Specifications

Data Parameters Engine Parameters

RESONANCE FLAP INT. MANIF. ACTUAL

RESONANCE FLAP INTAKE PIPE ACTUAL

Range: ____________________________________________________ OPEN/CLOSED

RESONANCE FLAP INT. LINE NOM.

RESONANCE FLAP INT. MANIF. NOMINAL

RESONANCE FLAP INTAKE PIPE NOMINAL

Range: ______________________________________________________ not available

These parameters are used on ERE/EVE/ASF (IFI Diesel)) systems. They display the state of

the two resonance flaps for the air induction system: the intake line resonance flap (nominal) and

the intake manifold resonance flap (actual). The display should read OFF, flap closed, with the

engine running at low speeds (610-710). It should read OPEN at 1300-2800 and read open with

the engine running at high speeds (>2800).

When actuating the Inline Fuel Injection (IFI) accelerator greater than 50%, the intake line

resonance flap opens. The resonance intake manifold switch delivers a signal to the IFI control

module when the intake manifold resonance flap is completely open. The resonance intake pipe

switch delivers a signal when the intake line resonance flap is completely open.

The pneumatically controlled resonance flap is located on the intake manifold, and effectively

makes two different intake manifold lengths. At low engine speeds, resonance flap closed, air is

directed into the longer intake runners. This increases low-end torque by using the ram air effect.

At high engine speeds, resonance flap open, intake air is also feed into the short intake runners.

This increases the volume of air to meet the higher demands of the engine.

RI ACTUATOR ACT.VALUE POT.MTR R1

RI ACTUATOR ACT.VALUE POT.MTR R2

Range: ________________________________________________________ 0 to 5.00 V

Used on ME10 systems. These parameters display the ECU input signal voltage from the pedal

position and electronic throttle actuator sensors. This is a drive-by-wire system with no

mechanical throttle linkage. An electronic actuator controls the throttle valve under different

operating conditions to regulate idle speed, cruise control operation, driving on the basis of

accelerator position, traction control (Acceleration Slip Regulation), Electronic Stability Program

(ESP) and emergency running. The accelerator pedal position is detected by two potentiometers

that transmit input signals to the ECU. Based on these signals, the ECU controls the electronic

throttle actuator. One potentiometer is in the pedal value sensor and the other is in the electronic

actuator. The electronic throttle actuator supplies a reference value for a plausibility check. If one

of the potentiometers fails, the system switches over to the other one. A quick check is to add

both actuator signal readings (R1 and R2) together at various throttle positions. The two

readings should always add up the same value, usually between 4.5 to 4.9 volts.

RIGHT O2S (LAMBDA) CONTROL ACTIVE

Range: __________________________________________________________ YES/NO

Used on ME10 systems. This parameter indicates whether or not the system is operating in

closed loop and the ECU is responding to the right bank oxygen sensor (O2S) feedback signal.

The display reads YES when operating in closed loop, and NO when in open loop.

RIGHT O2S (LAMBDA) CONTROL AUTHORIZED

Range: __________________________________________________________ YES/NO

Used on ME10 systems. This parameter indicates whether or not the ECU is allowing closed

loop operation. The display reads YES when closed loop operation is allowed, and NO when the

ECU is holding the system in open loop.