Building a diypnp, Standalone harness wiring Options

[HardHead93]

I have been having nothing but trouble with my AEM FIC on my 5sfte set up. I have a 97 Celica GT Convertible with a newly rebuilt engine and a 16G CT-26 turbo set up. The ECU is not working well with the signals the piggyback is feeding the stock ECU. Based on a couple of posts I have seen on 6gc.net, I broke down and bought a diypnp 76 pin standalone. The diypnp has all the features I am looking for and the price doesn't break the bank. I just finished soldering the main board and am about to start doing the harness jumpers. Can anyone provide and example for wiring the diypnp?

[lagos]

Here is the basic idea:

1. Don't connect any of the AC related functions that exist on the OEM ECU to Megasquirt and verify that the AC works just fine without them (with the exception of the idle up functionality).

2. Find the wire that sends the ground switching control signal to the AC relay located in the engine bay on the passengers side of the car. You want to cut this wire and have Megasquirt intercept this signal.

3. Once you have the wire cut, connect the signal side of the wire directly to the Flex input. No need to run this through any MS relays.

4. Connect the PA0 pin to Relay1 IN on Megasquirt, and connect Relay1 OUT directly to the AC relay in the fuse box.


In this configuration Megasquirt will see that the factory ac amp wants to turn on the AC and will delay this signal by a few seconds so that it can idle the engine up first to create a smooth transition. I will take a look at my wiring book and let you know the color of the wire that goes to the AC relay.

This post has been edited by lagos: Aug 31, 2016 - 11:03 AM

[HardHead93]

Here is the basic idea:

1. Don't connect any of the AC related functions that exist on the OEM ECU to Megasquirt and verify that the AC works just fine without them (with the exception of the idle up functionality).

2. Find the wire that sends the ground switching control signal to the AC relay located in the engine bay on the passengers side of the car. You want to cut this wire and have Megasquirt intercept this signal.

3. Once you have the wire cut, connect the signal side of the wire directly to the Flex input. No need to run this through any MS relays.

4. Connect the PA0 pin to Relay1 IN on Megasquirt, and connect Relay1 OUT directly to the AC relay in the fuse box.


In this configuration Megasquirt will see that the factory ac amp wants to turn on the AC and will delay this signal by a few seconds so that it can idle the engine up first to create a smooth transition. I will take a look at my wiring book and let you know the color of the wire that goes to the AC relay.

Is this the wire that needs to be cut? I have it circled in red. It looks like it goes to the MGC pin on the AC amplifier.