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
System diagram
The configuration of the electronic control system in the U151E automatic transaxles is as shown in the following chart.
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:
Inspection
1. INSPECT THERMOSTAT
(a) Inspect the thermostat.
HINT:
The valve opening temperature is inscribed on the
thermostat.
(b) Immerse the thermostat in water and gradually heat
the water.
(c) Check the valve opening temperature.
Valve opening temperature:
80 to 84°C (176 to 183°F) ...
Skid Control Buzzer Circuit
DESCRIPTION
The skid control buzzer sounds and SLIP indicator blinking during VSC
operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SKID CONTROL BUZZER)
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the ...
Operating instructions
Turning the end of the lever turns on the lights as follows:
The illustration is intended as an example.
U.S.A.
Canada
The headlights, side marker,
parking lights, daytime running
lights (if equipped) and so on turn on and off
automatically (when the engine switch is ...
