Gearbox Interface Unit (GIU) (Automatic gearbox - EM-CVT)

When the transmission is in any position other than the Park (P) or Neutral (N) positions, the switch interrupts the starter relay coil earth path to the alarm ECU preventing starter operation. This signal is also used by the ECM to adjust the stepper motor of the IAC valve to adjust the engine idle speed when Reverse (R) or Drive (D) is selected.

When Reverse (R) is selected, the switch moves to its second position and activates the reverse lamps.

In selected markets, when the selector lever is in the ’P’ position and the ignition is switched on, the park/neutral switch input causes the GIU to energise a shift lock solenoid on the selector lever. This locks the lever in the ’P’ position. The selector lever cannot be moved from the ’P’ position until the ignition is switched on and the footbrake is applied. The shift lock solenoid is only active when the ignition is on.

Road speed transducer

The road speed transducer is located on the rear face of the gearbox, above the RH drive shaft, adjacent to the gearbox differential speed sensor. The transducer is used by the instrument pack for speedometer drive, the Electronic Power Assisted Steering (EPAS) system and the ECM. See INSTRUMENTS, Information. See STEERING, Information.

Gearbox Interface Unit (GIU)

1. Harness connector
2. GIU
3. Mounting nut (2 off)
4. GIU fuse (10A)