Plug-In ECU Installation Manual 11
© 2024 Link Engine Management Ltd
CAN & Expansion Cable Fitting
7. Fit the ECU back to the vehicle.
8. Connect the ECU to the factory wiring loom.
9. Do NOT attempt to start the vehicle. Proceed to read through the remaining sections of this manual
first.
1.4 Additional Sensors/Functions
Link Plug-In ECUs offer various options for the installation of additional sensors and devices. As a minimum it
is recommended that all ECUs are installed with a Manifold Absolute Pressure (MAP) sensor and Intake Air
Temperature (IAT) sensor. These parts can be purchased if required from your nearest Link dealer.
1.4.1
MAP Sensor
It is important that the pressure source for a MAP sensor be taken from a stable pressure source after the
throttle body. It is common to 'T' into the fuel pressure regulators pressure signal. Do NOT share this signal
with other devices such as boost gauges or blow off valves.
Note: Internal MAP Sensors on new plug-in ECUs have changed from 4Bar to 7Bar. The 7Bar versions should
be identifiable by a sticker on the bottom board and can also be confirmed by comparing MAP and BAP when
the MAP vacuum line isn't connected to see if they match with the calibration being used.
1.4.1.1 WRXLink (04), WRXLink (07) & WRXLink (11)
The Link G4X WRXLink (04), WRXLink (07) & WRXLink (11) plugins support several options for fitting of a
MAP sensor, any one of the following options can be used:
1. Factory MAP Sensor – From factory, all models supported by this ECU are fitted with a factory MAP
sensor. The factory MAP sensor is wired to An Volt 1. The factory sensor is good for 160kPa (23psi) of
boost.
2. Factory MAP Sensor Upgrade – The factory MAP sensor can be upgraded by simply replacing the factory
MAP sensor. Contact your nearest Link dealer for upgrade options.
Make sure that the correct MAP sensor input has been selected in PCLink and a MAP calibration has been
performed before attempting to start the vehicle.
Note: We have found two different MAP sensor calibrations used in the WRXLink (11). Most STI’s use the
“Subaru V9” calibration and the more basic WRX’s use the “Subaru V7-8” calibration. The correct selection
can be confirmed by checking that the BAP runtime matches the MAP runtime. See section 1.6.3
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