distributor adjust

1989 TOYOTA PICKUP
100,000 MILES • 3.0L • 6 CYL • 4WD • AUTOMATIC
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JPMISME1998
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While attempting to adjust the distributor. Bridging the Te1 and T1 fails to flash the diagnostic mode. The bulb for the check engine light is good, lights up on the dash on engine start up. But fails to stay on to indicate no codes when the pins are bridged. Does not flash any codes at all for that matter.
Jun 6, 2022 at 11:43 AM
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STRAILER
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I would check the EFI relay and fuse, if okay the ECU could be bad. here is a wiring diagrams for the system with a guide to help check it out:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens.
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Jun 6, 2022 at 8:59 PM
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JPMISME1998
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Hi, sorry for getting back so late. Finally had some free time to work on the truck. Checked all fuses and the relay. Also pulled the ECU doesn't look like any capacitors swelled or anything on a quick little look. Anything else I can do to further narrow it down to a bad ECU or something else?
Jun 12, 2022 at 3:54 PM
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STRAILER
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If you have checked the wiring with the guide above and everything looks okay, I would try a rebuilt ECU. Make sure the ECU is getting power and ground.

Electronic Control Unit (ECU): Lower R.H. side of instrument panel.

Please let us know what happens.
Jun 13, 2022 at 8:45 AM
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JPMISME1998
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We got a new ECU in. Swapped that out and got everying working. Thank you so much for your help.
Jul 7, 2022 at 1:44 PM
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STRAILER
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Nice work, we are here to help, please use 2CarPros anytime. Can you please leave us a rating? (Copy entire link)

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Jul 9, 2022 at 9:41 AM