Engine Speed & Throttle Monitoring

The ECM constantly supplies the EAT ECU with information on engine speed and throttle angle through messages on the CAN bus. This information is used by the EAT ECU to calculate the correct timing of gear changes.

If the messages are not received from the ECM, the EAT ECU will implement a back-up strategy to protect the gearbox from damage, while allowing the vehicle to be driven.

In the event of an engine speed signal failure any of the following symptoms may be observed:

• Decrease in fuel economy.
• Increase in engine emissions.

In the event of a throttle position signal failure, any of the following symptoms may be observed:

• Harsh gear changes.
• No kickdown.
• Torque reduction request inhibited.