Hyster H70FT:
Error 676-4 and blown fuse

Hello,
i'm having an issue with our H70FT B977 with yanmar 3.0 diesel:
the fuel/run fuse is blowing as soon as we turn on ignition key and the engine won't turn on.

I can't find any service manual to follow the wiring loom or where is the fuel pump at all to check for shorts(i'd like to see the wiring diagram).

I also get a persistent 676-4 fail which is a glowplug relay open or reading low, but there's no relay or fuse in the fusebox for the glowplugs, i also can't find the glowplug controller(glowplugs were changed recently).

¿any ideas?
  • Posted 19 Feb 2022 06:07
  • Modified 3 Mar 2022 02:47 by poster
  • Discussion started by diacd
  • Argentina
Showing items 1 - 3 of 3 results.
The relay supply voltage must be 12.V.
The relay is activated when the key is switched on.
The glow lamp is on.
If the voltage is low, the VSM is defective.
Or the battery.
The machine does not have an ECU.
Check the CPS10 VSM pin 9 on the CPS55 connector located on the gearbox. Under the floors.
Cable marked 754.
Check the relay.
It is controlled by VSM.
Wiring diagrams are the same
B977 (H40-50-55-60-70FT), F001 (H30-35FT, H40FTS), G001 (H30-35FT, H40FTS), L177 (H40FT, H50FT, H60FT, H70FT), N177 (H40-70FT), N177 (H2.0-H3.5FT Europe) N177 (H2.0-H3.5FT Europe)
  • Posted 3 Mar 2022 06:01
  • Modified 3 Mar 2022 06:07 by poster
  • Reply by geroj
  • Krivan, Slovakia
Forgot to update the post, managed to talk to a hyster tech which sent me some shcematics.
I did check the relay and it's ok(really annoying you have to take out th entire airbox to access the relay and even then it's not very accesible), bench tested it outside the elevator.
The control line has 8V open circuit when the machine goes in contact.
With the relay plugged it's always 0v.

I want to measure the wire coming out from the ECU, but for that i need a photo/reference of which connector/pin is the one that has the relay line, because otherwise it's quite impossible to trace
  • Posted 2 Mar 2022 23:21
  • Reply by diacd
  • Argentina
Check the glow relay.
It is located under the fuel filter.
Yanmar engine
  • Posted 27 Feb 2022 22:51
  • Reply by geroj
  • Krivan, Slovakia

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