C1552

DTC C1551: Hall-IC output voltage
DTC C1552: Hall-IC output pattern
DTC C1553: Optical sensor
DTC C1554: Speed sensor is out of range
DTC C1555: Steering angle SNS. out of range
DTC C1608: EEPROM failure

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:
If these DTCs has been set, TCL/ASC-ECU related DTC C1506 is also set. After these DTCs has been diagnosed, don't forget to erase DTC C1506.

CIRCUIT OPERATION

- The steering wheel sensor is energized via the ignition switch, and communicates the TCL/ASC-ECU via a CAN bus-line.
- The steering wheel sensor has a self-diagnosis function and a memory function. If the diagnosis function finds a trouble, it sends these DTC codes to the TCL/ASC-ECU. Then the ECU will illuminate the TCL/ASC indicator light. At this time, the TCL/ASC-ECU sets DTC No. C1506 (Steering angle sensor error).

TCL/ASC DTC SET CONDITIONS

These diagnostic trouble codes will be set under the cases below.
DTC C1551: Hall-IC output voltage

- The Hall cell sends incorrect voltage signal for at least one second.
DTC C1552: Hall-IC output pattern

- Invalid Hall cell pattern fluctuates at least once.
DTC C1553: Optical sensor

- The optical sensor output is invalid.
DTC C1554: Speed sensor is out of range

- The sensor speed is 25°/10 ms or more.
DTC C1555: Steering angle SNS. out of range

- The sensor is out of a predetermined operation range.
DTC C1608: EEPROM failure

- The sensor detects an EEPROM error.

TROUBLESHOOTING HINTS (The most likely causes for these DTCs are to set are:)

Malfunction of the steering wheel sensor

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 2.

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

STEP 2. Recheck for steering wheel sensor 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 C1551, C1552, C1553, C1554, C1555 or C1608 set?

YES Replace steering wheel sensor.

NO The procedure is complete.