Code AD-1 - Maintenance & Troubleshooting discussion in Forkliftaction's forums

Discussion:
Code AD-1

Toyota 8FGCU18

I am working on an 8 series with an AD-1 code. Another tech was trying to wire in a 12V accessory plug and attempted to wire into the fuse box in an empty relay socket. The relay is labeled NTRL ST and is next to the LPG main relay but I can't find it in the schematics. I am assuming the 12V switched coil power comes from the ECM and has caused this code. The wiring has been removed and I have checked all of the A20, A21, and A36 connections. Any ideas?

Posted 4 Dec 2018 06:27
By Gearhead
joined 23 Mar'10 - 9 messages
Ohio, United States

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Hi godd day to you
I have same issue about the AD-1 wont work the engine start up the LPG solenoid not open i try to looge the hose from Solenoid supply and dosent come out the lpg reason engine crank only no supply no also in Distributed caps
Can you help me to solve it any idea so that i can continue

Posted 10 Jun 2023 18:22
By jonathan_l
joined 8 May'18 - 6 messages
Jeddah, Saudi Arabia

Im a hero

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AD-1 is Canbus communication engine data reception error. I may have useful troubleshooting info, contact my profile.

Posted 4 Dec 2018 14:08
By tom_p
joined 21 Feb'11 - 198 messages
Alberta, Canada

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