DTC B2278

DTC	B2278	Torque sensor
DETECTION CONDITION	• Abnormal input signal detected from torque sensor.
POSSIBLE CAUSE	• Open or short circuit in wiring harness between EPS control module terminals and torque sensor terminals: – EPS control module terminal 3A-torque sensor terminal A – EPS control module terminal 3B-torque sensor terminal B – EPS control module terminal 3C-torque sensor terminal C • EPS control module malfunction • Torque sensor malfunction • Poor connection of connectors


STEP	INSPECTION		ACTION
1	INSPECT TORQUE SENSOR USING WDS OR EQUIVALENT • Turn the ignition switch off. • Connect the WDS or equivalent to the DLC-2. • Turn the ignition switch to the ON position (engine OFF). • Access TRQ_SENS PID. • Verify that the data monitor value changes when the steering wheel is turned. Left: 0- -32 NM Right: 0-31.75 NM • Do the torque sensor signal values change in the same way?	Yes	Malfunction may be temporary. Go to step 7.
1		No	Go to the next step.
2	INSPECT WHETHER MALFUNCTION IS CAUSED BY POOR CONNECTION OF EPS CONTROL MODULE OR PIN DEFORMATION • Turn the ignition switch off. • Inspect connection of the EPS control module and wiring harness. • Disconnect the EPS control module connector. • Inspect whether malfunction is caused by bent or poorly connected EPS control module connector pin. • Are the connector connection, connector pins, and wiring harness normal?	Yes	Go to the next step.
2		No	Repair or replace the faulty connector wiring harness, then go to Step 7.
3	INSPECT TORQUE SENSOR CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between the EPS control module terminals and torque sensor terminals. – EPS control module terminal 3A-torque sensor terminal A – EPS control module terminal 3B-torque sensor terminal B – EPS control module terminal 3C-torque sensor terminal C • Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness for open circuit between the EPS control module and torque sensor, then go to Step 7.
4	INSPECT TORQUE SENSOR CIRCUIT FOR SHORT TO POWER • Measure the voltage between the torque sensor terminals and ground. – Torque sensor terminal A-ground – Torque sensor terminal B-ground – Torque sensor terminal C-ground • Is there any B+?	Yes	Repair or replace the wiring harness for short to power between the EPS control module and torque sensor, then go to Step 7.
4		No	Go to the next step.
5	INSPECT TORQUE SENSOR CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between the torque sensor terminals and ground. – Torque sensor terminal A-ground – Torque sensor terminal B-ground – Torque sensor terminal C-ground • Is there continuity?	Yes	Repair or replace the wiring harness for short to ground between the EPS control module and torque sensor, then go to the next step.
5		No	Go to the next step.
6	INSPECT TORQUE SENSOR • Turn the ignition switch off. • Disconnect the torque sensor connector. • Measure the resistance between the torque sensor terminals. – Terminals A-B – Terminals B-C Resistance: 12-15 ohms • Is the torque sensor normal?	Yes	Go to the next step.
6		No	Replace the steering gear and linkage, then go to Step 7. (See STEERING GEAR AND LINKAGE REMOVAL/INSTALLATION.)
7	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the memory. (See Clearing DTCs Procedure.) • Turn the ignition switch off. • Start the engine. • Is the same DTC present?	Yes	Replace the EPS control module, then go to the next step. (See EPS CONTROL MODULE REMOVAL/INSTALLATION.)
7		No	Go to the next step.
8	VERIFY AFTER REPAIR PROCEDURE • Are any other DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC Table.)
8		No	DTC troubleshooting completed.