Jump to: Installation | Software | I/O Configuration | Jumper Matrix | Rear Options Connector
ECU Model / Vehicle Specific Installation Guide
Vehicle Fitment:
- 1989-1994 240SX w/ KA24DE - Manual Transmission
Please read all documentation before installing your AMP Plug-N-Play ECU and verify that you’ve followed all steps before starting your engine for the first time.
Physical Installation
All you’ll need for a successful installation are some basic hand tools. No cutting or drilling of the original sheet metal or bracketry is required.
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Disconnect the negative battery cable
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Remove the Kick Panel
Using a Trim Removal Tool, remove the kick panel push-pin in the bottom-left corner of the panel. Optionally, remove the door sill to make easier removal of the kick panel. Then, gently pull on the kick panel that is held by two push-pins.
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Disconnect the Main ECU Connector & Remove Factory ECU
The ECU harness is held in the ECU by the large bolt in the center of the connector. Using a 10mm Socket & Ratchet loosen the bolt in the center of the harness until the harness comes out of the ECU. The bolt will remain in the ECU connector and will not come out completely. Finally, Remove the 6mm ECU mounting bracket bolts securing the ECU to the body.
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Route the Vacuum Line through the firewall
The vacuum hose can be passed through a grommet in the firewall through which the air conditioning lines pass. From the engine bay side of the fire wall on the passenger side, work a couple inches of hose through the lower right corner of the grommet. Be sure the vacuum line is routed without kinks or pinching.
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Wiring the Rear Options Connector
This is the time to wire in your wideband along with completing any optional wiring you plan to use through the Rear Options Connector. This is the best time to wire additional sensors, inputs, outputs, speed inputs, or ignition upgrades, since the connector is easier to access before the ECU is mounted in the vehicle.
Internal Wideband ECU Models
If you selected the Internal Wideband ECU model, connect the provided wideband sensor cable to the rear options connector as instructed in the pinout section. This allows the wideband sensor to plug directly into the ECU without using a separate external wideband controller.
No Wideband ECU Models / External Wideband Setups
If you selected the No Wideband ECU model, or if you are using an external wideband controller, wire the external wideband controller signal to the appropriate rear options connector input. Click Here: Wiring a Wideband ControllerAdditional Inputs and Outputs
We also recommend wiring any other planned sensors or accessories at this time, including additional analog inputs, digital inputs, speed inputs, or outputs. This helps avoid removing or accessing the ECU later as your setup expands. Once your wiring is complete, plug the rear options connector into the ECU until it clicks into place and neatly secure the wiring. Refer to the Rear Options Connector section for pinout details and available functions.
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Connect the supplied Tuning Cable
Attach the provided tuning cable to the ECU and tighten the collar clockwise until snug with your fingers. Be sure the pins are aligned properly before tightening.
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Install the AMP Play-N-Play ECU
Installation is the reverse of removal. Slide the ECU in the factory location and secure it using the mounting holes on the AMP PNP ECU. -
Connect the Vacuum Line to the ECU
After the ECU is mounted, connect the vacuum line the was done on Steps 5/6 to the vacuum port on the ECU. The vacuum port nipple is located on the right-side of the ECU.
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Install the AMP Play-N-Play ECU & Reconnect the Main Harness
Installation is the reverse of removal. Slide the ECU in the factory location and secure it using the mounting holes on the AMP PNP ECU. Reconnect the main harness to the ECU using the 10mm socket. Tighten until the connector is fully seated into the ECU.
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Reinstall the Kick Panel and Door Sill
Reinstall the foot well kick panel and secure into place with the previously removed retention pin. Reinstall the door sill trim. Light tapping with a rubber mallet may be necessary to properly seat it. Reconnect the Negative Battery Cable. -
Mass Air Flow Meter Removal
The preloaded base tune on your AMP Plug-N-Play ECU is configured for Speed Density, which is how most customers choose to tune these applications. Because of this, the factory mass air flow meter is no longer required and can be removed from the vehicle. If you are not removing the MAF Sensor you must UNPLUG the sensor.
Software
Tuning Software Installation & Setup
Before starting the vehicle, install TunerStudio on your laptop and connect to your AMP Plug-N-Play ECU using the supplied tuning cable. Open TunerStudio, create a new project for the ECU. Once connected, confirm that TunerStudio shows the ECU as Online and that communication is working properly before making any changes.
View Tuning Software Installation & Setup Instructions →
Initial Configuration
Your AMP Plug-N-Play ECU includes a base tune that is configured for a stock application. If your vehicle has any changes from stock, you should review and update the tune BEFORE STARTING THE VEHICLE.
Examples of settings that may need to be reviewed or updated include:
- Engine Size
- Injector Size
- Wideband Controller
Confirm that all required settings match the components installed on your vehicle before proceeding with startup and timing verification.
