Hey guys, I am in the middle of transplanting my 1996 80 from a cummins 4bt to 6bt and while I'm swapping the motors I figured I would attempt to get the factory tach working out since I'm not really happy with the diesel Tiny Tach I've been running. Electrical issues are not my strong suit so apologies in advance. I have looked over quite a few cummins build threads as well as the EWD and just can't come to a conclusion on how to wire it up so I'm hoping the great minds here can sort me out, I definitely wouldn't have made it this far without the wisdowm of kind people on this site.
I am trying to use a stock fzj80 crankshaft position sensor (90919-05041) without any other parts (no ECM, no Dakota Digital, etc...). Here's what I believe is the correct way to wire it - one wire to the sensor connector is a ground, one wire is keyed 12v (this may be unnecessary or incorrect I'm not sure), and one wire is the signal wire the sensor generates a small a/c current on that should go to the tach. I believe the tachometer itself is looking for 3 pulses per revolution and I will be making something to go on the crank pulley/balancer with 3 bosses for the sensor to pickup.
This is bypassing the ECM (it's been removed), but still using the same wire that the ECM would normally provide the signal on which I believe is a black wire pin 10 on E7 connector right behind the glovebox. It's my understanding this signal is not manipulated by the ECM, simply passes it along from the sensor to the tach.
Assuming I have this idea correct, the next thing I need to confirm is which wires on the sensor side are the ground, 12v if needed, and signal. I have made a diagram in ms paint demonstrating my digital art skills and showing what I believe is correct. I'll also include pictures of the sensor and harness wires for reference.
Harness connector:
Sensor connector
I am assuming two wires on the sensor are tied together before the connector (maybe the black and white?) since only two wires run into the sensor itself. If I need to cut open the insulation to confirm this I can. If this is the case, and 12v power is not needed, would just two wires to the sensor be needed even though it's a three wire connector? A ground and signal wire run to that e7 pin 10 black wire? Would this be the blue or grn/ylw wire or is it all interchangeable the way I'm wiring it up. Anything can be ground and the wire I run to the tach will be the signal wire.
After reviewing this post I happened to look at Wheelingnoob 's build thread and in a very recent post he specifies he used a 2 wire dodge crank sensor, not a toyota, and doesn't mention needing 12v power unless I missed it. Think I can still make this toyota sensor work?
I'm trying not to blow up the tachometer being a doofus so I appreciate the help,
Steve
I am trying to use a stock fzj80 crankshaft position sensor (90919-05041) without any other parts (no ECM, no Dakota Digital, etc...). Here's what I believe is the correct way to wire it - one wire to the sensor connector is a ground, one wire is keyed 12v (this may be unnecessary or incorrect I'm not sure), and one wire is the signal wire the sensor generates a small a/c current on that should go to the tach. I believe the tachometer itself is looking for 3 pulses per revolution and I will be making something to go on the crank pulley/balancer with 3 bosses for the sensor to pickup.
This is bypassing the ECM (it's been removed), but still using the same wire that the ECM would normally provide the signal on which I believe is a black wire pin 10 on E7 connector right behind the glovebox. It's my understanding this signal is not manipulated by the ECM, simply passes it along from the sensor to the tach.
Assuming I have this idea correct, the next thing I need to confirm is which wires on the sensor side are the ground, 12v if needed, and signal. I have made a diagram in ms paint demonstrating my digital art skills and showing what I believe is correct. I'll also include pictures of the sensor and harness wires for reference.
Harness connector:
I am assuming two wires on the sensor are tied together before the connector (maybe the black and white?) since only two wires run into the sensor itself. If I need to cut open the insulation to confirm this I can. If this is the case, and 12v power is not needed, would just two wires to the sensor be needed even though it's a three wire connector? A ground and signal wire run to that e7 pin 10 black wire? Would this be the blue or grn/ylw wire or is it all interchangeable the way I'm wiring it up. Anything can be ground and the wire I run to the tach will be the signal wire.
After reviewing this post I happened to look at Wheelingnoob 's build thread and in a very recent post he specifies he used a 2 wire dodge crank sensor, not a toyota, and doesn't mention needing 12v power unless I missed it. Think I can still make this toyota sensor work?
I'm trying not to blow up the tachometer being a doofus so I appreciate the help,
Steve