Diagnostic Codes

[Lextreme II]

1st Gen LS400/SC400 Diagnostic Codes

2nd Gen LS400/SC400 Diagnostic Codes

Diagnostic & Symptoms

 

[jtjerry]

air suspension codes for LS???

 

[Sir Charles]

Good info to have around.

 

[NS801241]

I have a 92 SC400.Can't get rid of check engine light.(code 52,#1 knock sensor). Replaced both knock sensors, replaced KS connectors, ohmed out wiring, no problem found.Only thing left is ECU.Is there anything I overlooked?Looking for answers.

 

[sideshow]

I had a supra 2j with same issue
what I did was swap the pins for the two knock sensor
on the ecu plug over. so knk 1 swap with knk 2
if the code stays the same like 52 it's an ecu issue
so I'm chasing a 2j ecu

 

[NS801241]

I had a supra 2j with same issue
what I did was swap the pins for the two knock sensor
on the ecu plug over. so knk 1 swap with knk 2
if the code stays the same like 52 it's an ecu issue
so I'm chasing a 2j ecu

Thank you,I'll try that.

 

[extractors]

I had a similar problem with a JZZ30, 1J. would randomly throw code 52. So I just split the knk 2 signal, and ran than into both pins of the ecu. It worked for a while, then I noticed the same fault coming up at a later date, but without the huge ignition retard whilst driving. Anyway, replaced all the caps in the ecu, and all has been good so far.

Just on a side note, does anyone know if it possible to retrieve codes via the rectangular diagnostics box on 1U ? it doesn't have the oval plug after the engine conversion. It has Pin 'W', which I believe is the CEL wire, but voltage when in diag mode seems very low to trigger a check light.

Brett

 

[shoob]

any further links to the "diag & troubleshooting"?

good info.

 

[pinkytamz]

fault code 56

well i have googled the world and read till my eyes hurt . i have a ucf 20 that i have fitted into my toyota surf and have this annoying code 56 as soon as the key is on . what i have found is that it might be the missing hydraulic oil level sensor missing and i did read one post that said its a blue wire in one plug but its not that good of a description as i have found this wire ( i think ) and grounded it but still have the fault my ECU number is 89661-50240 info i have on this is thatits a 1996 ucf20 out of a toyota celsior . i have most parts wired and working well but this code seems to be a hard one os my question to the group is have i wired it wrong or is there something that i have missed when i wired the engine .and if i was any good at this inter web thing i would put up some picks of my work maybe some one can help me there aswell ..... thanks for listening

 

[George_R]

code 56 doesn't affect driveability on 1996 ECU, just live with it

 

[Starter1uz]

Hi there,
I’ve recently bought a 1993 Soarer 1UZ. An “Engine issue” text translated from Japanese is popping up but the engine is running perfectly healthy. When bridging TE1 and E1 in the Diagnostics box and turning on ignition, no check engine light pops up at all. My Tc to E1 works fine so I know the bridge itself should be touching fine. Just really not sure what I’m doing wrong. Anyone able to help?

 

[Starter1uz]

Thankyou

 

[George_R]

1) te1-e1
2) ignition on and wait
3) verify that check engine light is alive and is wired to ecu properly
4) also verify the same for te1 and e1