Introduction

I'm really surprised that everyone does not have consult. The consult cable is selling for about 30 plus shipping on ebay. Newer laptops dont have a serial port so you have to find a serial to usb adapter or buy one of the consult cables that have usb connector. Working serial adapters are so expensive and unreliable that it is better to buy the cable with the usb connector if you dont have serial port. You can retrieve and clear self diagnostic codes without touching ecu.

ECUtalk has the best prices: http://www.ecutalk.com/interface.aspx

About $50/$37 US for the the cable . No tax and free shipping.

Discussion on finding a serial to usb adapter (avoid doing this)

http://www.sr20forum.com/rom-e...88270

Modified by vancouverbc at 4:03 AM 5/18/2009

Modified by vancouverbc at 4:11 AM 5/18/2009

Modified by vancouverbc at 2:45 PM 8/25/2009

obd scan tech seems to be best and is free. You can change aac values, turn egr solenoid off and on, turn off cylinders to isolate problem cylinders. Not sure if you can test hicas. Maybe start with ecutalk until you get used to things as it is simpler to download and use.

nissan datascan ($33) - for map tracing, active tests, most things
ecutalk - best for logging if u want to analyse later
calumsult - for rom dumping, real-time graphs

windows:

free:
OBD ScanTech Nissan - http://techdiag.co.uk/obdscantech/web/pg002.html

(download version 1.41 and copy the updated exe file 1.51 to program files in window explorer; version 1.29 doesnt have the power balance test)

CalumSult - http://www.calumsult.com/calumsu/CalumSult/
-and use the old version for rom dumping (download the full installer, install, then download this exe)

ECU Talk - http://www.ecutalk.com
Conzult - http://300zx-twinturbo.com/conzult/downloads.htm
TECU - http://eccs.hybridka.com/viewtopic.php?t=263
srtalk - http://www.zcontrol.net/Default.asp

$$$:
Nissan Data Scan - http://www.blazt.biz/products/datascan.php $33 US
Datalog Viewer - http://www.blazt.biz/products/dviewer.htm (for datascan logs)

pocket pc:

free:
ECU Talk - http://www.ecutalk.com

mac
ConSultan - http://members.cox.net/epooch

http://www.blazt.biz/downloads...0.pdf

Modified by vancouverbc at 9:31 PM 5/2/2009

Modified by vancouverbc at 3:56 AM 5/18/2009

Time, RPM, Timing, Throttle, Air Flow, AAC, O2 Sensor, Injector, Duty Cycle, Speed mph, Water Temp F
12:42:47.968, 725, 20, 0.42, 0.98, 30, 0.46, 2.8, 1, 0, 172
12:42:47.999, 725, 20, 0.42, 1.03, 30, 0.46, 2.8, 1, 0, 172
12:42:48.046, 738, 20, 0.42, 1.03, 30, 0.46, 2.8, 1, 0, 172
12:42:48.061, 738, 20, 0.42, 0.99, 30, 0.46, 2.81, 1, 0, 172
12:42:48.092, 725, 20, 0.42, 0.99, 30, 0.46, 2.81, 1, 0, 172
12:42:48.108, 725, 20, 0.42, 1.02, 30, 0.46, 2.81, 1, 0, 172
12:42:48.139, 725, 20, 0.42, 0.99, 30, 0.46, 2.82, 1, 0, 172
12:42:48.155, 725, 20, 0.42, 1.02, 30, 0.46, 2.81, 1, 0, 172
12:42:48.186, 725, 20, 0.42, 0.99, 30, 0.46, 2.82, 1, 0, 172
12:42:48.248, 725, 20, 0.42, 1, 30, 0.46, 2.82, 1, 0, 172
12:42:48.295, 725, 20, 0.42, 1, 30, 0.46, 2.81, 1, 0, 172
12:42:48.326, 725, 20, 0.42, 1.01, 30, 0.46, 2.81, 1, 0, 172
12:42:48.358, 725, 20, 0.42, 1.02, 30, 0.46, 2.81, 1, 0, 172
12:42:48.404, 725, 20, 0.42, 1.02, 30, 0.46, 2.81, 1, 0, 172
12:42:48.436, 725, 20, 0.42, 1.02, 30, 0.46, 2.82, 1, 0, 172
12:42:48.529, 725, 20, 0.42, 1, 30, 0.46, 2.82, 1, 0, 172
12:42:48.654, 725, 20, 0.42, 1, 30, 0.46, 2.82, 1, 0, 172
12:42:48.701, 725, 20, 0.42, 0.98, 30, 0.46, 2.82, 1, 0, 172
12:42:48.748, 725, 20, 0.42, 0.98, 30, 0.46, 2.81, 1, 0, 172
12:42:48.794, 725, 20, 0.42, 0.98, 30, 0.46, 2.81, 1, 0, 172
12:42:48.841, 725, 20, 0.42, 1.03, 30, 0.46, 2.81, 1, 0, 172
12:42:48.872, 725, 20, 0.42, 1.03, 30, 0.46, 2.81, 1, 0, 172
12:42:48.919, 725, 20, 0.42, 0.96, 30, 0.46, 2.81, 1, 0, 172
12:42:48.966, 725, 20, 0.42, 1.03, 30, 0.46, 2.81, 1, 0, 172
12:42:49.013, 725, 20, 0.42, 1.04, 30, 0.46, 2.81, 1, 0, 172
12:42:49.060, 725, 20, 0.42, 0.96, 30, 0.46, 2.81, 1, 0, 172
12:42:49.060, 725, 20, 0.42, 1.04, 30, 0.46, 2.8, 1, 0, 172
12:42:49.106, 725, 20, 0.42, 0.96, 30, 0.46, 2.81, 1, 0, 172
12:42:49.106, 725, 20, 0.42, 1.04, 30, 0.46, 2.81, 1, 0, 172
12:42:49.153, 725, 20, 0.42, 1.04, 30, 0.46, 2.81, 1, 0, 172
12:42:49.169, 725, 20, 0.42, 0.96, 30, 0.46, 2.81, 1, 0, 172
12:42:49.216, 725, 20, 0.42, 0.96, 30, 0.46, 2.81, 1, 0, 172
12:42:49.247, 725, 20, 0.42, 1.04, 30, 0.46, 2.81, 1, 0, 172
12:42:49.278, 725, 20, 0.42, 1.04, 30, 0.46, 2.81, 1, 0, 172
12:42:49.294, 725, 20, 0.42, 0.96, 30, 0.46, 2.81, 1, 0, 172
12:42:49.325, 725, 20, 0.42, 1.04, 30, 0.46, 2.81, 1, 0, 172
12:42:49.340, 725, 20, 0.42, 0.96, 30, 0.46, 2.82, 1, 0, 172
12:42:49.372, 725, 20, 0.42, 0.96, 30, 0.46, 2.82, 1, 0, 172
12:42:49.403, 725, 20, 0.42, 1.04, 30, 0.46, 2.82, 1, 0, 172

