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I think you mean an LH 2.2 (not K-jetronic) relay. The following may be too "busy" but here it is for what it's worth:
The Fuel Injection relay is mounted inside, on the firewall, just above the passenger's feet. It's switched input voltage comes directly from the 25 Amp blade fuse near the battery.
There are actually two relays inside the case, referred to here as "Main" and "Fuel". By following the operation described below, a Test Light or meter can be used to diagnose "no start" problems. This description is based on the Bentley/Haynes wiring diagrams for the '86 LH 2.2 (as are the wire color abbreviations). The FI relay is #217 in the diagrams.
The relay terminal functions also apply to the 700 series B230 with LH 2.2, but the wire colors will differ and the relay connector is not easily accessed. "Tnn" means relay terminal number. The term "pick" means energized.
1. Key ON II —> Main Relay picks with +12v on T30, and Ground on T86-1, as follows:
•> +12v on T30 (R wire) from 25 Amp fuse.
•> Ground on T86-1 (Y/SB wire) to ECU #21.
••> Main Relay T87-1 now feeds +12v to ECU #9 (OR wire), and AMM #5 (OR wire).
2. Key ON III (cranking) —> Fuel Relay picks with +12v on T-85, and Ground on T-86-2, as follows:
•> +12v on T85 (R/SB wire) from (Conn. unknown), and Ignition Switch.
•> Ground on T86-2 (BL/GN wire) from ECU #17, IF ECU #1 gets Ignition pulses from Ignition CU #8.
••> Fuel Relay T 87-2 (Y/R wire) now feeds +12v to:
•——>(Conn. unknown*) Main Pump (Y/R wire)
•——>(Conn. unknown*) Fuse #4 (Y/R), thru fuse (Y/R) to Tank Pump
•——>Injectors (Y/R)
•——>Idle Air Control (BR)
* The 4-pin connector under glovebox?
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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