Specifications

Chassis Specialist : Electric Power Steering

Page 23

OFF

Long blinks

(two times)

Short blinks

(three times)

Example of DTC 23

EPS Indicator Light Operation

Whenever the EPS indicator is illuminated, the vehicle will have reduced or no power steering assist.

The light will illuminate briefly for a bulb check on start up and will illuminate anytime a system fault

is detected. The light will illuminate if the EPS controller is defective or loses battery power but no

diagnostic codes will be set. If a torque sensor code is set, the light will remain on until the DTC is

cleared. Engine speed, vehicle speed and voltage concerns will set a DTC and keep the light on until

the system detects normal operation. No other system DTC’s keep the indicator on until the end of the

key cycle.

The indicator light can be commanded on due to three customer induced driving habits. The first

condition is if the vehicle is driving at or above 20 km/h (12.4 mph) with a sudden rapid change in

speed, the speed signal drops or the vehicle stops for 5 seconds and the engine speed remains above

1,649 rpm. The second condition is if the vehicle or speed signal reads 0 km/h for 10 seconds with an

engine speed of 1,640 rpm or higher for 20 seconds. The last condition the customer can set is the

engine speed is less than 280 rpm with the vehicle travelling above 10km/h (6.2 mph) for greater than 3

seconds.

Diagnostic trouble codes can be read using a scan tool. Turn the ignition OFF before connecting the

scan tool. The DLC is located under the dash on the driver’s side. Turn the ignition ON and follow the

prompts on the scan tool.

If a scan tool is not available, system codes can be retrieved by using the Service Check Signal Method

 Verify the wheels are in the straight ahead position with the ignition OFF

 Short DLC pin 9 to ground

 Turn the ignition ON with the engine OFF

 Observe the EPS indicator light blinking in the instrument panel

 The indicator will display long and short blinks. The long blinks indicate 10’s with the short

blinks indicate single numbers (i.e. four long blinks followed by two short blinks indicates a code

42.)

 After retrieving the trouble codes turn the ignition off and remove the jumper cable from pin 9 of

the DLC