C1762 with operational AHC (1 Viewer)

[ike84]

Question - had anyone ever registered this code on techstream while the AHC system is operating normally?

I got tech steam working and went to dial in the suspension today. The system has been working as expected (at least, I think it is - the truck 06 lx470 is new to me), allowing me to cycle through H N L without issue. I was surprised that the system showed the code C1762.

According to the FSM, this is likely the pump not building pressure quickly. I'll try the formal bleed process tomorrow (with the jumper and button sequence). What I can't figure out though is that the FSM says that this code should shut the system down, which it has not done.

Maybe this is a ghost code? FWIW, the pressure sensor seems to operating normally but I will check it with the FSM procedure while bleeding.

 

[suprarx7nut]

Perhaps the code was stored and not active?

 

[ike84]

Perhaps the code was stored and not active?

That's what I am thinking too, but thech stream says that it is current.

Headed to the garage shortly to do the bleed process. Perhaps there is just a pocket of air at the attenuator or control valve assembly.

I should note that the other codes on that screenshot are cleared now (bad battery and a worn out evap hose) but the c1762 persists

 

[ike84]

i got the code cleared finally. techstream was unable to do it successfully (?) despite 3 attempts after 3 bleed procedures yesterday. what finally did it was the reset method i used when my system first started acting strangely - starting the truck with the relay removed and wiring harness disconnected. i put it all back together, ran a diagnostic, and it was gone.

this truly does puzzle me. the computers in this truck are the most finnicky i have ever dealt with. i hope thats not a problem isolated to this rig.