Re: Issue with plugs or DTC? - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Issue with plugs or DTC?
Posted by saabdoc [Email] (more from saabdoc) on Tue, 15 May 2012 06:42:28
In Reply to: Issue with plugs or DTC?, JMJinNC, Mon, 14 May 2012 07:58:32
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Actually they are not misfire fault codes. They are combustion detection fault codes. After the IDM fires the spark plug, it sends a low voltage across the plug to measure the ionization of the cylinder. The ionic current measurement is used to replace the ordinary cam phase sensor, knock sensor and misfire measurement function. If there is a extreme amount of carbon on the spark plug, it could effect this test and set the code, but 99.9% of the time it's caused by an internal fault in the IDM (Ignition Discharge Module). There was even a service bulletin from SAAB saying to just replace the IDM.
posted by 71.110.4...
Posts in this Thread:
- Issue with plugs or DTC?, JMJinNC, Mon, 14 May 2012 07:58:32
- Re: Issue with plugs or DTC?, saabdoc, Tue, 15 May 2012 06:42:28 <-- Viewing This Message
- Re: Issue with plugs or DTC?, RickE, Mon, 14 May 2012 16:46:47
- Re: Issue with plugs or DTC?, AdamSAAB2kAero , Mon, 14 May 2012 15:50:36
- Re: Issue with plugs or DTC?, Dean, Mon, 14 May 2012 14:33:22
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