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:

Speed sensor check (when using sst check wire)
(a) Check the speed sensor signal. (1) Drive the vehicle straight forward. Drive the vehicle at a speed of 45 km/h (28 mph) or higher for several seconds and check that the ABS warning light goes off. HINT: The signal check may not be completed if the vehicle has its wheels spun or the stee ...

What to do if... (Troubleshooting)
If there is a problem with the hands-free system or a Bluetooth® device, first check the table below. When using the hands-free system with a Bluetooth® device The hands-free system or Bluetooth® device does not work. The connected device may not be a compatible Bl ...

Diagnosis system
1. CHECK BATTERY VOLTAGE Standard voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding. 2. CHECK DLC3 (a) The ECU uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 f ...