Check Engine Light (CEL) or Malfunction Indicator Light (MIL) on Nissan Frontier

The CEL has been turning on in the nissan for a while.  Suspected it was the fuel filter. Changed it but the light still illuminate after 700m of driving. Spending the whole week checking the car.

This is the sensor that I've check:-
i) Gearbox sensor - there are 4 sensors in the gearbox. Cleaned all the connection and test the car. CEL still illuminate.

ii) Changed the Tachometer sensor (On the bellhousing) and test the car.
CEL still illuminate

iii) Changed fuel filter.
CEL still illuminate

iv) Cleaned the turbo intercooler, cleaned the ambient temperature sensor, refit coolant temperature sensor.
CEL still  illuminate

Running off ideas...I decided to take the multiester/multimeter to test the brake switch. I read somewhere in some forum that the CEL will illuminate if the brake lamp is broken or the switch is broken. Then.....I found the culprit....

 

One of the contact rubber pad is broken. This makes the ECU think that your brake has a problem

 

 

This is how the contact rubber should looks like

Diagram of the brake pedal. Sw1 is signal to the ECU. Sw2 is the brake light.

Replaced the contact rubber pad and test the car....Yahoo!!! CEL is now off ^^v

Nissan Frontier YD25DDT (2005) and Proton Gen2 SP4H (2005) ~ OBD2 Compatible?

Creating this post just to remind me about the information that I collected in case I forget it in the future.

What is OBDII?
> OBD-II is a system used in automobiles to monitor various components of the vehicle, detect malfunctions, and store the information in the vehicle’s on-board computer to be recovered later by a service technician. OBD-II is an acronym for on-board diagnostics; the “II” denotes the second and most current version of this technology. (http://www.wisegeek.com/what-is-obd-ii.htm)





What do it looks like & location?
> Most OBDII slot would be located below the dashboard at driver side (Refer vehicle manual)



ODBII Pinout?



Popular cheap tools to read OBDII signal?
> ELM327 (Most OBDII Vehicle)
> ECUTALK (Mostly Nissan) / Nissan Consult


Bought ELM327 compatible OBD2 reader and test it on Nissan Frontier D22 YD25DDT (2005). Communication to ECU failed. Tried almost everything but failed. I decided to crawled under the dashboard and check.

Nissan Frontier D22 YD25DDT OBDII Pinout

And according to the ELM327 Pinout...

Connection TX(Transmit) and RX(Receive) to ECU missing. That is why the ELM327 refused to connect to ECU. This Nissan used different protocol and need INIT code send to ECU for the ECU to respond. From what I remember, the INIT code are 0xff,0xff,0xef. So, no hope for it to connect to ELM327.

For Proton Gen2 (A) 2005 Campro, the connection using my mobile is successful. I'm using n97 mini and the app OBDScope for symbian. But it only can scan for error code and read engine voltage. Connection using returned error (Using Scanmaster-ELM). Tried the scantool terminal, Switching the protocol but mostly ended with NO DATA. Some modified ELM327 reader in Malaysian market can read the code from proton. So this is the Proton Gen2 OBDII Pinout

Lastly the video to show you that some DIYed OBDII reader connected to proton..Check out his page (http://abumirza-myrobot.blogspot.com/)


   

^^v