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:

Ignition Switch Circuit
DESCRIPTION When the ignition switch is turned to the ON position, battery positive voltage is applied to terminal IG of the ECU. When battery positive voltage is applied to terminal IG of the ECU while the theft deterrent system is operating, the warning stops. WIRING DIAGRAM INSPECTIO ...

Problem symptoms table
RESULT LIST OF CHECK CAN BUS LINE Symptom Suspected Area All ECUs and sensors connected to the CAN communication system are not displayed on intelligent tester CAN Bus Line The result of "CAN BUS WIRE CHECK" is "Open in CAN Main Bus Lin ...

Removal
1. DRAIN POWER STEERING FLUID 2. REMOVE FRONT WHEEL RH 3. REMOVE FRONT FENDER APRON SEAL RH (See page EM-26) 4. REMOVE FAN AND GENERATOR V BELT (See page EM-6) 5. DISCONNECT NO. 1 FLUID RESERVOIR TO PUMP HOSE (a) Slide the clip and disconnect the No. 1 fluid reservoir to pump hose from t ...