Code No. C1707
Implausible coding data
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be stored. 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 diagnosis code No.C1707 is stored in ASC-ECU, the diagnosis code may also be stored
in ETACS-ECU. When the diagnosis code is stored in ETACS-ECU, carry out the diagnosis of the
diagnosis code for ETACS-ECU first.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
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OPERATION
ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN bus lines. This diagnosis code is stored when
the vehicle information received from the ETACS-ECU is invalid.
PROBABLE CAUSES
- ETACS-ECU malfunction.
- The ETACS-ECU, which was used on another vehicle, is installed on this vehicle.
- The hydraulic unit assembly (integrated with ASC-ECU), which was used on another
vehicle, is installed on this vehicle.
- Malfunction of the hydraulic unit assembly (integrated with ASC-ECU).
- Noise interference.
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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 line (Refer to GROUP 54C - Troubleshooting ).
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. C1707 stored?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. M.U.T.-III Diagnosis code of other systems
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Check whether a diagnosis code is stored in the ETACS-ECU (Refer to GROUP 54A - ETACS,
Diagnosis Code Chart ).
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Q.
Is the diagnosis code stored?
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Follow the relevant diagnosis code procedure. Then go to Step 7.
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Go to Step 4.
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STEP 4. ETACS-ECU coding data check
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Using M.U.T.-III, check if any abnormality is present to the coding data which are stored
in the ETACS-ECU. (Refer to GROUP 00 - Coding Reference Table <Vehicles
for GCC>, <Vehicles for THAILAND>.)
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Q.
Is the check result normal?
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Go to Step 5.
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Replace ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
Then go to Step 7.
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STEP 5. Check part number of ASC-ECU
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Check the part number of ASC-ECU.
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 7.
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STEP 6. Diagnosis code recheck
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. C1707 stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 7.
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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 7. Diagnosis code recheck.
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. C1707 stored?
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Return to Step 3.
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This diagnosis is complete.
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