Nissan Datascan Map Trace Addresses - Nissan Forums : Nissan Forum
 
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#1 Old 01-25-2008, 07:07 PM
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Nissan Datascan Map Trace Addresses - '93/'94 Altima

Here is a list of the memory address locations for the Map Trace function in NDS. This is for the '93 and '94 Altimas (U13 KA24DE 93-94).



Primary Fuel Map

RPM MSB Address: 3475
RPM LSB Address: 3474
TP Address: 31B1

Map Address: 8100
TP Scale Address: 80F0
RPM Scale Address: 80E0


Primary Timing Map

RPM MSB Address: 3475
RPM LSB Address: 3474
TP Address: 31B1

Map Address: 8D00
TP Scale Address: 8490
RPM Scale Address: 8480


Secondary Timing Map

RPM MSB Address: 3475
RPM LSB Address: 3474
TP Address: 31B1

Map Address: 8800
TP Scale Address: 8490
RPM Scale Address: 8480

Once you've filled in the required addresses for the Map Tracing Data, click the OK button and map tracing will start.

Enjoy.



'94 Nissan Altima SE, 5spd.
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps, NGK Ignition wires.
ITEMS FOR SALE

Last edited by jserrano; 01-26-2010 at 09:18 PM. Reason: Incorrect secondary address. Fixed links
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#2 Old 03-06-2008, 09:07 PM
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Nissan Datascan Map Trace Addresses - '96 Altima

Here is a list of the memory address locations for the Map Trace function in NDS. This is for the '96 Altima (U13 KA24DE 96). Others years could also apply but this has yet to be confirmed.

Primary Fuel Map

RPM MSB Address: 3473
RPM LSB Address: 3472
TP Address: 31B1

Map Address: E100
TP Scale Address: E0F0
RPM Scale Address: E0E0


Primary Timing Map

RPM MSB Address: 3473
RPM LSB Address: 3472
TP Address: 31B1

Map Address: ED00
TP Scale Address: E490
RPM Scale Address: E480


Secondary Timing Map

RPM MSB Address: 3473
RPM LSB Address: 3472
TP Address: 31B1

Map Address: E800
TP Scale Address: E490
RPM Scale Address: E480

Once you've filled in the required addresses for the Map Tracing Data, click the OK button and map tracing will start.



'94 Nissan Altima SE, 5spd.
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps, NGK Ignition wires.
ITEMS FOR SALE

Last edited by jserrano; 10-19-2009 at 02:02 PM. Reason: Incorrect secondary address.
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#3 Old 03-13-2008, 11:43 PM
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so these are settings for the tunerpro application???
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#4 Old 03-14-2008, 01:46 PM
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Quote:
Originally Posted by drunkmunky View Post
so these are settings for the tunerpro application???
No, the values refers to a function called Map Trace in the Nissan Datascan (Nissan Data Scan ver. 1.5) application. In actuality, any application that performs map tracing can use those values.

This is the basis of how it works,

- The ECU reads the engine rpm via the distributor camshaft sensor. It stores this value in RAM locations 3472 and 3473.
- The ECU takes the MAF air coming in, calculates an engine load (TP) value, and stores this value in RAM locations 31B1.
- The ECU then looks up a map table stored in ROM. For example, the fuel map or ignition map table.
- It locates the row in this ROM table where the value equals the rpm value in 3472 and 3473.
- It locates the column across this ROM table to locate the previously calculated TP value in 31B1.
- The point of intersection between the TP and RPM will contain a value to use for the fuel injection; and even for the ignition timing.
- If the values for the rpm and TP does not fall squarely within the map ROM cell, then the ECU will use an interpolation routine to calculate a value that is the closest value possible.

The art of ECU tuning takes these stored ROM values inside the ECU and optimizes them for a particular engine. The default values stored in there were a trade-off for the engine requirements in terms of performance, fuel economy, and emissions.



'94 Nissan Altima SE, 5spd.
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps, NGK Ignition wires.
ITEMS FOR SALE
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#5 Old 03-16-2008, 10:42 PM
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ok so thats great. I wonder if this can be applicable to a jwt tuned oem ecu...

so this is a monitory map, our tunning would still have to be based off of other parameters?
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#6 Old 03-17-2008, 04:04 AM
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Quote:
Originally Posted by drunkmunky View Post
ok so thats great. I wonder if this can be applicable to a jwt tuned oem ecu...

so this is a monitory map, our tunning would still have to be based off of other parameters?
This will apply to all ECUs. And yes, this is valuable to monitor so that you will know where to make adjustments for fuel or timing.



'94 Nissan Altima SE, 5spd.
Erebuni 905, Turboing, Hotshot CAI, UR Pulley, Calum ECU,
HUD & ATC retrofitted, DEPO lamps, NGK Ignition wires.
ITEMS FOR SALE
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