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Registered
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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"When the switch closes it is supposed to provide a ground input to the Lambda control unit (lead number 7 on the harness) which should allow the system to go into closed loop operation"
You have it backwards. The pin 7 grd causes the Lambda unit to enrichen the mixture
for cold running. Once the engine warms, the switch opens which allows the O2
sensor to affect the mixture.
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Loren
Systems Consulting
Automotive Electronics
'88 911 3.2
'04 GSXR1000
'01 Ducati 996
'03 BMW BCR - Gone
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