A/C Idle Up

[91boz]

92 AE92 Corolla Idle does not go up when the a/c is turned on. The A/C works fine but the idle drops when the compressor kicks on. I know there is a circuit that should compensate and kick up the idle when the A/C is on. What or where is this control? Is this strictly controlled by the ECU?

[Flashmn]

if its EFI its controlled by the ecu with the idle-up solenoid.

[retiredat44]

Originally Posted by 91boz

92 AE92 Corolla Idle does not go up when the a/c is turned on. The A/C works fine but the idle drops when the compressor kicks on. I know there is a circuit that should compensate and kick up the idle when the A/C is on. What or where is this control? Is this strictly controlled by the ECU?

it's vacuum, mechanical and electronic. There are diagrams on the Internet, but I don't know the links. Also, there is a sticker under the hood on the car with a diagram.

[91boz]

Flasmn where is this idle up solenoid located? I just did a head gasket replacement and the plug might be disconnected.

[Doctor J]

In 90 Corolla it is located on the firewall next to the windshield wiper motor

[91boz]

OK, Thanks guys! I'll check it out when I get home.

[Gsolo]

i would most likely think its a vacuum line to or from the Idle Up VSV which is what Doctor J referred to next to the wiper motor.

[Flashmn]

In 90 Corolla it is located on the firewall next to the windshield wiper motor

In a carbed car, but in an EFI I think its on the pax side of the intake manifold plenuum.