C1505

DTC C1505: Steering angle sensor (detected by ASC side)
DTC C1506: Steering angle sensor error (detected by itself)

CAUTION:
If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.

CAUTION:
The steering wheel sensor-related DTC may be set when DTC C1506 is set. Diagnose the steering wheel sensor first when the steering wheel sensor-related DTC is set.

CIRCUIT OPERATION

- The TCL/ASC-ECU and the steering wheel sensor are connected each other via a CAN bus line, and the sensor sends the steering wheel angle and angular velocity information to the ECU.

TCL/ASC DTC SET CONDITIONS

- These diagnostic trouble codes will be set under the cases below.
DTC C1505: Steering Angle Sensor (signal seizure or abnormal neutral point)

- The steering wheel sensor output value does not fluctuate for more than 20 seconds although the vehicle speed is 15 km/h or more and the G and yaw rate sensor output value is fluctuating.
- The neutral point has been± 180 deg or more and the vehicle speed remains 10 km/h or more for at least one second.
DTC C1506: Steering Angle Sensor (abnormal steering angle)

- When the steering wheel sensor sets a DTC, the TCL/ASC-ECU receives the information and sets this code.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THESE DTCS ARE TO SET ARE:)

Current trouble

- Damaged wiring harness or connector
- Malfunction of the steering wheel sensor
- Malfunction of the hydraulic unit (integrated with TCL/ASC-ECU)

PAST TROUBLE

Carry out diagnosis with particular emphasis on connector(s) or wiring harness between the TCL/ASC-ECU and the steering sensor. For diagnosis procedures, refer to "How to cope with past trouble" How to Treat Past Trouble).

DIAGNOSIS

Required Special Tools:

- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

YES Go to Step 3.

NO Repair the CAN bus line CAN Bus Diagnostics Chart). Then go to Step 2.

STEP 2. Recheck for diagnostic trouble code.

CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1)Turn the ignition switch to the "ON" position.
(2)Erase the DTC.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the DTC is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC C1505 or C1506 set?

YES [C1505 is set] : Go to Step 3.

YES [C1506 is set] : Check the steering wheel sensor DTC, and diagnose the DTC (Refer to C1551).

NO The procedure is complete.

STEP 3. Using scan tool MB991958, check data list item 11: Steering angle.

CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958 to data reading mode for item 11, Steering angle.

- Correct angle is displayed as the steering wheel is turned.

Q. Does the steering wheel sensor send correct steering angle?

YES Go to step 6.

NO Align the steering wheel sensor neutral point and carry out calibration (Refer to Service and Repair). Then go to Step 4.

STEP 4. Recheck for diagnostic trouble code.

Check again if the DTC is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the DTC.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the DTC is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC C1505 set?

YES Go to Step 5.

NO The procedure is complete.

STEP 5. Recheck for diagnostic trouble code after the steering wheel sensor is replaced.

CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Replace the steering wheel sensor (Refer to Service and Repair), and check whether DTC C1505 is reset.
(1)Replace the steering wheel sensor.
(2)Connect scan tool MB991958 to the data link connector.
(3)Turn the ignition switch to the "ON" position.
(4)Erase the DTC.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
(6)Turn the ignition switch to the "ON" position.
(7)Check if the DTC is set.
(8)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC C1505 set?

YES Replace the hydraulic unit (integrated with TCL/ASC-ECU). Then go to Step 7.

NO The procedure is complete.

STEP 6. Recheck for diagnostic trouble code.

Check again if the DTC is set.
(1)Turn the ignition switch to the "ON" position.
(2)Erase the DTC.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
(4)Turn the ignition switch to the "ON" position.
(5)Check if the DTC is set.
(6)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC C1505 set?

YES Replace the hydraulic unit (integrated with TCL/ASC-ECU). Then go to Step 7.

NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.

STEP 7. Recheck for diagnostic trouble code.