Electrical circuit for AAR, Where does it trace back to? |
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Electrical circuit for AAR, Where does it trace back to? |
boxsterfan |
Nov 20 2013, 09:10 PM
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#1
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
So, I have been having what I thought was the problem of a stuck-open AAR.
1. Start car cold 2. Car idles at 1800 RPM during warm-up 3. Car gets warmed up and now starts idling at 3,000 RPM 4. Pull input to AAR and you can feel it is still sucking air in (a ton). 5. Plug the input to AAR and idle drops to 950 RPM. Today, I replaced the AAR (thanks fellow 914world member) with another one. However, the problem/symptom persists just as above. So now I suspect I am not getting power to the AAR so that its little bimetallic strip can be heated up. Where does the power wire for the AAR trace back to in the car (74 2.0L)? How can I test that wire? |
SLITS |
Nov 20 2013, 09:22 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
White wire, engine harness, switched power. Power is constant with key in on/run position. Terminal 12 on relay board.
Traces to Terminal 13 on 14 pin main harness connector on relay board. Terminal 13 is Black w/ Red Trace and also used for fuel pump power. With key on, you should have 12 VDC at the AAR connector. |
boxsterfan |
Nov 20 2013, 10:02 PM
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#3
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
White wire, engine harness, switched power. Power is constant with key in on/run position. Terminal 12 on relay board. Traces to Terminal 13 on 14 pin main harness connector on relay board. Terminal 13 is Black w/ Red Trace and also used for fuel pump power. With key on, you should have 12 VDC at the AAR connector. Well, given that the fuel pump works, I suspect yet another bad AAR then? |
r_towle |
Nov 21 2013, 03:33 PM
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#4
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Custom Member Group: Members Posts: 24,624 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
White wire, engine harness, switched power. Power is constant with key in on/run position. Terminal 12 on relay board. Traces to Terminal 13 on 14 pin main harness connector on relay board. Terminal 13 is Black w/ Red Trace and also used for fuel pump power. With key on, you should have 12 VDC at the AAR connector. Well, given that the fuel pump works, I suspect yet another bad AAR then? from sitting on your computer, that is an assumption. Try testing YOUR wiring harness to make sure you actually have power for the AAR... It is powered by the same pin on the relay board, but there are two different wires going to two different places. Rich |
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