Toyota Sienna Service Manual: ECM Communication Stop Mode
DESCRIPTION
Detection Item |
Symptom |
Trouble Area |
ECM Communication Stop
Mode |
- "Engine" is not displayed on the "Communication
Bus Check" screen of the intelligent tester
- Applies to "ECM Communication Stop Mode" in the
"DTC COMBINATION TABLE"
|
- Power source circuit of ECM
- CAN main wire or connector
- ECM
|
WIRING DIAGRAM
![WIRING DIAGRAM](images/books/424/92/index584.jpg)
INSPECTION PROCEDURE
NOTICE:
- Turn the ignition switch off before measuring the resistances of
CAN bus main wires and CAN
bus branch wires.
- After the ignition switch is turned off, check that the key
reminder warning system and light
reminder warning system are not in operation.
- Before measuring the resistance, leave the vehicle as is for at
least 1 minute and do not operate
the ignition switch, any other switches, or the doors. If any doors need to
be opened in order to
check connectors, open the doors and leave them open.
HINT:
Operating the ignition switch, any switches, or any doors triggers related ECU
and sensor communication
with the CAN. This communication will cause the resistance value to change.
1 CHECK OPEN IN CAN BUS WIRE (ECU MAIN BUS WIRE)
![CHECK OPEN IN CAN BUS WIRE (ECU MAIN BUS WIRE)](images/books/424/92/index585.jpg)
- Disconnect ECM connector (E5).
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
![Standard resistance](images/books/424/92/index586.jpg)
2 CHECK WIRE HARNESS (E1, BATT, +BM, IGSW)
![CHECK WIRE HARNESS (E1, BATT, +BM, IGSW)](images/books/424/92/index587.jpg)
- Disconnect the ECM connector (E11).
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
![Standard resistance](images/books/424/92/index588.jpg)
- Disconnect the ECM connector (E4).
![CHECK WIRE HARNESS (E1, BATT, +BM, IGSW)](images/books/424/92/index589.jpg)
- Measure the voltage according to the value(s) in the
table below.
Standard voltage
![Standard voltage](images/books/424/92/index590.jpg)
REPLACE ECM
DESCRIPTION
Detection Item
Symptom
Trouble Area
Yaw Rate Sensor
Communication Stop
Mode
"Yaw rate/ Deceleration sensor" is not displayed ...
DESCRIPTION
When any DTC for the CAN communication system is output, first measure the
resistance between the
terminals of the DLC3 to specify the trouble area, and check that there is no
short ...
Other materials:
Fuel Pump Control Circuit
DESCRIPTION
The FUEL PUMP relay switches the fuel pump speed according to the engine
conditions. The fuel pump
operates when the ECM receives the starter-operating signal (STA) and
crankshaft-rotating signal (NE).
The FUEL PUMP relay is turned ON while the engine is idling or operating at l ...
Intake Air Temperature Sensor Gradient Too
High
DTC P0111 Intake Air Temperature Sensor Gradient Too
High
DESCRIPTION
The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF)
meter, monitors the IAT.
The IAT sensor has a built-in thermistor with a resistance that varies according
to the temperature of the
intake ...
Radiator
COMPONENTS
...