Modified by vancouverbc at 4:05 AM 5/18/2009

Modified by vancouverbc at 2:46 PM 8/25/2009

O2 sensor voltage

During idle,(closed loop) the number does not mean much. the sensor is too cool and reads lean. Go for a drive and heat up the sensor and then idle, should read around .8 volts for a few seconds before it cools down. The idle is supposed to be rich. This is why we have the AIV. The ecu ignores o2 sensor during idle ie closed loop.

Outside of idle, use a gauge display to observe as the needle fluctuates between below .2 volts and above .8 volts. Below .2 volts is lean. Above .2 volts is rich. You want it fluctuating between lean and rich outside of idle.(open loop)

AAC percentage

Basically, an optimal idle target rpm is stored in the ecu memory. The ecu works to maintain this target rpm using the aac valve. The fsm says that the aac should be between 15 and 40 percent during idle. It sometimes helps to clear the ecu memory to reset the idle.

1. 50% seems to be a limp mode value for the aac during idle. This can exacerbate a high idle situation.

2. the ecu likes the aac to be at 10% during base timing or idle mode

3. you can set the idle to anything you like and the ecu will attempt to achieve that target idle(by adjusting the idle screw with tps disconnected)

4. you can set the aac value during idle by adjusting the idle adjustment screw with tps connected. for example, i had an aac value of 28% so I opened up the idle valve a little bit and the aac dropped to 16 %

5. if aac is always at 10% during idle, it could mean that there is too much air and the aac has run out of adjustment room. for example, my idle would not change when I turned on my interior heater because the ecu liked that the idle was dropped by the load. I like to have the aac at least a few percent above 10 percent for this reason.

6. the aac value does not go below 10 percent except in rare instances. 10 percent seems to be the floor.

7. Having the fixed orifice as open as possible seems to set a high floor for the idle and prevents stalling. the fixed orifice is the orifice that you adjust with the idle adjustment screw. this orifice is fixed and is not controlled by the ecu. the aac does idle up significantly though when the throttle is closed.

8. AAC increases when interior heater or lights turned on. AAC increases when you turn steering wheel. If the idle is too high because of vacuum leaks, the ecu wont increase aac when interior heater or lights come on.

throttle position sensor

It should be between .4 and .5 volts. My value was .8 volts and this totally screwed my idle. You loosen the two 7 mm bolts and turn tps to adjust.
It's important to clear ecu memory to get rid of old values. (It may be helpful diagnotically to idle with tps disconnect to see if this improves your idle.)

Temperature- this is coolant temperature. Mine was 180 F. I think anything under 200 F is good. You may be able to detect when thermostat opens/closes.

voltage- should be around 14 volts when car is running. Mine drops momentarily when lights come on but goes back to 14 volts.

MAF
-tells you how much air you are getting. maf should be between .8 and 1.2 volts at idle. Wiggle the sensor wires to detect intermittent problems.

Power balance test- will disclose leaking injector, faulty ignition wire or sparkplug, leaking piston rings, etc

fuel pump relay- turns fuel pump off to burn off fuel in system so you can work on injectors, fuel line, etc

Injector time/ duty cycle- measure how much fuel is being supplied by ecu

Timing- you need a timing light to set timing. The ecu counts on your timing being right. It has no way of determing this on it's own.

Modified by vancouverbc at 4:15 AM 5/18/2009

Modified by vancouverbc at 10:35 PM 5/18/2009

Modified by vancouverbc at 2:41 AM 5/21/2009

Matt
Jacksonville, FL

Modified by mattd1979 at 12:04 PM 8/19/2009

this is datascan documentation:

http://www.blazt.biz/downloads...0.pdf

Did the original Nissan Consult shut off the injectors rather then the spark plugs when it performed the power balance test?

Modified by mattd1979 at 1:15 AM 8/25/2009

Modified by mattd1979 at 8:48 PM 8/25/2009

unless of course there was a ignition cylinder cut and injector cylinder cut, but ive never seen more than just the one single thing.

im extremely interested in this for testing my random CEL's that pop up occasionaly.

not for 90/89

http://www.ecutalk.com/downloa...a.exe