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 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 hydraulic unit (integrated with ASTC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to ).
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OPERATION
ASTC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ASTC-ECU communicates with ETACS-ECU via CAN bus lines. This diagnosis code is set when
the vehicle information received from the ETACS-ECU is invalid.
PROBABLE CAUSES
- Malfunction of the ETACS-ECU
- ETACS-ECUs have been interchanged between two vehicles.
- The ASTC-ECU, which was used on another vehicle, is installed on this vehicle.
- Malfunction of the hydraulic unit assembly (integrated with ASTC-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 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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(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. C1707 set?
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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 set in the ETACS-ECU (Refer to GROUP 54A - ETACS,
Diagnosis Code Chart ).
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Q.
Is the diagnosis code set?
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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.
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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 ASTC-ECU
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Check the part number of ASTC-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 assembly (integrated with ASTC-ECU) (Refer to ). Then
go to Step 7.
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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)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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(7)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1707 set?
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Replace the hydraulic unit assembly (integrated with ASTC-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. 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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(7)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1707 set?
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Return to Step 1.
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The procedure is complete.
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