DTC B2278

id060200802100

DTC

B2278

Torque sensor

DETECTION CONDITION

• Abnormal input signal detected from torque sensor.

POSSIBLE CAUSE

• Open or short circuit in wiring harness between EPS CM terminals and torque sensor terminals:
- EPS CM terminal 1E-torque sensor terminal A
- EPS CM terminal 1D-torque sensor terminal B
- EPS CM terminal 1B-torque sensor terminal C
- EPS CM terminal 1G-torque sensor terminal D
• EPS CM malfunction
• Torque sensor malfunction
• Poor connection of connectors

Diagnostic procedure

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 and TRQ_SENS_2 PIDs.
• Verify that the data monitor value changes when the steering wheel is turned.

Left: 0- -32 NM (varying within the range)

Right: 0-31.75 NM (varying within the range)

• Do the torque sensor signal values change in the same way?
Yes
Malfunction may be temporary. Go to step 6.
No
Go to the next step.
2
INSPECT WHETHER MALFUNCTION IS CAUSED BY POOR CONNECTION OF EPS CM OR PIN DEFORMATION
• Turn the ignition switch off.
• Inspect connection of the EPS CM and wiring harness.
• Disconnect the EPS CM connector.
• Inspect whether malfunction is caused by bent or poorly connected EPS CM connector pin.
• Are the connector connection, connector pins, and wiring harness normal?
Yes
Go to the next step.
No
Repair or replace the faulty connector wiring harness, then go to Step 6.
3
INSPECT TORQUE SENSOR CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between the EPS CM terminals and torque sensor terminals.
- EPS CM terminal 1E-torque sensor terminal A
- EPS CM terminal 1D-torque sensor terminal B
- EPS CM terminal 1B-torque sensor terminal C
- EPS CM terminal 1G-torque sensor terminal D
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit between the EPS CM and torque sensor, then go to Step 6.
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
- Torque sensor terminal D-ground
• Is there any B+?
Yes
Repair or replace the wiring harness for short to power between the EPS CM and torque sensor, then go to Step 6.
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
- Torque sensor terminal D-ground
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground between the EPS CM and torque sensor, then go to the next step.
No
Replace the steering gear and linkage (torque sensor), then go to the next step.
6
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the memory.
• Turn the ignition switch off.
• Start the engine.
• Is the same DTC present?
Yes
Replace the EPS CM, then go to the next step.
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC Table.)
No
DTC troubleshooting completed.