Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT TORQUE SENSOR USING M-MDS Connect the M-MDS to the DLC-2. Switch the ignition ON (engine off). Access "STR_TRQ_S_M" and "STR_TRQ_S_S" PIDs. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS .) Verify that the data monitor value changes when the steering wheel is turned. Left: 0-positive Right: 0- negative Do the torque sensor signal values change in the same way?	Yes	Malfunction may be temporary. Go to step 3.
1		No	Go to the next step.
2	INSPECT TORQUE SENSOR CONNECTOR AND TORQUE SENSOR WIRING HARNESS Switch the ignition OFF. Disconnect the torque sensor connector. Are the connector connection, connector pins, and wiring harness normal?	Yes	Replace the steering column (torque sensor), then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
2		No	Repair or replace the connector or wiring harness, then go to the next step.
3	VERIFY THAT SAME DTC IS NOT PRESENT Clear the DTC from the memory. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS .) Is the same DTC present? (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS .)	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the EPS CM, then go to the next step. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION .)
3		No	Go to the next step.
4	VERIFY THAT NO OTHER DTCs ARE PRESENT Are any other DTCs output? (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS .)	Yes	Go to the applicable DTC inspection. (See ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS .)
4		No	DTC troubleshooting completed.