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Your 3-2-1 code may be 'False' 700 1990

posted by  lucid on  Tue Jun 13 03:54 CST 2006
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

This doesn't relate to the other codes you mentioned, but is based on Service Bulletin # 135 from January 1990 (applicable to '89 and '90 740 and 740GL), which says that 3-2-1 may be a false code, due to a circuit modification related to the Cold Start Injector/valve.

As a quick check, peel back the Cold Start connector boot and see if the Blue-Green + wire has been disconnected, taped off, and replaced by another wire (color unknown) directly from the starter solenoid.

If so, you can confirm the modification by checking for continuity from CS pin 2 to starter auxiliary terminal 15a or 16 down on the solenoid. If there is continuity, the Radio (interference) Suppression Relay is no longer in the CS Injector circuit.

QUOTE: "As a result of this modification . . . Fault code 3-2-1 (cold start injector) will be permanently stored in the self-diagnostic memory. However the Check Engine Light (CEL) will not illuminate."

--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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New running rough, code 321 [700][1990]
posted by  someone claiming to be fido  on Tue Jun 13 02:40 CST 2006 >


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