Toyota COROLLA2004 Electrical Wiring Diagram page 145

System Outline
Previous automatic transaxle have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock–up hydraulic pressure. The electronically controlled transmission, however, controls
the line pressure and lock–up pressure etc. electrically, through the solenoid valve. The engine control module controls each
solenoid valve based on the input signals from each sensor, which makes smooth driving possible by shift selection for each
gear that is most appropriate to the driving conditions at that time.
1. Gear Shift Operation
During driving, the engine control module selects the shift for each gear which is most appropriate to the driving conditions,
based on input signals from the engine coolant temp. sensor to TERMINAL THW of the engine control module, and also the
input signals to TERMINAL SPD of the engine control module from the vehicle speed sensor devoted to the electronically
controlled transmission. Current is then output to the electronically controlled transmission solenoid. When shifting to 1st
speed, the current flows from TERMINAL S1 of the engine control module to TERMINAL 3 of the solenoid to GROUND, and
from TERMINAL S2 of the engine control module to TERMINAL 6 of the electronically controlled transmission solenoid to
GROUND, and continuity to the No.1 and No.2 solenoid causes the shift.
For 2nd speed, the current flows from TERMINAL S1 of the engine control module to TERMINAL 3 of the solenoid to
GROUND, and from TERMINAL S2 of the engine control module to TERMINAL 6 of the solenoid to GROUND, and
continuity to solenoids No.1 and No.2 causes the shift.
For 3rd speed, there is no continuity to No. 1 solenoid, only to No. 2, causing the shift.
Shifting into 4th speed (Overdrive) takes place when there is no continuity to both No.1 and No.2 solenoid.
2. Stop Light SW Circuit
If the brake pedal is depressed (Stop light SW on ) when driving in lock–up condition, a signal is input to TERMINAL STP of
the engine control module, the engine control module operates and continuity to the lock–up solenoid is cut.
3. Overdrive Circuit
∗ Overdrive on
When the engine is turned on from ignition off, the engine control module turns the O/D on. When the O/D main SW is
pushed while the O/D is off, a signal is input into TERMINAL ODMS of the engine control module, and the O/D is turned
on by the engine control module. In this case, the engine control module controls the gear shift according to the vehicle's
driving condition, using the O/D range. At this time, the O/D off indicator light is off.
∗ Overdrive off
When the O/D main SW is pushed while the O/D is on, a signal is input into TERMINAL ODMS of the engine control
module, and the O/D is turned off. At this time, the current flows through the O/D off indicator light to TERMINAL ODLP of
the engine control module. As a result, the O/D off indicator light turns on, and the engine control module controls the gear
shift according to the vehicle's driving condition, without using the O/D range.
Service Hints
E3 (A), E4 (B), E5 (C), E6 (D) Engine Control Module
S1, S2–E1 : 9.0–14.0 volts with the ignition SW on and the solenoid on
0–1.5 volts with the ignition SW on and the solenoid off
L–E1 : 7.5–14.0 volts with the ignition SW on and the shift lever at L position
2–E1 : 7.5–14.0 volts with the ignition SW on and the shift lever at 2 position
R–E1 : 7.5–14.0 volts with the ignition SW on and the shift lever at R position
STP–E1 : 9.0–14.0 volts with the brake pedal depressed
THW–E2 : 0.2–1.0 volts with the engine coolant temp. 60°C (140°F) –120°C (248°F) and engine idling
VTA–E2 : 0.3–0.8 volts with the ignition SW on and the throttle valve fully closed
3.2–4.9 volts with the ignition SW on and the throttle valve fully open
VC–E2 : 4.5–5.5 volts with the ignition SW on
ODMS–E1 : 9.0–14.0 volts with the ignition SW on
0–3.0 volts with the ignition SW on and press continuously the O/D main SW
+B–E1 : 9.0–14.0 volts with the ignition SW on
ODLP–E1 : Approx. 12 volts with the ignition SW on and the O/D main SW turned off
A2 A/T Shift Lever Position SW
3–2 : Closed with the shift lever in R position
3–4 : Closed with the shift lever in 2 position
3–8 : Closed with the shift lever in L position
2004 COROLLA (EWD533U)
145