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

Toyota Yaris XP210 (2020-2026) 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	○	-
Malfunction Status	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.

(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

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the O119 AWD ECU assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O119-1 (GND) - Body ground	Always	Below 1 Ω

REPLACE AWD ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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