Toyota Tacoma manuals

Toyota Corolla Repair Manual: 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

X: malfunctions

Monitor description

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 failsafe 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 enabling condition

Typical malfunction thresholds

Typical malfunction thresholds

Component operating range

Component operating range

Wiring diagram

Wiring diagram

Inspection procedure

Shift solenoid a control circuit low/high
Dtc p0973 shift solenoid a control circuit low (shift solenoid valve s1) Dtc p0974 shift solenoid a control circuit high (shift solenoid valve s1) ...

Inspection procedure
1 Inspect transmission wire(s1) Disconnect the transmission wire connector from the transaxle.  measure the resistance according to the value(s) in the table below. Standard: ...

Other materials:

Precheck
1. Selecting compass display mode  the compass switch allows you to select the display or nondisplay mode of the compass. 2. Setting zone  deviation between the magnetic north and actual north differs depending on the location. Therefore, adjustment of the magnetism ...

Engine
Onvehicle inspection Hint: inspect these items on a cooled down engine. 1. Inspect drive belt 2. Replace spark plugs 3. Inspect air filter Remove the air filter.  visually check that the air filter is not excessively damaged, dirty or oily. Peplace the air filter if necess ...

Center stop lamp assy
Replacement 1. Remove package tray trim panel assy (w/o rear spoiler) 2. Remove center stop lamp assy (w/o rear spoiler) Remove the center stop light assy as shown in the illustlation. 3. Remove center stop lamp assy (w/ rear spoiler) Remove the 2 screws.  disconnect th ...

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