DTC Troubleshooting: 4

LKAS Control Unit DTC 4: A Problem with the Steering Angle Sensor Z Phase

1. Clear the DTCs with the HDS.

1. Turn the ignition switch OFF, then turn it ON (II).

1. Turn the steering wheel 360 degrees to the right, and wait for 20 seconds or more.

1. Watch the adaptive cruise control (ACC)/LKAS indicator.

Does the adaptive cruise control (ACC)/LKAS indicator come on?

YES | - | Go to Step 5 .
NO | - | Intermittent failure, the system is OK at this time.■

1. Check for DTCs with HDS.

Is DTC 4 indicated?

YES | - | Go to Step 6 .
NO | - | Do the appropriate troubleshooting for the cord indicated.■

1. Turn the ignition switch ON (II).

1. Measure the voltage between body ground and steering angle sensor 5P connector terminal No. 2, No. 3 and No. 4 individually.

Is there 5 V or more?

YES | - | Repair short to power in the wire between the LKAS control unit and the steering angle sensor.■
NO | - | Go to Step 8 .

1. Disconnect the steering angle sensor 5P connector, VSA modulator-control unit 47P connector and LKAS control unit 26P connector.

1. Check for continuity between body ground and steering angle sensor 5P connector terminal No. 2, No. 3 and No. 4 individually.

Is there continuity?

YES | - | Repair short to body ground in the wire between the LKAS control unit and the steering angle sensor.■
NO | - | Go to Step 10 .

1. Check for continuity between LKAS control unit 26P connector terminal No. 18 and steering angle sensor 5P connector terminal No. 2.

Is there continuity?

YES | - | Go to Step 11 .
NO | - | Repair an open in the wire between the LKAS control unit and the steering angle sensor.■

1. Check for continuity between LKAS control unit 26P connector terminal No. 5 and steering angle sensor 5P connector terminal No. 4.

Is there continuity?

YES | - | Go to Step 12 .
NO | - | Repair an open in the wire between the LKAS control unit and the steering angle sensor.■

1. Check for continuity between LKAS control unit 26P connector terminal No. 6 and steering angle sensor 5P connector terminal No. 3.

Is there continuity?

YES | - | Go to Step 13 .
NO | - | Repair an open in the wire between the LKAS control unit and the steering angle sensor.■

1. Check for VSA modulator-control unit DTCs with HDS.

Is there DTC?

YES | - | Do the troubleshooting for the VSA modulator-control unit. ■
NO | - | Check for loose terminals in the LKAS control unit connectors, and repair if necessary. If no poor connections are found, replace the LKAS control unit. ■