Code No. U1419:
SAS dynamic range error
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the steering wheel sensor is replaced, always carry out calibration to make
ASTC-ECU learn the neutral point (Refer to ).
- When the hydraulic unit (integrated with ASTC-ECU) is replaced, always carry out
the calibration of the master cylinder pressure sensor, steering wheel sensor and the G and yaw
rate sensor (Refer to ).
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OPERATION
The steering wheel sensor outputs the steering wheel status to ASTC-ECU via the CAN bus
lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASTC-ECU has detected the dynamic range error in the steering wheel
sensor.
PROBABLE CAUSES
Current trouble
- Malfunction of the steering wheel sensor
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
- Noise interference
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between ASTC-ECU and the wheel speed sensor. For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions ).
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No. U1419 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check for the other diagnosis codes.
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Check if diagnosis code(s) other than U1419 is set.
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Q.
Is the diagnosis code set?
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Follow the relevant diagnosis code procedure, and then go to Step 6.
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Go to Step 4.
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STEP 4. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U1419 set?
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Replace the steering wheel sensor. (Refer to .) Then
go to Step 5.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Turn the ignition switch to the "LOCK" (OFF) position.
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(2)Turn the ignition switch to the "ON" position.
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(3)Erase the diagnosis code.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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(5)Turn the ignition switch to the "ON" position.
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(6)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U1419 set?
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Replace the hydraulic unit (integrated with ASTC-ECU). (Refer to .)
Then go to Step 6.
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The procedure is complete.
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STEP 6. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(3)Turn the ignition switch to the "ON" position.
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(4)Check if the diagnosis code is set.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1419 set?
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Return to Step 1.
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The procedure is complete.
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