Code No.C1707 Implausible coding data
caution |
- Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
- When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID.)
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DIAGNOSTIC FUNCTION
When the LDW-ECU receives incorrect vehicle information from the ETACS-ECU, diagnosis code No. C1707 will be set.
JUDGEMENT CRITERIA
When the LDW-ECU detects the ETACS-ECU coding data below consecutively five times (for 2.5 seconds or more), the LDW-ECU will determines that the system is defective.
- "LDW equipment status": Not Present
- "LDW Parameter status": Not parameter
- "LDW production setup status": Not Present
PROBABLE CAUSES
- Malfunction of the CAN bus line.
- Malfunction of the ETACS-ECU (you have substituted another ECU from a different vehicle, or the coding data is incorrect).
- Malfunction of the LDW-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting
). On completion, go to Step 2.
STEP 2. M.U.T.-III other system diagnosis code
Check if the ETACS diagnosis code is set.
Q.
Is the diagnosis code set?
Perform troubleshooting for ETACS (Refer to GROUP 54A - ETACS - Troubleshooting).
Go to Step 3.
STEP 3. Check the coding data in the ETACS-ECU.
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(1)Use M.U.T.-III to read out the coding data in ETACS-ECU. (Refer to GROUP 00 - Precautions before Service - Coding Reference Table .)
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(2)Check the followings:
- "LDW equipment status" is set to a correct value ("Type A").
- "LDW Parameter status" is set to a correct value ("Type 5").
- "LDW production setup status" is set to a correct value ("Type B").
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Q.
Is the check result normal?
Go to Step 4.
Replace with the coded ETACS-ECU, and then go to Step 4.
STEP 4. Check whether the diagnosis code is set again.
Recheck if the diagnosis code No. C1707 is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the LDW-ECU.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).