400E (124.034) V8-4.2L (119.975) (1992)
/v8-4.2l_(119.975)/Page-1369005.png)
control unit compares the signals and specifies the position of the throttle valve via the output signal. This signal is used by the electronic
accelerator actuator to adjust the throttle valve.
Before starting the engine, the throttle valve position is determined by the engine temperature. Once the engine is running, the idle speed and
ABS/ASR III are controlled by the electronic accelerator control unit which provides a constant idle RPM and limits the maximum torque output
to the drive wheels. For torque output regulation (ABS/ASR III), the control unit uses the input signal from the ABS/ASR control unit.
The electronic accelerator control unit uses the following information to determine the throttle position:
Input signals
^
Base module (N16/1)
^
ABS/ASR control unit (N30/1)
^
LH control unit (N3/1)
^
Idle speed contact switch (S29/3)
^
Electronic accelerator actuator (M16/1 with throttle valve)
^
Stop lamp switch (S9/1)
^
Starter lockout/backup lamp switch, selector lever position recognition (S16/3)
^
Cruise control switch (S40)
^
A/C compressor engagement signal
^
Data exchange via controller area network (CAN)
^
Wheel speed sensors (L6/1 - L6/4)
Output signals
^
Electronic accelerator actuator (M16/1 with throttle valve)
^
ABS/ASR control unit (N30/1)
^
LH control unit (N3/1)
^
EZL/AKR ignition control unit (N1/3)
^
Impulse readout (malfunction memory) via 38-pole diagnostic socket (X11/4)
^
Data exchange via controller area network (CAN)
Idle speed control function
The idle speed control function uses the following information to determine the correct idle speed:
^
Engine speed (TN-signal)
^
Coolant temperature
^
Vehicle speed signal
^
Selector lever position
^
A/C compressor engagement signal
Idle Speed/Temperature Chart
During idle, the control unit keeps the engine speed at a constant RPM depending on engine coolant temperature.
