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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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Installing a 'Check Engine' light on a DME car
I've just put in the cool 'No Bad Days Racing' chip in my 1972 with a 1993 3.6 in it. The chip can manually switch between a stock mapping configuration and a modified one. But the way to determine which mode you're in is that the 'check engine' light comes on when you're using the modified maps. I swear I remember there being a simple way to wire this light in on a car not originally equipped with one, but I can't find where I wrote it down.
Anyone know? Ingo? Ryan? Bueller?
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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10-01-2003, 07:12 PM
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Registered
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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Pin 22 of the 964 DME unit provides a ground to a lamp which is
connected to #15 ("run" on ignition switch). The lamp will be on until the engine starts, given that no DTCs exist. Good Luck Loren '88 3.2
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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10-01-2003, 07:23 PM
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SCWDP- Shock and Awe Dept
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According to Ingo’s wiring diagram (that he wired his w/) the check engine light comes off of pin 8 of the T16 connector, which is the 14 pin connector on the DME side of the harness.
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Ryan Williams, SCWDP '81 911SC Targa 3.6 '81 911SC Coupe 3.2 #811 '64 VW Camper Bus, lil' Blue |
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10-01-2003, 07:28 PM
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Registered
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Yeep that's all there is Ryan and Loren. Pin 22 of the DME is routed through the DME harness to pin 8 on the 14-pin connector labeled T16 under the drivers' seat. It branches off the DME harness close to the DME box.
This signal provides ground to a lamp (the other side is B+) or LED with suitable resistor in series. Radio Shack might have LED's with suitable resistor buit in and a nice mounting socket on the shelf. If you use an LED you need to watch polarity. Kathode to Pin 8 and Anode to +12V. Kathode is the dash and Anode is the triangle. The resistor is something like 600Ohm if I remember correctly. `````LED````Resistor````` ```````````````````````` P8 ---|<|-------|==|---- +12V ```````````````````````` ````K``A```````````````` ````- ``+```````````````` is
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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10-01-2003, 09:45 PM
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1981 Porsche 911SC Targa 3.6
1974 Porsche 911 Targa 3.6
