Hondata's warranty will not cover damage to the ECU and/or programmable ECU circuit board from the use of low impedance injectors, non-resistor spark plugs and/or incorrect engine ground location.
Injector Impedance
The Honda ECU is designed to use high impedance (or 'saturated') injectors. The use of low impedance (or 'peak and hold') injectors will damage the ECU and/or vehicle wiring. Low impedance injectors can be used with the addition of a resistor box, but it is recommended to use high impedance injectors if at all possible.
Non-Resistor Spark Plugs
Do not use non-resistor spark plugs. Non-resistor spark plugs cause a large amount of electrical interference which may affect vehicle electronics, including the ECU.
Engine Ground
It is very important that the ground from the wiring harness to the engine (G101) makes good electrical contact with the cylinder head. Otherwise the return path for the sensors, ignition and VTEC may be through the ECU case to the vehicle body, which may damage the ECU and/or programmable board inside the ECU.
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The recommended position for the engine ground is on the stud attached to the cylinder head. While the stock location on the intake manifold will usually work without problems, the stud on the cylinder head provides a better electrical connection. The top bolt holding the radiator water output to the cylinder head is also a good alternative for the ground wire.
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Installation - please follow the installation steps in the correct order.
1. Install the KManager software from the installation CD (see Installing KManager software).
2. Install the USB drivers (for Windows XP or Windows Vista).
3. Install the ECU (see Installing the ECU in the Vehicle).
4. Upload a base calibration into the ECU (see Uploading calibrations to the ECU).
If you have any problems refer to USB troubleshooting