ECU Diagnostics?

[Damo]

I have been trying to do this all morning with no luck. I have read how to enter diag. mode but my ecu does not have the selector screw, and also does not have the diag connector. Therefore i cannot enter diag mode.

I dont have any LEDs on the ecu either so i guess i go by the engine check light.

I have a 95mdl GTST, anyone else have this problem?

[blind_elk]

Do you actually have a Nissan ECU, or has it been upgraded with a PFC or similar aftermarket ECU? If that's the case, diagnostics is impossible.

[Damo]

Nope it is the original ECU.

[gtr jason]

Nope it is the original ECU.

just jap can tap into your computer with A SCANNER $50

[ylwgtr2]

under the dash on the drivers side there is a connector with 14 pin holes (2 rows of 7 pin holes) in it....looking at the front of the connector with the chamfered end facing the left you need to switch the ignition on and touch the 6th and the 7th wires on the top row together for a second with a paperclip,the vehicle will enter diagnostic mode....

[Craved]

mine didn't have the LED's but it did have the screw (94 model) where are you looking at the ecu? have you pulled it right out?

on this note i thought it good to mention that when i did mine it came up all good code 55.. but this happened even when i disconnected my injectors, CAS,AFM and water temp sensor.. so i dunno how helpful it is!!

[kjb_r33]

Where are you, i can get hold of a carmen scan tool, does all imports to current models and also displays active data.

[Damo]

under the dash on the drivers side there is a connector with 14 pin holes (2 rows of 7 pin holes) in it....looking at the front of the connector with the chamfered end facing the left you need to switch the ignition on and touch the 6th and the 7th wires on the top row together for a second with a paperclip,the vehicle will enter diagnostic mode....

Thats the problem, there is no connector. Can anyone post a pic of where theirs is?

[Damo]

mine didn't have the LED's but it did have the screw (94 model) where are you looking at the ecu? have you pulled it right out?

on this note i thought it good to mention that when i did mine it came up all good code 55.. but this happened even when i disconnected my injectors, CAS,AFM and water temp sensor.. so i dunno how helpful it is!!

Yeah i took the ecu right out and there were 2 holes, possibly where the LEDs go on the other models. Mine just had a blanking sticker over the holes.

[JAS-25T]

sorry to hijack

but i wanted to get my ecu out to see if it is a stock one or not, cause it doesnt cut out at 180

can anyone help?

ive tried to get the kick panel out but after i take off two screws it is still connected by something else behind it

[Damo]

Where are you, i can get hold of a carmen scan tool, does all imports to current models and also displays active data.

Does the scan tool plug into the wiring harness or ecu or both? I would be interested in been shown what it does.

I am in quakers hill, about 25 mins from penrith

[Damo]

sorry to hijack

but i wanted to get my ecu out to see if it is a stock one or not, cause it doesnt cut out at 180

can anyone help?

ive tried to get the kick panel out but after i take off two screws it is still connected by something else behind it

Mine only had the 1 screw closest to the front near the firewall but has 2 clips that need a good tug to break free. get a commone screwdriver and wedge it between the panel at the back of it, near the door seal.

[JAS-25T]

i had to lift of the plastic sill (with skyline embossed) then unscrew that plastic nut near the firewall

then i unscrewed one of the dash compartment screws so that i could get it out a bit easier

once i done that it still has a clip of some sort that needs to be undone or something, im guessing that is what needs a good tug?

[ylwgtr2]

the connector is there.....the carmen thing wouldnt pick up all the codes on my car....i rectified mt problems with the onboard diagnosis system

[Damo]

I spent about 20 minutes looking inside the panel for the diagnostics connector with no luck. Can somone post a pic, I am sure my car does not have one, which is really starting to confuse me.

[paulr33]

see attached

[PTR33]

The connector is visible through the fuse panel in front of the drivers right knee.

It is not over near the ECU. (in case you had got confused...)

[Craved]

Jason, they ECU has 3 bolts holding it in, one on firewall and two on other end!

Damo, mine has a clear platic sticker with Jap writing over the screw.. it's within the hole and needs a small flat head screw driver! if it has no LED's then just turn clockwise all the way the turn it back!

[Damo]

Thanks paul for the photo, i definately do not have that connector in the fuse panel.

Chris, I have shined a torch in the holes there is no screw there either.

is it possible i dont have the corrrect ecu for my model car?

[blind_elk]

mine didn't have the LED's but it did have the screw (94 model) where are you looking at the ecu? have you pulled it right out?

on this note i thought it good to mention that when i did mine it came up all good code 55.. but this happened even when i disconnected my injectors, CAS,AFM and water temp sensor.. so i dunno how helpful it is!!

The engine needs to be running. Disconnect Water Temp sender with engine running, then run diagnostics.