Toyota Venza manuals

Toyota Venza: IG Power Supply Voltage Malfunction (C1551)

Toyota Venza Service Manual / Power Assist Systems / Power Steering System / IG Power Supply Voltage Malfunction (C1551)

DESCRIPTION

The power steering ECU distinguishes the ignition switch status as ON or off through the IG power source circuit.

DTC No.

DTC Detection Condition

Trouble Area

C1551

IG power source circuit malfunction inside ECU

  • ECU-IG No. 2 fuse
  • IG power source circuit
  • Power steering ECU

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • If the power steering ECU has been replaced with a new one, perform the rotation angle sensor initialization and torque sensor zero point calibration (See page ).

  • Inspection the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (IG POWER SUPPLY)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Select the items "IG Power Supply" in the Data List and read the value displayed on the Techstream.

EMPS

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

IG Power Supply

ECU power source voltage/

Min.: 0 V

Max.: 20.1531 V

11 to 14 V

Ignition switch ON

OK:

Normal condition value is displayed the Techstream.


OK

REPLACE POWER STEERING ECU


NG

2.

CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU)

(a) Disconnect the connectors from the power steering ECU.


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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D20-6 (IG) - Body ground

Ignition switch ON

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D19-2 (PGND) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Power Steering ECU)


OK

REPLACE POWER STEERING ECU


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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