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Since the 1989's EZK ignition shares the 25Amp fuse with LH 2.4, we can forget that known trouble source here ("Fires good on starting fluid..."). I overlooked that fact when converting an earlier pre '89 (LH 2.2) post to use here. So the numbered testing steps I posted above should be revised as shown below in this update.
NOTE: A 12volt Test Light is recommended for voltage tests below. A light will be dim if weak voltage is present, where a meter will still (misleadingly) show 12 volts.
1) Use a test light to make sure good 25A fuse voltage is reaching Fuel Relay terminal 30. "Back-probe" the big red wire in the relay harness plug. Should be a good +12V there all the time, even with Key off.
2) If Relay 30 has good +12V, back-probe relay plug 87-1 (red wire) and turn the Key On. The Test light should come ON when key is On.
3) If Relay 87-1 voltage is OK, back-probe Relay 87-2 for +12v pump power (yellow-red wire) and try starting.
4) If no Relay 87-2 voltage when cranking, the relay might be bad (if it clicked when cranking). Or it could be a known ECU problem if the relay didn't click (see 6).
5) To test ECU for Fuel relay control, back-probe relay 86-2 (Blue-Green wire). The test light should come ON when the Key is turned to ON, then go OFF when cranking the starter (when ECU grounds B-G wire to energize Fuel relay).
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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