Resolved '90 Broken connector at firewall, which wires to which?

[Gabe92RTTT]

Hey folks,

This connector is long gone and the 4 wires are not 1:1 in terms of color on this '90. It starts up and runs but I have no clue what sensors these wires go to under the intake at the moment. The spade connectors are temporary until I can be sure and then get a proper connector. The car starts and idles fine but the tach is reading low and I doubt they are wired correctly. Any help is appreciated!

Harness/firewall side:
Green w/ Black stripe and red tipping
Green w/ White stripe and red tipping
Green w/ Red stripe and red tipping
Green w/ red tipping

Sensor/engine side:
Green w/ Red stripe
Green w/ White stripe
Green w/Black stripe
Black

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[19Eclipse90]

Throttle position sensor and idle position switch. A-55 in the below diagram. The wire for the idle switch on the sensor side harness is a black wire.

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The diagram shows the positions of the wires in the back side of the engine harness connector.

Here’s pictures of the wires on the connector for the sensor side.

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So, from the back side of the engine harness connector:
[01][02]
[03][04]

1 - green
2 - green with black
3 - green with red
4 - green with white


From the back side of the sensor’s harness connector:
[02][01]
[04][03]

1 - black
2 - green with black
3 - green with red
4 - green with white

 

[Gabe92RTTT]

Brian, you are awesome! Thank you so much for taking the time to post that.

 

[EvoSnow42]

Throttle position sensor and idle position switch. A-55 in the below diagram. The wire for the idle switch on the sensor side harness is a black wire.

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The diagram shows the positions of the wires in the back side of the engine harness connector.

Here’s pictures of the wires on the connector for the sensor side.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

So, from the back side of the engine harness connector:
[01][02]
[03][04]

1 - green
2 - green with black
3 - green with red
4 - green with white


From the back side of the sensor’s harness connector:
[02][01]
[04][03]

1 - black
2 - green with black
3 - green with red
4 - green with white

I got a similar problem, the black wire burnt off for me and I have no clue where it attaches to. I have the 4 pin plug still and that side is connected but where dose the other side go? with the way mine is routed it goes from that 4 pin to a wire holding clip next to the idle control sensor then loops back into the wiring harness in the center of the firewall? I recently bought the car and have no idea what the previous owner did with the wiring it’s all over the place and I can’t tell what’s proper and what’s wrong.

 

[19Eclipse90]

The single black wire attaches to the Idle Switch, on the back side of the throttle body.