In reply to a message from scrimbo sent Mon 15 Aug 2016:
Probably the ‘‘feedback monitor socket’’.
From the book page 294:
FEEDBACK MONITOR SOCKET: Near the ECU within the trunk is a
4-connector socket on the end of a harness
with a dummy plug in it. Two connectors are a black ground
wire and a KB wire with battery voltage on it. The other
two connectors provide a voltage between 0 and +5V (relative
to the black ground wire) that corresponds to the amount
of correction the ECU is providing in its attempts to
maintain the proper Lambda feedback. The GW wire (pin 4 on the
ECU) is for the A bank and the GK wire (pin 10) is for the B
bank.–
David Christensen, Tucson, 13 XJ, 91 XJS Conv, 65 Etype OTS
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