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ECU indentity numbers


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the 8 bit were on the earlier cars and the 16bit were on the later cars that conformed to OBCII spec (onboard diagnostics basically)

8 bit and 16 bit refers to the amount of data the ecu's cpu can address at anyone time, and also has some bearing on the total addressable memory available to the cpu.

 

IIRC someone did once say that having an 8 or a 16bit ecu made no difference to a standard car but it was much harder (if even possible??) to chip a 16bit

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90-92 NA's are 8 bit (93 NA's are 8 bit depending on the month)

90-94 TT's are 8 bit

everything above those are 16 bit.

 

1996 is OBD II

 

It is possible to socket and chip a 16 bit ECU

Ashspec and JWT does it.

 

You can tell an 8 bit ecu on the outside by the gold color it has

16 bits are silver.

 

An 8 bit ECU has a doughter board built in. The 16 bit does not.

 

 

Here is an ECU identification chart

http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF

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Fault code table

Code Fault

11 CAS in distributor, rpm or crankshaft position sensor

12 Vane/hot-wire AFS

13 CTS

14 Vehicle speed sensor

21 Ignition signal circuit

22 Fuel pump

23 Throttle position sensor - idle

24 Throttle position sensor - full load or neutral/park switch

25 Auxiliary air valve

26 Turbo boost pressure sensor

31 Air conditioning (A/C)

31 No faults detected (non A/C) r

31 ECM - GA16I/CA18DE engines

32 Starter signal

33 Oxygen sensor

34 Knock sensor circuit

34 Throttle position sensor - SR20Di engines

41 Air temperature sensor

42 Fuel temperature sensor

43 TPS circuit

44 No faults detected

51 Injectors

54 AT signal lost

55 No malfunction in the above circuits

Note: If code No. 11 and code No. 21 are both displayed in the same incident, check the CAS circuit before checking other circuits.

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90-92 NA's are 8 bit (93 NA's are 8 bit depending on the month)

90-94 TT's are 8 bit

everything above those are 16 bit.

 

1996 is OBD II

 

It is possible to socket and chip a 16 bit ECU

Ashspec and JWT does it.

 

You can tell an 8 bit ecu on the outside by the gold color it has

16 bits are silver.

 

An 8 bit ECU has a doughter board built in. The 16 bit does not.

 

 

Here is an ECU identification chart

http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF

 

My ECU isnt on that list?! LOL

 

2371M 41P14

 

A18-000 MC9K

 

3X01

 

Mine is apparantly remanufactured (has had a Mines Chip in it)

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Fault code table

Code Fault

11 CAS in distributor, rpm or crankshaft position sensor

12 Vane/hot-wire AFS

13 CTS

14 Vehicle speed sensor

21 Ignition signal circuit

22 Fuel pump

23 Throttle position sensor - idle

24 Throttle position sensor - full load or neutral/park switch

25 Auxiliary air valve

26 Turbo boost pressure sensor

31 Air conditioning (A/C)

31 No faults detected (non A/C) r

31 ECM - GA16I/CA18DE engines

32 Starter signal

33 Oxygen sensor

34 Knock sensor circuit

34 Throttle position sensor - SR20Di engines

41 Air temperature sensor

42 Fuel temperature sensor

43 TPS circuit

44 No faults detected

51 Injectors

54 AT signal lost

55 No malfunction in the above circuits

Note: If code No. 11 and code No. 21 are both displayed in the same incident, check the CAS circuit before checking other circuits.

 

No, the above are the fault codes as presented by the ECU when interogated by a Consul or ConZult diagnostic kit.

 

The numbers Shunter originally enquired about are the actual part numbers as labled on the outside of the ECU.

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