Toyota Venza: Certification ECU Communication Stop Mode

Toyota Venza Service Manual / Networking / Can Communication System / Certification ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Certification ECU Communication Stop Mode	"Smart Access/Smart Key/Wireless Tuner" is not displayed on "CAN Bus Check" screen of the Techstream. Applies to Certification ECU Communication Stop Mode in DTC Combination Table.	Power source circuit of certification ECU Certification ECU branch wire or connector Certification ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
Turn the ignition switch off before inspecting CAN bus wires for a ground short.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
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 other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.	CHECK CAN BUS WIRE FOR DISCONNECTION (CERTIFICATION ECU BRANCH WIRE)

(a) Turn the ignition switch off.

(b) Disconnect the connector of the certification ECU.

Text in Illustration

*1	Front view of wire harness connector (to Certification ECU)

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
D25-9 (CANH) - D25-10 (CANL)	Ignition switch off	54 to 69 Ω

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU BRANCH WIRE)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D25-1 (+B) - Body ground	Always	11 to 14 V
D25-16 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Certification ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

3.	CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D25-15 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Certification ECU)

REPLACE SMART KEY ECU ASSEMBLY (CERTIFICATION ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

Power Management Control ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Power Management Control ECU Communication Stop Mode "Electric Power Contr ...

Combination Meter ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Combination Meter ECU Communication Stop Mode "Combination Meter" is ...

Other materials about Toyota Venza:

Back Door Motor Clutch Malfunction (B2225)
DESCRIPTION When an electrical malfunction (open or short) is detected in the clutch circuit of the power back door ECU (power back door motor unit) while the power back door is operating, the power back door ECU (power back door motor unit) stores DTC B2 ...

Brake Switch "A" Circuit (P0571)
DESCRIPTION When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunct ...

System Diagram
SYSTEM DIAGRAM Communication Table Transmitting ECU (Transmitter) Receiving ECU (Receiver) Signal Communication Method Certification ECU (smart key ECU assembly) Power management contro ...