Non M/C Cage (96 altima) trouble codes

[schnowz]

     Anyone up on these. I thought I knew what the difference between OBD1 and 2 but after the E Mails below from a guy who owns a website with trouble codes I'm not so sure..
    My basic dilema is that the Haynes Manual has a different code to his website. But the Haynes say they changed in 98 (not 96) but I believe they all changed in 96 to meet Federal regs. Even so he seems to be saying there is both a P0XXX type code and a manufactures code that are different even after 96? 
   If you check the E mails below I'm trying to find if the problem for a code 115 engine light is the ECT sensor or fuel delivery problem..
Answers offlist please... unless there are others interested .

Thanks in advance
   Pete S


----- Original Message ----- 
From: Staniforth Peter 
To: schnowz at localnet.com 
Sent: Friday, January 19, 2007 2:38 PM
Subject: FW: Webpage - Trouble codes


 

 


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From: xxxxxxxxxxxxxxxxxxxx

Sent: Thursday, January 18, 2007 9:36 PM
To: Staniforth Peter
Subject: Re: Webpage - Altima Trouble codes

 

The code that is retrieved through the dash would be the Manufacturer's code 0115

In most manuals it would be listed as DTC 0115.

 

Tony

  ----- Original Message ----- 

  From: Staniforth Peter 

  To: Tony 

  Sent: Thursday, January 18, 2007 12:43 PM

  Subject: RE: Webpage - Altima Trouble codes

   

  Tony 

      Thanks for your reply. The code I pulled was from counting the engine light flashes on the dash (after turning the ECM screw). 1 long and 15 short IIRC

  So is this is a P0115 (ECT) or the manufacturer's code 0115 (fuel system malfunction) ?

   

     Thanks again

              Pete

   


------------------------------------------------------------------------------

  From: xxxxxxxxxxxxxxxxxxx 
  Sent: Wednesday, January 17, 2007 1:38 AM
  To: Staniforth Peter
  Subject: Re: Webpage - Altima Trouble codes

   

  You are confusing the P codes with the manufacturer's codes.
  There is a P0115 and the manufacturer's code 0115.

  Both are different.

  So, depending on whether you are talking OBD2 codes or Manufacturer codes, the definitions are different.

  The P0115 and P0125 from 95-2000 are the same.

   

  From the Manufacturer's information.......

   

  1996 Nissan-Datsun Altima L4-2.4L (KA24DE)

   

  P0115

  DESCRIPTION 
  The engine coolant temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

   

  P0125

  DESCRIPTION 
  The engine coolant temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
  OVERALL FUNCTION CHECK 
  Use this procedure to check the overall function of the engine coolant temperature sensor circuit. During this check, a DTC might not be confirmed.
   NOTE:  

  If both DTC P0115 (0103) and P0125 (0908) are displayed, first perform TROUBLE DIAGNOSIS FOR DTC P0115.

  DTC 0115
  ON-BOARD DIAGNOSIS LOGIC 
  With Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the front heated oxygen sensor. The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
  In case the amount of the compensation value is extremely large, the ECM judges the condition as the fuel system malfunction and light up the MIL (2 trip detection logic).

   

  Hope this helps,

  Tony

    ----- Original Message ----- 

    From: Staniforth Peter 

    To: Admin at troublecodes.net 

    Sent: Tuesday, January 16, 2007 10:17 AM

    Subject: Webpage - Altima Trouble codes

     

    Hello

         I see your web site lists the 1995-2000 Altimas as having the same trouble codes. The Haynes repair book shows they changed in 1998.

    I have a 1996 Altima with a 0115 code, which your webpage shows as being the ECT sensor.

    The Haynes manual and another 1996 reference manual in the library lists 0115 as a weak mixture ie fuel delivery, (injector, Fuel pressure regulator etc) air leak or O2 sensor.

     Can you reconfirm that you web page is correct.

    Also your page shows both 0115 and 0125 being the ECT sensor. Are these both referring to the same sensor?

     

        Thanks in advance

                        Pete

     

     

    Peter Staniforth

    Mechanical Design Engineer

    Cooper-Atkins Corp

    33 Reeds Gap Rd

    Middlefield CT 06455

     

    TEL 860 349 3473 x181

    Fax 860 349 8994

    pstaniforth at cooper-atkins.com