ECU not signaling the relay for the SAS air pump.

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Old Jan 11, 2022 | 01:00 PM
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Default ECU not signaling the relay for the SAS air pump.

Hi, newbie here.

I have been restoring my 1998 V70XC for a bit, and am having a problem with the pump not coming on. No CEL or codes from the ODB.

New pump
Relay is good.
Power circuit wiring to the pump is good.
12 volt at terminal 86 when Ignition is turned on.
No ECU grounding signal at terminal 85 on cold start.

Vacuum to the air control valve on cold start. That pneumatic circuit is working OK.

Does anyone have any words of wisdom or a wiring diagram for that relay between the ECU and the relay terminal 85?

Thanks in advance for any help.
 

Last edited by mswann60; Jan 11, 2022 at 04:48 PM.
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Old Jan 13, 2022 | 11:17 PM
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OK, a buddy of mine with an All Par account let me know that the SAS relay signal wire is blue/pink, and it goes to B38 on the ECU. I'll check it out this weekend.
 
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