Fault Mode

When the EMS 2000 or GIU detects a fault, the EMS 2000 will try to position the ratio control motor so that the engine speed in most driving conditions is around 2800-3200 rpm. In this position the vehicle still has reasonable driving characteristics. For certain failure modes, where the EMS 2000 cannot command the position of the motor, the GIU will set the motor position to 130 steps (full range of travel is 0-214 steps). In this case, the engine speed in most driving conditions will be 3750-4000 rpm.

The EMS 2000 will instruct the instrument cluster to display 'EP', or the Engine MIL depending on legislative requirements. There are certain faults that when stored will not cause the EMS 2000 to default the transmission into its limp home position.

These are:

• Gear lever + switch failure.
• Gear lever - failure.
• Steering wheel + switch failure (if fitted).
• Steering wheel - switch failure (if fitted).
• Shift interlock system fault.
• Center Console LED fault.

A gearbox default is not necessary for these failures because the control of the gearbox is not compromised; it is only necessary to warn the driver. The EMS 2000 will not operate the sequential gear changes in manual mode if these switches are faulty.