Toyota RAV4 manuals

Toyota Sienna Service Manual: Definition of terms

Term Definition
Monitor description Description of what the ecm monitors and how it detects malfunctions (monitoring purpose and its details).
Related dtcs Diagnostic codeV
Typical enabling condition Preconditions that allow the ecm to detect malfunctions.

With all preconditions satisfied, the ecm sets the dtc when the monitored value(s) exceeds the malfunction threshold(s).

Sequence of operation The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction.

While another sensor is being monitored, the next sensor or component will not be monitored until the previous monitoring has concluded.

Required sensor/components The sensors and components that are used by the ecm to detect malfunctions.
Frequency of operation The number of times that the ecm checks for malfunctions per driving cycle.

"Once per driving cycle" means that the ecm detects malfunction only one time during a single driving cycle.

"Continuous" means that the ecm detects malfunction every time when enabling condition is met.

Duration The minimum time that the ecm must sense a continuous deviation in the monitored value(s) before setting a dtc. This timing begins after the "typical enabling conditions" are met.
Malfunction thresholds Beyond this value, the ecm will conclude that there is a malfunction and set a dtc.
MIL operation Mil illumination timing after a defect is detected.

"Immediately" means that the ecm illuminates mil the instant the ecm determines that there is a malfunction.

"2 Driving cycle" means that the ecm illuminates mil if the same malfunction is detected again in the 2nd driving cycle.

Component operating range Normal operation range of sensors and solenoids under normal driving conditions.

Use these ranges as a reference.

They cannot be used to judge if a sensor or solenoid is defective or not.V

Parts location

Parts location

System diagram

The configuration of the electronic control system in the U151E automatic transaxles is as shown in the following chart.

System diagram

Precaution
NOTICE: Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM (See page AX-16). Perform the REGISTRATION (VIN regi ...

System description
1. SYSTEM DESCRIPTION (a) The ECT (Electronic controlled automatic transmission/transaxle) is an automatic transmission/transaxle that electronically controls shift timing using the ECM. The ECM d ...

Other materials:

Differential oil
Adjustment 1. INSPECT DIFFERENTIAL OIL (a) Stop the vehicle on the level place. (b) Remove the differential filler plug and gasket. (c) Check that the oil surface is within 5 mm (0.20 in.) from the lowest position of the inner surface of the differential filler plug opening. NOTICE: ...

Turbine Speed Sensor Circuit No Signal
DESCRIPTION This sensor detects the rotation speed of the input turbine. By comparing the input turbine speed signal (NT) with the counter gear speed sensor signal (NC), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure accor ...

Removal
1. DRAIN AUTOMATIC TRANSAXLE FLUID (See page AX-131) 2. REMOVE NO. 1 TRANSFER CASE PLUG (See page TF-8) 3. REMOVE TRANSFER DRAIN PLUG (a) Remove the transfer drain plug, gasket and bleed the drain transfer oil. 4. REMOVE FRONT WHEEL 5. REMOVE FRONT DRIVE SHAFT ASSEMBLY RH HINT: (See page D ...

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