EMS-4 wiring help
#1
EMS-4 wiring help
after many hours of searching still stuck on some wiring. This is for a EMS-4 for a 2002 Engine in a kitcar - no stock wiring.
99 plus is Hall not Mag, correct ?
VVT wires to the VSS pin ?
MAP - wires to Manifold Pressure sensor, correct?
VCC is the 5 volt output ?
now the fun part
3 wire coolant temp. Blk/red (grnd?), purple/white (?), Red/blue (sensor?)or do I have to go to GM sensor?
3 wire crank sensor, Red, Blue, Black - are what?
Savington has been very helpful but don't want to call him everyday
thank you for all help.
99 plus is Hall not Mag, correct ?
VVT wires to the VSS pin ?
MAP - wires to Manifold Pressure sensor, correct?
VCC is the 5 volt output ?
now the fun part
3 wire coolant temp. Blk/red (grnd?), purple/white (?), Red/blue (sensor?)or do I have to go to GM sensor?
3 wire crank sensor, Red, Blue, Black - are what?
Savington has been very helpful but don't want to call him everyday
thank you for all help.
#2
Boost Pope
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All '90-'05 Miatas use hall-effect crank and cam sensors. Well, they're not literally hall-effect, but they are wired as though they were. (eg: open-collector, external pullup.) The only pure magnetic sensors were the crank sensors on '96-'97 cars, and they were used only for OBD-II misfire detection, the main sensors were still hall-style.
Not sure how AEM treats this (can they even do VVT control?) but I can't imagine why it would get anywhere near VSS. VVT needs to be connected to a pin which can directly drive a high-current solenoid.
Vcc typically describes the voltage supply to a device, not the output from it. So in the context of a MAP sensor, Vcc would be +5v from the ECU to the power input pin of the MAP sensor.
The CLT sensors on the '99+ cars are actually two sensors in one.
Red / blue and black / red are the CLT signal for the ECU, where black / red is ground in the stock configuration.
Purple / white is the CLT signal for the temperature gauge in the dashboard. This one goes to ground through the body of the sensor.
Hmm. This doesn't match the documentation I have for any '01+ engine. The crank sensor should be white/red (+12), black/blue (gnd), and violet/white (signal).
Could you post a picture, and also let us know the specific year of the engine? There were some wiring differences between '01-'02 and '03+. Also, is this a US-spec car, a Euro car, etc?
VVT wires to the VSS pin ?
MAP - wires to Manifold Pressure sensor, correct?
VCC is the 5 volt output ?
VCC is the 5 volt output ?
3 wire coolant temp. Blk/red (grnd?), purple/white (?), Red/blue (sensor?)or do I have to go to GM sensor?
Red / blue and black / red are the CLT signal for the ECU, where black / red is ground in the stock configuration.
Purple / white is the CLT signal for the temperature gauge in the dashboard. This one goes to ground through the body of the sensor.
3 wire crank sensor, Red, Blue, Black - are what?
Could you post a picture, and also let us know the specific year of the engine? There were some wiring differences between '01-'02 and '03+. Also, is this a US-spec car, a Euro car, etc?
#3
I'll confirm with AEM on VVT and MAG sensor wiring, VCC is from the ECU so you are correct that it is 5V output. The wires from the crank sensor are Red, Blue, Black but switch to what you stated at the connector on this 2002 engine.
Greatly appreciate the help, a few more wires and then program set up to fire off.
Greatly appreciate the help, a few more wires and then program set up to fire off.
#4
Boost Pope
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Ok, those were two seperate questions.
Yeah, the +5 supply out of the AEM should go to a couple of different places. The MAP sensor is one. The TPS also needs +5 to operate. In the factory wiring harness, pin 4L (a light green / red wire) is the "Vref" pin, which carries +5 to the TPS, the EGR sensor, the FTP sensor, and the transmission control module (for automatic cars).
Oh, yeah. I forgot that the crank sensor has a pigtail on it- I was thinking that the engine harness plugged directly into it like the cam sensor. The pigtail wiring isn't shown in the service manual. It's been a while since I laid hands on an NB engine.
That's a hell of a fun-looking project, incidentally.
Yeah, the +5 supply out of the AEM should go to a couple of different places. The MAP sensor is one. The TPS also needs +5 to operate. In the factory wiring harness, pin 4L (a light green / red wire) is the "Vref" pin, which carries +5 to the TPS, the EGR sensor, the FTP sensor, and the transmission control module (for automatic cars).
That's a hell of a fun-looking project, incidentally.
#6
Former Vendor
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Hmm. This doesn't match the documentation I have for any '01+ engine. The crank sensor should be white/red (+12), black/blue (gnd), and violet/white (signal).
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