This kit provides all the components needed to install the TIP120/121/122 PWM idle valve modification on MegaSquirt V2.2 or V3.0 PCBs. It allows your ECU to drive high-current PWM idle valves directly and is ideal if you're not using the Relay Board’s on/off control or need full idle PWM support. Note: This mod is not required for PCB v3.57 or MS3-Pro ECUs, which support PWM idle control natively. Included Components: TIP120 / 121 / 122 transistor Mica insulator Heat sink compound 1N4001 flyback diode Mounting hardware V3.0 Installation Notes: Do NOT install the small Q4 transistor (from full kit); it’s not suitable for PWM idle valves. Mount the TIP transistor on: Spare spot on the heat sink (if available), OR Drill a hole in your case to use it as a heat sink. Use the included mica insulator and grease for thermal transfer. Jumper R39, and leave D8 and Q20 unpopulated. Install the 1N4001 flyback diode across the PWM idle valve terminals (banded end to 12V+). V2.2 Installation Notes: Replace Q5 with the TIP transistor. Mount on the case using included insulator and grease. No other modifications are necessary. Wiring: Without Relay Board: Idle valve hot wire → Switched 12V+ Ground wire → Pin 30 on MegaSquirt DB37 With Relay Board: Bypass the FIDLE relay with jumper (see guide). Idle valve hot wire → Switched 12V+ (e.g., Fuel Pump power) Ground wire → FIDLE terminal on the Relay Board This mod allows full control of your PWM idle valve with enhanced reliability and performance.
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