Toyota Yaris: Active Torque Split Awd System / Supply Voltage Circuit Circuit Voltage Out of Range (C123A1C)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Drivetrain / Gf1a (transfer / 4wd / Awd) / Active Torque Split Awd System / Supply Voltage Circuit Circuit Voltage Out of Range (C123A1C)

DESCRIPTION

When a malfunction has occurred in the power source circuit, the AWD ECU assembly stores DTC C123A1C.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

C123A1C

Supply Voltage Circuit Circuit Voltage Out of Range

  • At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9.5 V for 10 seconds or more
  • The IG1 terminal voltage is 17 V or more for 3 seconds or more
  • Wire harness or connector
  • AWD ECU assembly

Displayed

Yes

DTC Detection Conditions: C123A1C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

The vehicle speed is 3 km/h (2 mph) or more

-

Malfunction Status

The IG1 terminal voltage is less than 9.5 V

-

The IG1 terminal voltage is 17 V or more

-

Detection Time

10 seconds or more

3 seconds or more

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • When the AWD ECU assembly is replaced, before removing the AWD ECU assembly, it is necessary to perform ECU Data Save to save the original AWD ECU assembly information.

    Click here

  • After performing repairs, clear the DTCs and check that the DTCs are not output again.

    Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the O119 AWD ECU assembly connector.

(c) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

O119-24 (IG1) - Body ground

Ignition switch ON

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the O119 AWD ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O119-1 (GND) - Body ground

Always

Below 1 Ω

OK

REPLACE AWD ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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