View Initial Configuration Instructions →
Verifying Base Timing
Now with your new ECU installed, you must verify that the timing commanded by the ECU matches the timing the engine is actually receiving. Improper ignition advance can cause engine damage if it is not checked.
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Connect a timing light to Cylinder #1
Use caution, as secondary ignition voltage can be extremely high. Make sure the timing light leads are routed safely away from moving parts and hot engine components. -
Connect your laptop to the ECU and start the vehicle
Open the tuning software (TunerStudio) and your vehicle’s project. Start the vehicle and confirm that the ECU shows Online. -
Set the ECU to fixed timing
In TunerStudio, go to Ignition Settings > Ignition Options / Wheel Decoder. Under Fixed Advance, select Fixed Timing. Set Timing for Fixed Advance (degrees) to 10.0 degrees, then click Burn.
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Check timing with the timing light
Use the timing light to confirm that the engine is seeing 10 degrees of timing. If you have a single mark on your crank pulley, align it with the “10” on the indicator dial. If you have two marks, align the left most mark will align with “10” on the indicator dial and the right mark will align with “T”. If you have more timing, decrease the “Tooth #1 Angle” (green box above). If you have less, increase this value.
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Set the ECU back to Use Table
Once the timing is correct, change Fixed Advance back to Use Table, click Burn, and cycle ECU power by turning the vehicle off and back on.
Tuning
Congratulations, you have completed the physical installation, software setup, and initial configuration of your new AMP Plug-N-Play ECU. Your ECU is now ready, and you can begin tuning the vehicle.
Base Tune
Your AMP Plug-N-Play ECU is preloaded with a base tune for the specific ECU model and vehicle application it was built for. This provides a proper starting point for initial startup and tuning. If you ever need to restore the original base tune to the ECU, you can download it from our Firmware & Base Tunes page.
I/O Configuration
Below is a breakdown of the I/O usage for your AMP Plug-N-Play ECU. This identifies the default pin assignments for your specific vehicle, allowing you to see which inputs and outputs are already being used for factory functions and why those pins may not be available for use in the tune.
ECU Internal Jumper Matrix
Below is a diagram and overview of the available internal jumpers and their functions. To access the jumpers, remove the (4) screws from the top cover of the ECU.
JP2: Fan and AC Relay Configuration
Used in some models. See diagram.
Default Setting: Jumpered Pin 2 & 3
JP3: Boost Control Output
Used to signal boost control solenoid via HC1 on ECU Pin 102, generally in S14 models.
Default Setting: Not Jumpered
JP4: VCT Output
Used to signal VCT solenoid via PWM4 on ECU Pin 114 on some models, generally S14.
Default Setting: Not Jumpered
JP5: VCT Output
Used to signal VCT solenoid via PWM on ECU Pin 105 on some models, generally S15
Default Setting: Not Jumpered
JP6: Pin 8 Configuration
Used to route either Spark B for Cylinder 3 COP signal or PWM5 for Low Fan to ECU Pin 8 for S13 SR or S15 applications, respectively.
Default Setting: Not Jumpered
JP7: Pin 2 Configuration
Used to route either Spark D for Cylinder 2 COP signal or Tachometer Out for tach control, based on model. See diagram.
Default Setting: Jumpered Pins 2 & 3
JP8: Spark B Output
Used to signal Spark B for Cylinder 3 COP on ECU Pin 5 on S14 and S15 applications.
Default Setting: Not Jumpered
JP9: Pins 106, 9, 11 Configuration
Configures multiple pins based on application for AC, cooling fan, and ignition output. See diagram.
Default Setting: Jumpered Pin Pairs 1 & 2
JP10: VCT Output
Used to signal VCT solenoid on ECU Pin 12 for some applications.
Default Setting: Not Jumpered
JP11: Spark C Output
Used to signal Spark C for Cylinder 4 COP signal on S14 and S15 applications.
Default Setting: Not Jumpered
JP12: Pin 16 Configuration
Used to select MAF or IAT function for ECU Pin 16.
Default Setting: Jumpered Pins 2 & 3
JP1: EECS Relay Bypass Jumper
This jumper is used for diagnostic test purposes with suspected ECCS (Main) Relay failure. When the jumper is applied and Ignition Switch is turned ON, the ECU routes 12V+ around a failed ECCS Relay, allowing the engine to run.
Note: that this is intended for diagnostics use only and the EECS relay must be replaced if failed before tuning or racing occurs.
Default Setting: Not Jumpered
Rear Options Connector
Your ECU includes a bag containing (2) connector housings and (2) banded sets of pre-terminated wires. One set of wires is intended for the larger openings in the connector, and the other set is intended for the smaller openings. Reference the pinout below for available rear options connector functions and wiring locations.
Important: The pinout diagram below is shown from the back of the connector.
Printable Copy of Rear Options Connector
