Resolved ISC solenoid pinout 90 vs 91+ question

[Elpizer2]

Ok so I'm trying to install a 90 ECU but I think my wiring harness is 91+

On internet it says this, but what pins do I need to swap in order to run a 90 ECU?

1G 4G63 ISC (Idle Speed Control) Motor wiring: (Connector B-04)​

Note: This connector is the same 6 pin connector as the Injector Resistor connector. Don't mix them up accidentally when installing your wiring harness into your vehicle.

• Pin 1 - Blue - Goes to pin 58 at ECU
• Pin 2 - Red
• Pin 3 - Yellow - Goes to pin 59 at ECU
• Pin 4 - Black - Goes to pin 68 at ECU
• Pin 5 - Red
• Pin 6 - White -Goes to pin 67 at ECU

 

[19Eclipse90]

1G All 90's with a 90 ECU and idle surge - Possible solution

Pins 4 and 6 on the ISC connector are swapped on a 1990 versus 1991+.

1990
Pin 4 went to ECU pin 67 (white wire).
Pin 6 went to ECU pin 68 (black wire).

1991+
Pin 4 went to ECU pin 68 (green wire, per the linked page’s diagram).
Pin 6 went to ECU pin 67 (white wire).

 

[Elpizer2]

1G All 90's with a 90 ECU and idle surge - Possible solution

Pins 4 and 6 on the ISC connector are swapped on a 1990 versus 1991+.

1990
Pin 4 went to ECU pin 67.
Pin 6 went to ECU pin 68.

1991+
Pin 4 went to ECU pin 68.
Pin 6 went to ECU pin 67.

Ok but do I know the ISC position? Watching at the ISC solenoid pins or watching with the connector unplugged?

 

[19Eclipse90]

Not sure I understand your question. The wiring is completely unrelated to the physical position of the ISC stepper motor.

If you’re asking which configuration you currently have, I updated the above post with the wire colors that would relate to each.

 

[steve]

Ok but do I know the ISC position? watching at the ISC valve pins or watching on the connector unplugged?

If you're asking which pins are what numbers maybe this will help.

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