07 · Wiring
VVT, pump, fan & spare
Two dedicated high-current low-sides plus four half-bridges. Roles are assignable — fuel pump, fan, boost, VVT, stepper.
Dedicated low-sides
L2 is Low-side 1, M2 is Low-side 2. Typical: VVT and idle, or dual VVT. Solenoid 12 V from the main relay.
Fuel pump and fan
Typical assignment is GP Out 1 (D2) for the fuel-pump relay and GP Out 2 (D3) for the fan relay. Relay coils only. Pump power on its own 15–20 A fused feed. Firmware primes on key-on.
GPO 5 and GPO 6
J3 and J4 are push-pull logic. On a 4-cylinder they are free for tach, shift light or an extra coil. On a 6-cylinder they share the 3-channel matched injector driver with K1. On an 8-cylinder they trigger the two-channel injector driver. Do not double-assign them.
Stepper idle
Bipolar stepper idle valves can use the four half-bridges (D4, D3, D2, B2) as two coils. Unipolar (5-wire / 6-wire) steppers are not supported. DBW cars should not also run a stepper.