DTC Troubleshooting: 27

LKAS Control Unit DTC 27: Steering Angle Sensor (Steering Angle Input Signal)

1. Clear the DTC using the HDS.

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

1. Turn the steering wheel 90 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 DTC with HDS.

Is DTC 27 indicated?

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

1. Turn the ignition switch ON (II).

1. Measure the voltage between body ground and steering angle sensor 5P connector terminal No. 2 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. Turn the ignition switch OFF.

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 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 11 .

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 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. 5 and steering angle sensor 5P connector terminal No. 4.

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 appropriate troubleshooting for the code indicated.■
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. ■