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

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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:

Removal
1. Remove windshield wiper motor assembly hint: (see page ww-4) 2. Remove front outer cowl top panel subassembly (see page em-27) 3. Drain engine coolant (see page co-6) 4. Remove v-bank cover sub-assembly (see page em-28) 5. Remove no. 2 Air cleaner inlet (see page em- 28) 6. Remove no. 1 ...

Power Source Circuit
DESCRIPTION This is the power source circuit for the outer mirror control ECU. WIRING DIAGRAM INSPECTION PROCEDURE 1 INSPECT OUTER MIRROR CONTROL ECU (POWER SOURCE) Disconnect the O9 or O11 ECU connector. Measure the voltage and resistance according to the value(s) in the t ...

DTC check / clear
HINT: Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore, some detailed areas may not be shown exactly the same as on the actual vehicle. If the system cannot enter the diagnostic mode, inspect all AVC-LAN communication ...