Motronic ME 7
ThrottleValve Control Module J338
The throttle valve control module combines the
following components:
Accelerator Pedal Module
• Throttle Drive (for Electronic Power Control [EPC])
G186
• Throttle Drive Angle Sensor 1 (for Electronic Power
Control [EPC]) G187
• Throttle Drive Angle Sensor 2 (for Electronic Power
Control [EPC]) G188
Auxiliary Signals
The throttle valve control module is controlled by
the ECM, and regulates the required air charge to
produce the required torque.
Operation
The twoThrottle Drive Angle Sensors (G187 and
G188) are opposite in resistance, and are used for
continuous cross checking by the ECM.
The angle sensors are provided with a 5V reference
voltage by the ECM. The ECM reads the voltage
drop across the dual potentiometers and uses this to
monitor throttle valve angle.
TheThrottle Drive for EPC G186 is an electric motor
that operates the throttle valve by way of a set of
reduction gears. Its position is continually monitored
by angle sensors G187 and G188.
Throttle Valve Control Module
8410_179
Malfunction Indicator
Lamp (MIL)
Substitute Function
In the case of a component failure, the ECM initiates
an “Emergency Running Mode” and allows only
limited vehicle operation. There is no substitute
function for the throttle drive.
G188
G187
On Board Diagnostic
The ECM is able to recognize range/performance
faults, as well as signal range checks for the angle
sensors. The G186 is monitored for range of operation
and idle adaptation faults.
0
100%
ThrottleValve Opening in %
8410_176
15
English 
