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DIYPNP
by DIYAutoTune.com
The Do It Yourself Plug-N-Play MegaSquirt EMS
you build from a simple kit.
Application Docs:
How to jumper and configure your DIYPNP to get your car fired up on
the first try
1995 - 1998 Nissan 240SX USDM 2.4L KA24DE MT
Test Vehicle Details:
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The vehicle used for drawing up these
application docs was a USDM 1996 Nissan 240SX KA24 with a manual transmission. All
factory electronics/ignition system components are in place and
the factory wiring harness is in perfect condition.
Other notes:
All stock sensors were used.
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What to buy:
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Required:
1-
DIYPNPJ88-K Kit. This is the main
DIYPNP Kit including the JAE style 64-pin connector
and all components, case, etc.
Optional:
1-
Tuning Cable This is
the same DB9 serial tuning cable used in other MegaSquirt
applications.
1-
USB Adapter This is
a DB9 serial to USB adapter. The adapter is needed when
the laptop or PC you are using does not have a built in DB9
serial port.
1-
StimPower This is a power supply
that is normally sold to power a stimulator, but another use is
it can be plugged directly into the DIYPNP mainboard to power
the ECU directly, allowing you to load the basemaps and do
limited testing on the ECU prior to installing the ECU in your
vehicle. It is particularly nice to be able to flash the
firmware and load your configuration on the bench instead of in
the vehicle, and allows for less risk of damaging something on
the vehicle due to incorrect settings.
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PNP_IAT-A or
PNP_IAT-S AFM/MAF Delete kit. This
is a simple kit with an IAT sensor, wire pigtail, crimp pins to
poke into the AFM Connector to run the signal back to the ECU,
and a steel or aluminum bung (hence the -A and -S in the part
numbers). Perfect for getting rid of a restrictive AFM/MAF
with your DIYPNP install.
What tools you'll need:
Soldering Iron, Solder, maybe some
desoldering braid in case you make a mistake. Small
phillips screwdriver. That's about it.
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Startup Maps
Base Configuration .msq files to help you
get your car fired up safely and quickly. Ready to
tune.
We're including these maps prior to
showing you how to jumper your DIYPNP up. There's a reason
for that. The base ignition settings contained in these
maps should be loaded on your DIYPNP before you power your car
up (with the key) with the DIYPNP installed. This is to
prevent damage to your ignition system in case the default
settings are not correct for your vehicle. Note that you can
power up the DIYPNP off the vehicle on a power supply connected
to the power jack next to the DB15 connector.
So here's our
recommendation-- After you complete basic assembly, Power
up your DIYPNP one of two ways. Either plug a
Stimulator Power Supply
into the front panel of the box (the easiest way),
or, start the Jumper Section below, but only connect the power
and ground wires to start with. That way you can plug the
DIYPNP into your factory wiring harness and safely power it from
your car. The third option, if you've fully assembled and
jumpered your DIYPNP already, is to unplug your coils from their
power connectors before plugging the DIYPNP into your factory
harness and powering it from there.
Then and only then,
you can flash the firmware on your DIYPNP to the MS2/Extra
firmware if you haven't already, and then load the startup map
provided to help you get your vehicle started.
Click Here to Download
Startup Maps for this Vehicle
Once the vehicle is
started, you will need to use the MS2/Extra manuals to set the
base timing and begin to tune the vehicle! This is
critical! Do not drive an untuned vehicle!
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DIYPNP Jumper Configuration
This section will cover the standard,
basic jumper configuration required to get the vehicle
running using your DIYPNP.
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Vehicle information |
System Information |
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Market: |
USDM |
DIYPNP v1.5 |
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Make: |
Nissan |
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Model: |
Sentra |
Code Version: |
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Year: |
1996 |
MS2Extra 3.1.0 |
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Engine: |
KA24DE |
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Tranny: |
Manual |
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Trim: |
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Edge Pin Connections |
Pull Ups |
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Ignition Settings |
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Main |
Adapter |
Connection |
Resistance |
Voltage |
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Spark Mode |
Basic Trigger |
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IAT |
28 |
ALED |
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Trigger Angle |
112
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CLT |
51 |
WLED |
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Main/Return |
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TPS SIG |
23 |
OPTO+ |
470 ohm |
12v |
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Oddfire Angle |
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O2 SENSOR |
46
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VR2 |
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GM HEI/DIS |
Off |
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VR IN + |
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IAC |
FB Diode |
Banded end to 12V |
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Use Cam Signal |
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VR IN - |
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High Current Drivers |
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Ignition Input Capture |
Falling Edge |
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OPTO IN + |
40
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Output |
Enabled |
To Pin |
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Spark Output |
Going High (Inverted) |
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OPTO IN - |
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S1 |
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Number of Coils |
Single Coil |
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VR2 IN + |
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S2 |
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Dwell type |
Standard Dwell |
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IAC |
101 |
S3 |
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Cranking Dwell |
4 |
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TACH OUT |
3
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S4 |
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Cranking Advance |
10 |
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FUEL PUMP |
8
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Knock Circuit |
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Maximum Dwell |
3.1 |
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INJ1 |
102, 109 |
Enabled |
Sensor + |
Sensor - |
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Maximum Spark Duration |
0.7 |
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INJ2 |
104, 107 |
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Spark Hardware Latency |
20 |
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12V |
56
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I/O Circuits |
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Trigger wheel teeth |
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12V |
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Input From |
Out Pin To |
Purpose |
Missing teeth |
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12V |
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Relay 1 |
36 |
4 |
ECCS Relay |
Tooth #1 angle |
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VREF |
49
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Relay 2 |
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Wheel speed |
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5V |
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Boost |
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Second trigger active on |
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SG |
50 |
Input 1 |
12 |
15 |
A/C Relay |
and every rotation of |
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SG |
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Input 2 |
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Notes |
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GND |
10, 19
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GND |
39, 43
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Misc Jumpers |
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GND |
106, 112
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On |
Off |
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GND |
118 |
OPTO GND |
X |
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GND |
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BL/TH |
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X |
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IGN1 |
1 |
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IGN2 |
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WLED |
14 - L
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ALED |
13 - H
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Other Changes/Considerations
This section will cover changes that need to be made
to the DIYPNP that go beyond the standard I/O jumpering, such as intake
valve butterfly activation, on/off VVT activation, or other
customizations to address the specific needs of a vehicle.
