Starting system

Starting system

When the starter switch is turned to the crank position, battery voltage is switched via fuse C8 in the passenger compartment fuse box to one side of the starter relay coil on a WR-WK wire. The other side of the coil is earthed differently dependent on model :

MPI Manual vehicles receive an earth from the alarm ECU on a WR wire; Automatic vehicles receive an earth on a WLG wire via the automatic inhibitor switch from the alarm ECU on a WR wire.

SPI Manual vehicles are earthed directly on a B wire; Automatic vehicles are earthed on a WLG wire via the automatic inhibitor switch and a B wire. When the starter relay is energised, battery voltage on an N wire from link 4 in the engine compartment fuse box is switched to the starter motor solenoid on an NR wire. Since the other side of the starter relay is connected to earth, the starter solenoid energises and applies direct battery voltage on an R wire (MPI only) or a B wire (SPI only) to the starter motor. Earth to the starter motor is via the mountings.