Code No.C1803
ACC mode off disagreement
Code No.C1804 ACC deactivation disagreement
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Before replacing the ECU,
ensure that the communication circuit is normal.
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The ASC-ECU receives ACC control status signal from the ACC/FCM-ECU, and vehicle
control status signal from the engine-ECU via CAN bus lines, respectively.
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DIAGNOSIS CODE SET CONDITIONS
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If the information received from the ACC/FCM-ECU does not correspond to that
received from the engine-ECU, the ASC-ECU will store the diagnosis code.
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- Wiring harness or connector failure of CAN bus line
- Malfunction of engine-ECU
- Malfunction of ACC/FCM-ECU
- Malfunction of ASC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use 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 2.
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Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
On completion, go to Step 3.
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STEP 2. M.U.T.-III Diagnosis code of other system
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Use M.U.T.-III to check that the diagnosis code is set by the engine-ECU and ACC/FCM-ECU.
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Q.
Is the diagnosis code set?
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Troubleshoot for the relevant diagnosis code (Refer to GROUP 13B - Troubleshooting <engine-ECU> or
GROUP 17 - Adaptive Cruise Control System (ACC) <ACC/FCM-ECU>).
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Go to Step 3.
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STEP 3. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Ignition switch "LOCK" (OFF)
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Q.
Is diagnosis code No.C1803 or C1804 set?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 4.
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This diagnosis is complete.
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STEP 4. Check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Ignition switch "LOCK" (OFF)
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Q.
Is diagnosis code No.C1803 or C1804 set?
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Return to Step 1.
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This diagnosis is complete.
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