AMM ground failure & flat-spots? - Saab 900 Bulletin Board - Saabnet.com
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AMM ground failure & flat-spots?
Posted by LM [Email] (more from LM) on Thu, 13 Mar 2003 13:30:26
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Per Bentley, the AMM should have voltage at either pin #2 or #5, depending on MY, and ground at pin #4 w/ignition on.
Does the AMM's internal circuitry - not the hot wire - go kerfluey (like an ECU), when there's no ground at pin #4? I haven't been able to locate an AMM wiring diagram.
The only other possibility, with all wires and connectors testing good, per the LH wiring diagram, is that the ECU is not grounding the AMM (if the AMM is not supposed to ground internally, thru its own ground pin #1, w/ignition on)
Has anyone correlated flat-spots w/no AMM ground at pin #4 w/ignition on?
91 n/a
Symptom: flat-spot at cruise and going down hills, most prominent @ 2800 RPM
posted by 63.107.25...
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