Code No.U1197:
Variant coding data unavailable
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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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- Before replacing the ECU, ensure that the communication circuit is normal.
- When diagnosis code U1197 is set in ABS-ECU, the diagnosis code may also be set
in ETACS-ECU. When the diagnosis code is set in ETACS-ECU, carry out the diagnosis of the diagnosis
code for ETACS-ECU first.
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OPERATION
ABS-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ABS-ECU communicates with ETACS-ECU via CAN bus lines. This diagnosis code is set when
there is difference between the vehicle information from the ETACS-ECU and the vehicle information
stored in the ABS-ECU.
PROBABLE CAUSES
- Malfunction of ETACS-ECU
- ETACS-ECUs have been interchanged between two vehicles.
- ABS-ECU malfunction
- External noise interference
- ABS-ECUs have been interchanged between two vehicles.
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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 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis 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 from the "LOCK" (OFF) position to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1197 set?
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Go to Step 3.
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The procedure is complete.
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STEP 3. M.U.T.-III other system diagnosis code
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Use M.U.T.-III to check that other diagnosis code is set in the ETACS-ECU.
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Q.
Is any diagnosis code set?
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Perform troubleshooting for ETACS-ECU (Refer to GROUP 54A - ETACS, Troubleshooting ). Then
go to Step 6.
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Go to Step 4.
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STEP 4. Check ETACS coding data
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Refer to GROUP 00 - Coding List .
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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, ETACS-ECU ).
Then go to Step 6.
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STEP 5. Check part number of ABS-ECU
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Check the part number of ABS-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 ABS-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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(1)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No.U1197 set?
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Replace the hydraulic unit [(integrated with ABS-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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(1)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from the "ON" position to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No.U1197 set?
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Return to Step 1.
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This diagnosis is complete.
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