Inspection Procedure

HINT:

Check the condition of each related circuit connector before troubleshooting (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
When C1774 is output, inspect and repair the trouble areas indicated by C1774 first (See DTC C1774 LOW BATTERY POSITIVE VOLTAGE ).

CHECK DTC

Clear the DTC (See FAIL-SAFE CHART ).
Turn the engine switch off.
Turn the engine switch on (IG) again and check that no CAN communication system DTC is output.
Start the engine.

Drive the vehicle and turn the steering wheel to the right and left at the speed of 24 mph (35 km/h) to check that a DTC is output (See DTC CHECK/CLEAR , BC-54 (2GR-FSE) and BC-296 (1UR-FSE)).

Result

DTC RESULT REFERENCE

Result	Proceed to
Only DTC C1777 is output	A
CAN communication system DTC is output	B
Steering angle sensor DTC is output (Brake control system trouble code C1231/31)	C

B : REPAIR CIRCUIT INDICATED BY OUTPUT CODE

C : REPAIR CIRCUIT INDICATED BY OUTPUT CODE

A : Go to Next Step

CHECK HARNESS AND CONNECTOR (STEERING ANGLE SENSOR INPUT VOLTAGE)

Disconnect the steering angle sensor connector.
Turn the engine switch on (IG).

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

Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
K19-1 (IG) - K19-2 (ESS)	Engine switch on (IG)	10 to 14 V

Turn the engine switch off.

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

Fig 1: Identifying Steering Angle Sensor Connector Terminal

Resistance

RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
K19-2 (ESS) - Body ground	Below 1 Ω

Result

DTC RESULT REFERENCE

Result	Proceed to
OK	A
OK (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)	B
NG	C

B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C : REPAIR OR REPLACE HARNESS OR CONNECTOR

A : REPLACE STEERING ANGLE SENSOR