After reading that almost 30-40% of zeds seen are running in safety boost i decided to do an ECU test tonight.

 

Having never done one before i might of gotten this wrong but any help to explain would be appreciated.

 

accessed the ecu turn the ignition on but didnt start car. Turned pot fully clockwise - waited 3 seconds and turned back.

 

I then get three long flashes and four short flashes. I assume this is a code of 34 as this cycle of three long and four short flashes just continues.

 

Having read the ecu test help page i have found the following...

 

34 Detonation Sensor circuit The detonation sensor circuit is open or shorted (abnormally high or low voltage is registered). Harness and connector

Detonation sensor

 

 

could anyone elaborate????

thanks

Yep, that about sums it up, either cable or Det sensor is Donald Ducked.

yes but in thick mans terms what does this mean on a day to day driving basis

??

that you do not have full power available to you as your running in safety mode

yes but in thick mans terms what does this mean on a day to day driving basis

??

 

means your car is in safety boost mate 7psi, and you wont get full boost 9.5psi usually happen if senser senses detination, in laymens terms pinking or as Andy said det senser or harness fooked. Not an easy job to replace but can be by passed by using a 100ohm resister ;)

oh and by the way everybody, im now a fully fledged member having found out just now that i could pay by bank transfer. so no more being a cheapskate for me....

so isnt it potentially risky to just bypass the sender if the ecu has had a report of pinking / detting. Replacing the sensor with a resistor will still allow the detting to take place but nothing will inform the ecu of this??

 

having just said that im sure a multimeter will show me whether there is a problem with the wiring which could eliminate detting from the problems..

also my car is a jap import

 

my boost gauge only shows from -7 to +7

 

boost goes to just under +7 one bar from the top to be precise

 

not sure how this compares to the +14 gauges

also my car is a jap import

 

my boost gauge only shows from -7 to +7

 

boost goes to just under +7 one bar from the top to be precise

 

not sure how this compares to the +14 gauges

 

It's calibrated in 100mmHg, 700mmHg is damn close to 14psi.

but ifi was running in safety mode wouldnt my boost gauge be only hitting the halfway mark on the scale?? it is roughly one bar from the end of the gauge

 

having only ever driven one z i wouldnt know the difference between normal and safety boost. are there any tell tale signs of safety boost

also would i be right in thinking that the car would now be running very rich thus costing me a lot more in fuel than it should be??

 

thanks

if the ecu has gone into safety mode ie code 34 it retards the timing and alters the fuel mapping so you wont get the correct amount of fuel delivery as you would with code 55 (no faults) locate the det senser conector at the rear of the engine and clean it from any of the dreaded green shit

will do. How do you then reset the ECU. Do i need to reset it.

 

Would it reset if i took the battery off, and pressed the brake down, then reconnect the battery again??

 

plus wouldnt i have noticed things wrong if the timing was retarded and the car was in safety boost??

Guess i will notice the difference once its out of safety boost.

Reset ECU, remove battery for about 1hr.

The resistor you need is a 1 MEG Ohm if your sensor is fooked. I have one fitted to mine as mine is shafted. The sensor is only any good at

my engine is as quite as can be from idle to redline??

will do. How do you then reset the ECU. Do i need to reset it.

 

Would it reset if i took the battery off, and pressed the brake down, then reconnect the battery again??

 

plus wouldnt i have noticed things wrong if the timing was retarded and the car was in safety boost??

Guess i will notice the difference once its out of safety boost.

 

go through this site http://www.300zx.org.uk/ :D

thats what i love about this forum. comedians from start to finish of every thread :-)

thats what i love about this forum. comedians from start to finish of every thread :-)

 

meaning :confused:

ignore me, having my funny five minutes at the time.

Picking up some resistors tomorrow night so will let everyone know if i have cured my safety boost issues.

 

Thanks to the help received by all

well the zed fun seems to have started for me. Cant really complain because i guess i got good news.

 

Took the car to my garage tonight with the intention of sorting my ecu error code of 34 out. Turned ecu into diagnostic mode just to check it was a code 34 and it was showing 55. So i took it out for a quick thrash and then tried the ecu again after a hard drive and still code 55??

 

i thought the ecu would need resetting before it would go back to a code 55 from a code 34??

Guess its not bad news though as 55 means all good....