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Wiring Changes on the 2002-2005 IS300
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• Remove all BR (brown) grounds from manifold (pics 1 & 2). Connect them together if they're cut. Don't ground to engine!
• Find injector power on gray plug(pic 3), wire to Haltec injector relay pin87.
• Find ignition power also on gray plug, near INJ power(pic 4), wire to Haltech ignition relay pin87. Run a separate power wire from this power wire INTO Haltech pin A26.
• remove Toyota MAF, add 2 or 3 pin (I used a Haltech "GM Style" air intake temp. PN HT-010206). Add near TB inlet but away from heat.
• Optional: Disconnect OEM APPS and TB motor.
• Disconnect TPS pin 3. Leave disconnected.
• Replace R-Y wire (red w/ yellow stripe) on VVTi with B-R (black/red) (pics 5 & 6).
• Cam and Crank position sensors share a (-) signal, separate and wire each (-) individually.
• Connect all other sensors and output devices to the appropriate pins on the Elite 2500.
• Note: L-Y (Blue with Yellow stripe) on the IS300 is 5v supply from the ECU. This stays separate from all 12v power and will connect to the Elite 2500.
• Optional:Sever 5v (L-Y) power wire going to Vapor Pressure Sensor and reconnect to IS300 ECU if you're keeping your IS300 ECU to run in parallel
• Coolant temp sensor: Pull the Red wire from ECU pin (_) and connect to a Haltech Elite AVI (example: ). Your gauge cluster temp will not work anymore.
• Oil temp sensor:
• TPS sensor: