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DTC C1955, C1956 [DSC]

id040220875400

DTC | C1955, C1956 | Steering angle sensor
DETECTION CONDITION | • C1955: - Output voltages from steering angle sensors 1 and 2 are not at 1 V or less, or not at 3.25 V or more • C1956: - Sensor 1 voltage remains unchanged, sensor 2 voltage changes - Sensor 2 voltage remains unchanged, sensor 1 voltage changes - When steering wheel is turned in specified direction, neutral position is detected even when rotated at 18 degrees or more
POSSIBLE CAUSE | • Open circuit in harness between steering angle sensor terminal A and ignition switch • Open, short to power, or short to ground circuit in harness between DSC HU/CM terminal X and steering angle sensor terminal B • Open, short to power, or short to ground circuit in harness between DSC HU/CM terminal W and steering angle sensor terminal C • Open, short to power, or short to ground circuit in harness between DSC HU/CM terminal U and steering angle sensor terminal D • Open circuit in harness between DSC HU/CM terminal Rand steering angle sensor terminal F • Malfunction of steering angle sensor

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn ignition key to ON (engine OFF). • Measure voltage between steering angle sensor terminal A (harness side) and ground. • Is voltage B+? | Yes | Go to next step.
No | Repair or replace harness for open circuit between steering angle sensor terminal A and ignition switch, then go to Step 7.
2 | INSPECT STEERING ANGLE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT • Turn ignition key to OFF. • Disconnect DSC HU/CM and steering angle sensor connectors. • Inspect continuity between DSC HU/CM terminal R (harness side) and steering angle sensor terminal F (harness side). • Is there continuity? | Yes | Go to next step.
No | Repair or replace harness for open circuit between DSC HU/CM terminal R and steering angle sensor terminal F, then go to Step 7.
3 | INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT • Inspect continuity between DSC HU/CM terminal (harness side) and steering angle sensor terminal (harness side) below. - Sensor 1: DSC HU/CM X and steering angle sensor B - Sensor 2: DSC HU/CM W and steering sensor C - Neutral: DSC HU/CM U and steering angle sensor D • Is there continuity? | Yes | Go to next step.
No | Repair or replace harness for open circuit between DSC HU/CM terminal and steering angle sensor terminal, then go to Step 7.
4 | INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER • Turn ignition key to ON (engine OFF). • Measure voltage between DSC HU/CM terminal (harness side) and ground below. - Sensor 1: DSC HU/CM X and ground - Sensor 2: DSC HU/CM W and ground - Neutral: DSC HU/CM U and ground • Is voltage B+? | Yes | Repair or replace harness for short to power circuit between DSC HU/CM terminal and steering angle sensor terminal, then go to Step 7.
No | Go to next step.
5 | INSPECT STEERING ANGLE SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn ignition key to OFF. • Inspect continuity between DSC HU/CM terminal (harness side) and ground below. - Sensor 1: DSC HU/CM X and ground - Sensor 2: DSC HU/CM W and ground - Neutral: DSC HU/CM U and ground • Is there continuity? | Yes | Repair or replace harness for short to ground circuit between DSC HU/CM terminal and steering angle sensor terminal, then go to Step 7.
No | Go to next step.
6 | INSPECT STEERING ANGLE SENSOR • Inspect steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.) • Is it normal? | Yes | Go to next step.
No | Replace steering angle sensor, then go to next step.
7 | VERIFY TROUBLESHOOTING COMPLETED • Clear DTC from memory. (See Clearing DTCs Procedures.) • Is the same DTC present? | Yes | Replace DSC HU/CM, then go to next step.
No | Go to next step.
8 | VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output? | Yes | Go to the applicable DTC inspection. (See DTC Table.)
No | DTC troubleshooting completed.