A/C Controls
In the Jumper Notes above we've included jumpers for
A/C clutch and fan activation using the 'Input 1' circuit.
The Input for the AC system comes in from the A/C switch on
ConnectorBoard pin 41. The output of the "Input 1" circuit
gets jumpered to both 9 and 11 on the ConnectorBoard.
These two pins will activate the A/C compressor clutch relay and
the A/C condensor fan relay. You will need to leave R14
out of this circuit or cut out R14 if you installed it.
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Sensor Calibration
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This vehicle does have a variable TPS.
You should calibrate it properly from TunerStudio in the
'Tools' menu. Choose 'Calibrate TPS'.
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Make sure the engine is off, and
the key is on.
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With your foot off of the throttle,
click the 'Closed Throttle ADC Count - GET CURRENT'
Button.
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Put the throttle to the floor.
With your foot fully depressing the throttle, click the
'Full Throttle ADC Count - GET CURRENT' Button.
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Click Close.
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Calibrate your CLT Sensor and IAT
Sensor.
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Again from TunerStudio, click
'Tools > Calibrate Thermistor Tables'. Make
sure 'Coolant Temperature Sensor' is selected at the
top.
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Enter these values, and click
'Write to Controller'.
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Now you'll do the same for the
IAT. Select 'Intake Temperature Sensor' at the
top in the drop down box.
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Enter these values, and click
'Write to Controller'. Now click Close to Exit.
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Finally, you should calibrate your O2
Sensor to the ECU. To do this, click 'Tools >
Calibrate AFR Table'.
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Choose your O2 Sensor from the
list. Choose Narrowband for the stock O2
Sensor. Or select your wideband and the proper
configuration of said wideband from the drop-down
list.
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Click 'Write to Controller'.
Once finished writing, click 'Close'.
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Deleting the MAF
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The DIYPNP allows you to disconnect the Mass
Air Flow meter since it is not used in the fuel load
calculation. When you remove the MAF, you will want to tape up
the connector to protect it inside and out if you ever plan to
re-use it. The stock intake air temp sensor is not located
inside the air meter so there are no wiring changes to be made.
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Intake Air Temp Sensor: If you
plan to install a turbo
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The stock IAT sensor and location will not be
adequate if you decide to run a turbo or supercharger. For
best results, you will want an air-tight seal with the sensor
placed in the intercooler piping, after the intercooler and
before the throttle body. The temperature of the air as it
enters the engine (not the turbo or supercharger) is what the
ECU needs to know. We offer an IAT kit (sensor and weld-in
bung) for either
steel or
aluminum
piping.
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Read the Manuals, You are Responsible for your own
results!
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This Application Doc is intended to assist
you in your DIYPNP DIY EFI Installation. We've done a fair
amount of research, and actually tested on a similar vehicle to
help ensure we can provide the most accurate information
possible to make your installation go as smoothly as possible.
That said, there are certain things you could do incorrectly, or
certain things you could change up, that could cause you to run
into issues. Our tech support department will be glad to
assist you working through any issues you might have, please
contact us and give us that opportunity and we should be able to
work things out for you.
Startup Maps included/attached to this
Application Doc is intended only to help you get your engine
started so that you can properly tune your engine. The map
will be setup properly for a stock vehicle matching the
year/make/model/trim in the 'Test Vehicle Details' section at
the top of this page. If you have made any changes to your
wiring, your ignition system, or other related components, this
map may not be ideal for your vehicle. You will then need
to check and confirm the appropriate settings and properly
configure your DIYPNP EMS for your altered vehicle. Some
maps offered may be more completely tuned that others, some may
be just setup enough to get the car to fire up and idle with a
little help from the throttle. That's when the tuning
begins.
In short-- We've provided you with the
building blocks for an incredible EMS. You are however
responsible for the implementation and your own successes or
lack thereof, but rest assured that we're here for you and we're
going to do everything in our power to make sure your project is
a success.
For more information on configuring and
tuning your DIYPNP EMS, and for information on adding and tuning
custom MS2/Extra features, read up at
http://www.msextra.com/ms2extra/. In fact, everyone
implementing this system should read that manual from front to
back if you really want to harness the power of the DIYPNP EMS.
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We'd love to hear your feedback on our DIYPNP
Application Docs.
Click Here to offer feedback/suggestions!
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