Emergency Override System Control Unit, Basic Function - GF54.21-P-9810A

Engine All In Model All

With Code JP2 (Emergency jumper switch)

Fig 1: Emergency Override System Control Unit Components Location - Engine All In Model All With Code JP2 (Shown On Model 464)

Courtesy of MERCEDES-BENZ USA

Emergency override system control unit, shown on Model 464

Overview

This document contains information on:

General
Function

General

The emergency override system control unit (1) controls the emergency override system (EOSys) and can be activated as a preventive measure and in the event of a fault. When activated, the emergency override system control unit (1) ensures engine running even if there is severe damage to the drive system, up to mechanical failure.

Function

The emergency override system can be activated using a tamper-proof switch (emergency override system button) in the center switch panel.

The emergency override system control unit (1) is integrated in the drivetrain between the drivetrain control unit and the following control units:

Engine management control unit
Fuel pump control unit
Fully integrated transmission control electric controller unit

When activated, the emergency override system control unit (1) reads in predefined signals that could have a critical impact on engine running (e.g. overheating or lack of lubricant) and may lead to operational restrictions. If a critical signal is detected by the emergency override system control unit (1), this signal is edited and forwarded accordingly so that continued driving can be guaranteed even with the risk of potential damage to the drivetrain.

	Component descriptions
	Emergency override system control unit, component description	Model 464	GF54.21-P-9985J