DTC C1277, C1278, C1306, C1307 [DYNAMIC STABILITY CONTROL (DSC)]

id0402b2808000

DTC

C1277, C1278, C1306, C1307

Steering angle sensor

DETECTION CONDITION

•  C 1277

―  Output voltage from steering angle sensor signals 1 and 2 is other than 0.25—0.75 V or 4.25—4.75 V

―  Signal from steering angle sensor changes when speed is not within specification (14 pulses/7 ms (3000°/S) or more)

•  C 1278

―  The steering angle sensor detects signal modulation or steering angle that exceeds specification.

•  C 1306

―  The neutral position of the steering angle cannot be estimated from the signals from the ABS wheel-speed sensors and the combined sensor.

•  C 1307

―  The signal from the steering angle sensor remains unchanged when the steering angle is turned to the right and left.

POSSIBLE CAUSE

•  Improper installation or positioning of the steering angle sensor

•  Open circuit in the wiring harness between DSC HU/CM terminal AB and steering angle sensor terminal A

•  Open circuit in the wiring harness between DSC HU/CM terminal AE and steering angle sensor terminal C, short to battery or to ground

•  Open circuit in the wiring harness between DSC HU/CM terminal AN and steering angle sensor terminal B, short to battery or to ground

•  Open circuit in the wiring harness between DSC HU/CM terminal AH and steering angle sensor terminal D

•  Signal error from the ABS wheel-speed sensor

•  Signal error from the combined sensor

•  Signal errors from sensors due to rough road driving

•  Steering angle sensor malfunction

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT STEERING ANGLE SENSOR POWER SUPPLY FOR OPEN CIRCUIT • Turn the ignition switch to the ON position. • Measure the voltage between the steering angle sensor terminal A and body ground. • Is the voltage B+?	Yes	Go to the next step.
1		No	Repair or replace the wiring harness, then go to Step 8.
2	INSPECT STEERING ANGLE SENSOR GROUND FOR OPEN CIRCUIT • Turn the ignition switch off. • Inspect for continuity between the steering angle sensor terminal D and body ground. • Is there continuity?	Yes	Go to the next step.
2		No	Repair or replace the wiring harness, then go to Step 8.
3	INSPECT STEERING ANGLE SENSOR SIGNAL FOR OPEN CIRCUIT • Disconnect the DSC HU/CM connectors. • Inspect for continuity between the DSC HU/CM connectors (vehicle harness-side) and the following steering angle sensor connector terminals: ― Steering angle sensor (Sensor 1 system): AN—B ― Steering angle sensor (Sensor 2 system): AE—C • Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness, then go to Step 8.
4	INSPECT STEERING ANGLE SENSOR SIGNAL FOR SHORT TO GROUND • Disconnect the steering angle sensor connectors • Inspect for continuity between the following steering angle sensor connector terminals (vehicle harness-side) and body ground: ― Steering angle sensor (Sensor 1 system): B—Body ground ― Steering angle sensor (Sensor 2 system): C—Body ground • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 8.
4		No	Go to the next step.
5	INSPECT STEERING ANGLE SENSOR SIGNAL FOR SHORT TO POWER SUPPLY CIRCUIT • Measure voltage between the following steering angle sensor connector terminals (vehicle harness-side) and body ground: ― Steering angle sensor (Sensor 1 system): B—Body ground ― Steering angle sensor (Sensor 2 system): C—Body ground • Is the voltage 1 V or less?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness, then go to Step 8.
6	INSPECT FOR IMPROPER INSTALLATION OF STEERING ANGLE SENSOR • Is the installation normal?	Yes	Go to the next step.
6		No	Repair installation or replace the steering angle sensor, then go to Step 8. (See CLOCK SPRING REMOVAL/INSTALLATION.)
7	INSPECT STEERING ANGLE SENSOR • Reconnect all disconnected connectors. • Inspect the steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.) • Is the steering angle sensor normal?	Yes	Go to the next step.
7		No	Replace the steering angle sensor, then go to the next step. (See CLOCK SPRING REMOVAL/INSTALLATION.)
8	VERIFY THAT THE SAME DTC IS NOT PRESENT • Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more. • Are the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION.)
8		No	Go to the next step.
9	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
9		No	DTC troubleshooting completed.

DTC	C1277, C1278, C1306, C1307		Steering angle sensor
DETECTION CONDITION		• C 1277 ― Output voltage from steering angle sensor signals 1 and 2 is other than 0.25—0.75 V or 4.25—4.75 V ― Signal from steering angle sensor changes when speed is not within specification (14 pulses/7 ms (3000°/S) or more) • C 1278 ― The steering angle sensor detects signal modulation or steering angle that exceeds specification. • C 1306 ― The neutral position of the steering angle cannot be estimated from the signals from the ABS wheel-speed sensors and the combined sensor. • C 1307 ― The signal from the steering angle sensor remains unchanged when the steering angle is turned to the right and left.
POSSIBLE CAUSE		• Improper installation or positioning of the steering angle sensor • Open circuit in the wiring harness between DSC HU/CM terminal AB and steering angle sensor terminal A • Open circuit in the wiring harness between DSC HU/CM terminal AE and steering angle sensor terminal C, short to battery or to ground • Open circuit in the wiring harness between DSC HU/CM terminal AN and steering angle sensor terminal B, short to battery or to ground • Open circuit in the wiring harness between DSC HU/CM terminal AH and steering angle sensor terminal D • Signal error from the ABS wheel-speed sensor • Signal error from the combined sensor • Signal errors from sensors due to rough road driving • Steering angle sensor malfunction • Poor connection at connectors (female terminal)