Volvo AWD S70 Forum

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computer bad? S70

posted by  shaq on  Thu Oct 31 15:49 CST 2002
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Anybody have a problem with 98 s70 turbo setting check engine light and blowing #5 fuse under hood. Pulled 11 codes dealing with all emissions related items that were powered by that fuse. Checked with multimeter and found that fuse was shorted to ground until I unplugged the motronic computer. Any similar experiences?








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computer bad? S70

posted by  shaq on  Fri Nov 1 06:42 CST 2002
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Found the %#$%@&% problem. Found one of the wires where it goes down into the harness at the back of the A/C compressor had rubbed through another wire. Wierd.








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computer bad? S70

posted by  someone claiming to be bob on  Thu Oct 31 16:56 CST 2002 [RELATED]

Have seen a few cases of the PCV heater shorting out, blowing the fuse. The component in question is mounted in the fresh air hose near the turbo. It has a hose attached (about 5/8") and a two wire conector. It's difficult to see/access. Try unplugging the wire and see if the fuse continues to blow. I believe you have to buy the fresh air hose as a unit to replace it.








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computer bad? S70

posted by  shaq on  Fri Nov 1 03:34 CST 2002
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I've unplugged the pcv heater, both HO2S, PAIR relay, EVAP solenoid,and canister purge solenoid. Still blows fuse. Looked in Volvo S70 motronic 4.4 supplement book and found that there are a couple more things on that fuse. Guess I'll keep searching.







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