It's good to be back after two years since selling my last Supra I recently picked up an 87 where the previous owner swapped in a 7MGTE and was never able to get it to start. Initially the fuel pump would cycle when the key was turned then power would be lost. No spark, Coils. CPS all checked and ok. Found no power at the diag box, checked main fuse panel and the 7.5A igni fuse is blown. I have checked Cygnus (page 1-9 of the electrical schematic) and AllData but I am unable to find the circuit for this fuse. Could someone please point me in the right direction? Thanks
7.5A ignition fuse
- Thread starter KMinAF
- Start date
The 7.5A IGN fuse powers 2 circuits, Charge Warning Light, TCCS ECU.
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=032
It's output from the fuse panel on J/B No. 1 is connector 1G pin 9(Charge Warning Light), and connector 1I pin 6(TCCS ECU)
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=17
The charge warning light schematic:
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=042
The appropriate page in the TCCS ECU schematic:
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=49
Not available in the online TEWD is a third circuit that the 7.5A IGN fuse powers, the Super Monitor Computer, if you have it. This circuit is powered off the same (B-O) wire that powers the TCCS ECU. As such it is connected directly to connector 1I pin 6 on the fuse box J/B No.1, same as the TCCS ECU is. I do not have a link for this but I have verified the other links information against my physical copy of the 1987 TEWD.
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=032
It's output from the fuse panel on J/B No. 1 is connector 1G pin 9(Charge Warning Light), and connector 1I pin 6(TCCS ECU)
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=17
The charge warning light schematic:
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=042
The appropriate page in the TCCS ECU schematic:
http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=49
Not available in the online TEWD is a third circuit that the 7.5A IGN fuse powers, the Super Monitor Computer, if you have it. This circuit is powered off the same (B-O) wire that powers the TCCS ECU. As such it is connected directly to connector 1I pin 6 on the fuse box J/B No.1, same as the TCCS ECU is. I do not have a link for this but I have verified the other links information against my physical copy of the 1987 TEWD.