( TL19E00K72200000000BBAT10 )

How to Troubleshoot the EPS

EPS Indicator
Under normal conditions, the EPS indicator comes on when the ignition switch is turned to ON (II) position, then goes off after the engine is started. This indicates that the LED and its circuit are operating correctly.
If there is a failure in the system after the engine is started, the EPS indicator will stay on, and the power assist is turned off or restricted.
When the EPS indicator comes on, the control unit memorizes the DTC. In this case, the control unit will not activate the EPS system after the engine starts again, but it keeps the EPS indicator on.
When DTC 51-01, 51-02 or 51-06 is stored in the control unit, the EPS indicator will stay on until the DTC is erased. When a problem is detected and the EPS indicator comes on, there are cases when the indicator stays on until the ignition switch is turned to LOCK (0), and cases when the indicator goes off automatically when the system returns to normal. Even though the system is operating normally, the EPS indicator will come on under the following conditions:

- The vehicle speed decreases abruptly from 20 km/h (12 mph) or more (by applying the brakes), and it is less than 1 km/h (1 mph) and engine speed is 1,650 rpm (min −1 ) (after the engine starts within 5 minutes: 2,150 rpm (min −1 )) or above for 5 seconds (continuously) after the abrupt deceleration.
- While turning the steering wheel with the vehicle speed of 0 km/h (0 mph) or less for 20 seconds (continuously), and the engine speed is 1,650 rpm (min −1 ) or above for at least 10 seconds.
- When the engine speed is 500 rpm (min −1 ) or less, and the vehicle is traveling at a speed of 10 km/h (6 mph) or more for about 3 seconds (continuously).

To determine the actual cause of the problem, question the customer about the conditions during which the problem occured, taking the above conditions into consideration.