DTC 71-01, 71-03: Motor Angle Sensor (SIN/COS Signals); Motor Angle Sensor (SIN/COS Signals)

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Start the engine.
Turn the steering wheel to the right or left, and wait 10 seconds or more.
Check for DTCs with the HDS.
Is DTC 71-01 or 71-03 indicated?

YES - Go to step 7.

NO - Intermittent failure, the system is OK at this time.
Turn the ignition switch to LOCK (0).
Disconnect EPS control unit connector B (16P), (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).
Measure the resistance between the following terminals of EPS control unit connector B (16P).

Fig 1: Measuring Resistance Between Terminals Of EPS Control Unit Connector B (16P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance between R1 - R2 13.5 - 17.5 Ω, S1-S3 25 - 32 Ω, and S2 - S4 25 - 32 Ω?

YES - Go to step 10.

NO - Go to step 13.
Check for continuity between body ground and EPS control unit connector B (16P) terminals No. 7, No. 9, No. 10, No. 11, No. 12, and No. 13 individually.

Fig 2: Checking Continuity Between Body Ground & EPS Control Unit Connector B (16P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 11.

NO - Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit (see EPS CONTROL UNIT REMOVAL/INSTALLATION ).
Disconnect the EPS motor angle sensor 8P connector (see STEERING GEARBOX REMOVAL AND INSTALLATION step 22 ).
On the sensor side, check for continuity between body ground and the EPS motor angle sensor 8P connector terminals No. 1, No. 2, No. 3, No. 5, No. 6, and No. 7 individually.

Fig 3: Checking Continuity Between Body Ground & EPS Motor Angle Sensor 8P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Replace the EPS motor (see EPS MOTOR REMOVAL AND INSTALLATION ).

NO - Repair short to body ground in the wire between the EPS motor angle sensor 8P connector and the EPS control unit.
Disconnect the EPS motor angle sensor 8P connector (see STEERING GEARBOX REMOVAL AND INSTALLATION step 22 ).
On the sensor side, measure the resistance between the following terminals of the EPS motor angle sensor 8P connector.

Fig 4: Measuring Resistance Between Terminals Of EPS Motor Angle Sensor 8P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance between R1-R2 13.5 - 17.5 Ω, S1 - S3 25 - 32 Ω, and S2-84 25-32 Ω ?

YES - Repair an open or short in the wire between the EPS control unit and the EPS motor angle sensor.

NO - Replace the EPS motor (see EPS MOTOR REMOVAL AND INSTALLATION ).