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:
Air fuel ratio sensor relay
INSPECTION
1. INSPECT AIR FUEL RATIO SENSOR RELAY
Using an ohmmeter, measure the resistance
according to the value(s) in the table below.
Standard resistance
If the result is not as specified, replace the relay. ...
DVD Error/ Excess Current/ Tray Insertion / Ejection Error
DTC 44-44 DVD Error
DTC 44-48 Excess Current
DTC 44-50 Tray Insertion / Ejection Error
DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
44-44
Operation error in the DVD mechanism.
Television display assembly
44-48
Excess current is ...
Camshaft Position Sensor "A" Circuit
DESCRIPTION
The intake camshaft's Variable Valve Timing (VVT) sensor (G signal) consists
of a magnet and MRE
(Magneto Resistance Element).
The VVT camshaft drive gear has a sensor plate with 3 teeth on its outer
circumference. When the gear
rotates, changes occur in the air gaps betwee ...
