Another AEM Wideband issue

[Justin_l_]

I am having an issue with my AEM uego wideband, it will log on ecmlink but it will not display on the gage. The gage will cycle from 0-9 then start again. I'm using the buffer circuit from ecmlink and wired it up so white wire goes to pin 4, red goes to green/red from ecu, black goes to green/black of the ecu, blue is taped off. Am I missing something simple here?

 

[eclipsegsx1736]

Oops! Sounds like you hooked the power and ground wires for the AEM gauge to the 5v sensor reference power and the sensor ground wires. Disconnect the gauge from these wires immediately, you risk damaging the ECU by overloading the 5v circuit. Those wires are only designed for thermistor and transducer-type sensors, which draw very little current. A wideband unit draws much more current (because of the built-in heater), and also operates with 12v power.

Re-connect the red wire to switched 12v power (ignition power, for instance) and ground the black wire to the chassis.

 

[Justin_l_]

Apparently I don't understand this. This is off ECMlink :

Connect "+5V from ECU" to the ECU's +5V sensor power, pin 23 (Green/Red) on a 1G ECU or pin 81 (Green/Yellow) on a 2G ECU. This is also present under the hood at the MAF, TPS and MDP sensors.

Connect "GND to ECU" to the ECU's sensor ground, pin 24 (Green/Black) on a 1G ECU or pin 92 (Black) on a 2G ECU. This is also present under the hood at the MAF, TPS, MDP and coolant temp sensors.

If the sensor is a 5V sensor that draws little current, like a MAP sensor, connect the sensor's power, signal and ground connections to the input side of the buffer circuit assembly. If the sensing device, such as a wideband, has its own power and ground, connect only the sensing device's signal wire to the input side of the buffer. In either case, you still must provide +5V and GND to the buffer circuit and you must then insulate any unused wires.


Ok after slowing down and thinking for a minute, I have a 12v accessory tied into a 5v source. I need to keep the 5v power and ground for the buffer circuit, remove the power and ground for the wideband and run to a 12v source and ground. Damn I feel dumb. Let me go try this and see if it works. Thanks!

 

[eclipsegsx1736]

Apparently I don't understand this. This is off ECMlink :

Connect ”+5V from ECU” to the ECU's +5V sensor power, pin 23 (Green/Red) on a 1G ECU or pin 81 (Green/Yellow) on a 2G ECU. This is also present under the hood at the MAF, TPS and MDP sensors.

Connect “GND to ECU” to the ECU's sensor ground, pin 24 (Green/Black) on a 1G ECU or pin 92 (Black) on a 2G ECU. This is also present under the hood at the MAF, TPS, MDP and coolant temp sensors.

If the sensor is a 5V sensor that draws little current, like a MAP sensor, connect the sensor's power, signal and ground connections to the input side of the buffer circuit assembly. If the sensing device, such as a wideband, has its own power and ground, connect only the sensing device's signal wire to the input side of the buffer. In either case, you still must provide +5V and GND to the buffer circuit and you must then insulate any unused wires.


Ok after slowing down and thinking for a minute, I have a 12v accessory tied into a 5v source. I need to keep the 5v power and ground for the buffer circuit, remove the power and ground for the wideband and run to a 12v source and ground. Damn I feel dumb. Let me go try this and see if it works. Thanks!

Yes, sounds like you got it figured out. The buffer circuit will need 5v and sensor ground from the ECU, but the wideband unit itself needs +12v switched power and a chassis ground.

 

[Justin_l_]

Yup, all better now! Thanks!