package.
The basic info is : Toyota 3SGE engine & M400 with original 3SGE distributor only for ref and sync signals because the
setup is coil per cylinder , MSD coils and MSD DIS 4 ignition module.

The problem is that the ECU doesn t see any rpm reading when cranking the engine on the sensor view screen,
and on the diagnostic errors screen the ref/sync not synced condition is always in red, all other sensors have good
signal because I dont have any other diagnostic error and all sensor measures are right.
Also there is not any ref/sync capture reading.

The starter motor is in good condition , battery voltage is good, also I try with a jumper battery and another distributor but nothing changes the not synced condition and zero rpm.

The wiring to the distributor is very simple only three wires : ref, sync and 0v (engine).
I wired the distributor and do all the ref/sync sensor setup on the ECU manager as stated on the Toyota 24 tooth
magnetic Motec drawing (T11).

Also there is some data that I not sure how to enter on the ref/sync sensor set up:
Ref sensor filter: 1.0
Sync sensor filter : 1.0
Ref/sync rpm site: 7000 rpm
ref magnetic levels: 2.0 volts
sync magneic levels: 2.0 volts
But It appear that all this data is pre difined on the ECU manager .
But the main problem is the zero rpm reading, I am not sure if the lack of this exact data is the problem for the
zero rpm reading and the not synced condition.

I am going to apreciate a lot some guidance with this issue.
Thanks

[stevieturbo]

If it is wired correctly, you should be able to get a scope trace done, and see the waveform and voltage levels.

Failing that, you may need to test it with a scope to ensure it is working.

A trigger threshold of 2v is probably far too high for cranking speeds though, so the ecu may not recognise any signal because of this.
Although it would still display a scope trace.

[TOMATIS]

Thanks for the answer, yes I know It should be able to get a scope trace and read cranking rpm and if there are
errors in the ref/sync sensor setup configuration it should appear on the diagnostic error view screen like
error ref/sync , error no ref/sync signal , ref/sync low levels or noise errors , etc.
But the only message is ref/sync not synced. The wiring to the distributor is very simple only three wires (ref B1)
(sync B2) and (0v engine B16) I check it at least three times . For any reason the ECU dont recognize or read the
distributor signals.

Do you refer trigger threshold of 2v to the ref/sync trigger voltage because they are configured to 0 volts.

Thanks

[stevieturbo]

So you can take a scope trace ? Post it up.

If you cannot do a scope trace and see the signal, then either the wiring is wrong, broken, or there is a fault with the dizzy.

[TOMATIS]

Hi, the ECU doesn t recognize any distributor signal so there is not scope trace or rpm signal on the ECU.
I try with two distributors and no change, also I measure pickup coil resistance and gap between pickup
coil projection and the signal rotor on the distributor and all values are fine.
So I have to recheck wiring and continuity again. Thanks

[stevieturbo]

http://www.youtube.com/watch?v=EE84cGHJfKE

[TOMATIS]

The problem is solved, now the ecu have rpm signal and also synced fine.
It was a wiring problem , maybe a little distracted when looking the wiring diagram.
I wire to the distributor ref input the three wires that are on the noise insulated white cover ref cables
and also to the distributor sync input the three wires that are on the noise insulated white cover sync cables.
I separate the B1 (ref) and B2 (sync) and connected to the distributor ref and sync and problem solved.

Thanks stevieturbo for the useful videos, before I found the problem I measure all the distributor magnetic signals,
It s always great to learn something .

Thanks