Toyota Sienna Service Manual: ECM Communication Stop Mode

Toyota Sienna Service Manual / Can communication / Can communication system / Fail-safe chart / 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

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)

Disconnect ECM connector (E5).
Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

2 CHECK WIRE HARNESS (E1, BATT, +BM, IGSW)

CHECK WIRE HARNESS (E1, BATT, +BM, IGSW)

Disconnect the ECM connector (E11).
Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

Disconnect the ECM connector (E4).

CHECK WIRE HARNESS (E1, BATT, +BM, IGSW)

Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

REPLACE ECM

Yaw Rate Sensor Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Yaw Rate Sensor Communication Stop Mode "Yaw rate/ Deceleration sensor" is not displayed ...

CAN Bus Line

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:

Jam Protection Function Activates During Power Slide Door LH Operation
DESCRIPTION It may be caused by ill-fitting slide door, faulty touch sensor or faulty pulse sensor. The power slide door ECU activates the slide motor to open / close the power slide door, thus controlling the power slide door operation. For jam and foreign object detect ...

Short in Side Squib LH Circuit
DTC B0115/47 Short in Side Squib LH Circuit DESCRIPTION The side squib LH circuit consists of the center airbag sensor assembly and the front seat side airbag assembly LH. This circuit instructs the SRS to deploy when deployment conditions are met. DTC B0115/47 is recorded when a short ci ...

Disassembly
1. REMOVE NO. 1ULTRASONIC SENSOR RETAINER (w/ Clearance Sonar System) (See page PM-19) 2. REMOVE NO. 1 ULTRASONIC SENSOR (w/ Clearance Sonar System) (See page PM-19) 3. REMOVE REAR BUMPER ENERGY ABSORBER 4. REMOVE REAR BUMPER BAR PLATE Remove the 4 clips and the rear bumper bar plate. 5. ...