DESCRIPTION AND OPERATION
RANGE ROVER 4.41
ECM Relay
The ECM (C0604) provides an earth path for the ECM relay coil (C1895) on an N wire. The
energised relay (C1895) provides a feed to fuse 2 of the engine compartment fuse box
(C0570) on an RW wire. Fuse 2 (C0570) is connected to the EAT ECU (C0932) by a pair of
RU wires.
For more details on ECM relay operation, refer to the Engine Management System – Td6
section of the System Description and Operation Workshop Manual.
EAT ECU
The EAT ECU controls operation of the transmission via the following:
Pressure Regulator Solenoid
The EAT ECU (C1835) provides a Pulse Width Modulated (PWM) signal to the pressure
regulator solenoid (C0244) on a P wire. This enables the pressure regulator solenoid (in
conjunction with the pressure regulator valve) to control line pressure supplied to the
clutches and shift control valves. The EAT ECU (C1835) provides an earth path for the
pressure regulator solenoid (C0244) on an R wire.
Torque Converter Clutch (TCC) Solenoid
The EAT ECU (C1835) provides a PWM signal to the TCC solenoid (C0244) on a G wire.
The TCC solenoid is a normally closed solenoid, and controls the output fluid pressure to
the torque converter clutch. The EAT ECU (C1835) provides an earth path for the TCC
solenoid (C0244) on a BY wire.
Shift Control Solenoids
The EAT ECU (C1835) provides a PWM signal to the three identical shift control solenoids
(C0244) on a G wire. The EAT ECU (C1835) provides an earth path for solenoid A (C0244)
on an OB wire, solenoid B (C0244) on a GR wire, and solenoid C (C0244) on a Y wire. For
details of solenoid opening and closing, refer to the Automatic Transmission – GM 5L40–
E section of the System Description and Operation Workshop manual.
Input Shaft Speed Sensor
The EAT ECU (C1835) provides a feed to the input shaft speed sensor (C0244) on a U wire.
The input shaft speed sensor (C0244) returns an ac voltage pulse back to the EAT ECU
(C1835) on an O wire. By measuring the peak to peak voltage of the voltage wave form, the
EAT ECU can determine the speed of the input shaft.
Output Shaft Speed Sensor
The EAT ECU (C1835) provides a feed to the output shaft speed sensor (C0244) on a W
wire. The output shaft speed sensor (C0244) returns an ac voltage pulse back to the EAT
ECU (C1835) on an N wire. By measuring the peak to peak voltage of the voltage wave form,
the EAT ECU can determine the speed of the output shaft.
To Next Page
Loading...
