EPS

Control System DTCs

EPS DTC Troubleshooting: 71-01, 71-02, 71-03, 71-07

DTC 71-01 : Motor Angle Sensor (SIN/COS Signals)
DTC 71-02 : Motor Angle Sensor (Neutral Position Learning of SIN/COS)
DTC 71-03 : Motor Angle Sensor (SIN/COS Signals)
DTC 71-07 : Motor Angle Sensor (SIN/COS Signals)

1. Problem verification:

Problem verification
-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS.

-3. Turn the ignition switch to LOCK (0).

-4. Start the engine.

-5. Turn the steering wheel to the right or left, and wait 10 seconds or more.

-6. Check for DTCs with the HDS

Is DTC 71-01, 71-02, 71-03, or 71-07 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. If another DTC is indicated, go to the indicated DTC's troubleshooting.

2. EPS motor angle sensor internal resistance check (RESOLVER lines) 1:

EPS motor angle sensor internal resistance check (RESOLVER lines) 1
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. Measure the resistance between test points 1 and 2.


















Is the resistance between RESOLVER_R1-RESOLVER_R2 13-25 Ohms, RESOLVER_S1-RESOLVER_S3 26-49 Ohms, and RESOLVER_S2-RESOLVER_S4 26-49 Ohms?
-YES- Go to step 3.
-NO- Go to step 5.

3. Shorted wire check (RESOLVER lines) 1:

Shorted wire check (RESOLVER lines) 1
-1. Check for continuity between these test points and body ground individually.














Is there continuity?
-YES- Go to step 4.
-NO- The RESOLVER wires are OK. Go to step 6.

4. Shorted wire check (RESOLVER lines) 2:

Shorted wire check (RESOLVER lines) 2
-1. Disconnect the following connector.





-2. On the sensor side, check for continuity between these test points and body ground individually.














Is there continuity?
-YES- The RESOLVER wires are OK. Replace the EPS motor Service and Repair.
-NO- Repair a short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit.

5. EPS motor angle sensor internal resistance check (RESOLVER lines) 2:

EPS motor angle sensor internal resistance check (RESOLVER lines) 2
-1. Disconnect the following connector.





-2. On the sensor side, measure the resistance between test points 1 and 2.


















Is the resistance between RESOLVER_R1-RESOLVER_R2 13-25 Ohms, RESOLVER_S1-RESOLVER_S3 26-49 Ohms, and RESOLVER_S2-RESOLVER_S4 26-49 Ohms?
-YES-
* Repair an open in the wire between the EPS motor angle sensor 6P connector and the EPS control unit.
* Repair a short to body ground in the wire between the EPS motor angle sensor 6P connector and the EPS control unit.
-NO- Replace the EPS motor (motor angle sensor) Service and Repair.

6. EPS control unit check (update):

EPS control unit check (update)
-1. Reconnect the following connector.





-2. Turn the ignition switch to ON (II).

-3. Update the EPS control unit Programming and Relearning if it does not have the latest software.

-4. Start the engine.

-5. Turn the steering wheel to the right or left, and wait 10 seconds or more.

-6. Check for DTCs with the HDS.

Is DTC 71-01, 71-02, 71-03, or 71-07 indicated?
-YES- Replace the EPS control unit Service and Repair.
-NO- Troubleshooting is complete.