Toyota Corolla (E120): Circuit description
Shifting from 1st to o/d is performed in combination with on and off of the shift solenoid valve s1 and s2 controlled by ecm. If an open or short circuit occurs in either of the solenoid valves, the ecm controls the remaining normal solenoid valve to allow the vehicle to be operated smoothly (fail safe function).
Fail safe function: if either of the solenoid valve circuits develops an open or short, the ecm turns the other solenoid valve on and off to shift to the gear positions shown in the table below. If both solenoids malfunction, hydraulic control cannot be performed electronically and must be done manually.
Manual shifting as shown in the above table must be done (in the case of a short circuit, the ecm stops sending current to the short circuited solenoid).
X: malfunctions
Monitor description
The ecm commands gearshift by turning the shift solenoid valves ”on/off”. When there is an open or short circuit in any shift solenoid valve circuit, the ecm detects the problem and the mil comes on. Illuminating the mil, the ecm performs the fail–safe and turns the other shift solenoid valves in good condition ”on/off” (in case of an open or short circuit, the ecm stops sending current to the circuit.).
Monitor strategy
Typical enabling condition
Typical malfunction thresholds
Component operating range
Wiring diagram
Other materials:
PDA (Proactive driving assist)
When a detectable object
is detected, the
proactive driving assist
operates the brakes and
steering wheel to help prevent
the vehicle from
approaching too close to
the object.
WARNING
■For safe use
Driving safely is solely the responsibility
of the driver.
The proactive driving assist is
design ...
Engine coolant
The coolant level is satisfactory if it is between the “F” and “L” lines on the
reservoir when the engine is cold.
1 Reservoir cap
2 “F” line
3 “L” line
If the level is on or below the “L” line, add coolant up to the “F” line.
■Coolant selection
Only use “To ...
Safety Connect
*: If equipped
Safety Connect is a subscription-
based telematics
service that uses Global
Positioning System (GPS)
data and embedded cellular
technology to provide
safety and security features
to subscribers. Safety Connect
is supported by Toyota's
designated response
center, which operates 24
hour ...