Code No. U1118:
Transfer-ECU CAN timeout
caution |
- 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
).
- If diagnosis codes U1118 is set in ASTC-ECU, always diagnose the CAN bus line. If
there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case,
the set diagnosis code is not highly reliable.
- 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
The ASTC-ECU communicates with the Transfer-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If the ASTC-ECU cannot receive any signal from the Transfer-ECU for a predetermined period,
this diagnosis code will be set.
PROBABLE CAUSES
Current trouble
- The CAN bus line is defective.
- Malfunction of the Transfer-ECU
- Malfunction of the hydraulic unit assembly (integrated with ASTC-ECU)
Past trouble
- Carry out diagnosis with particular emphasis on wiring harness and
connector failures between ASTC-ECU and the wheel speed sensor. For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 - How to Cope with Intermittent Malfunctions
).
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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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Q.
Is diagnosis code No. U1118 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check whether a diagnosis code is set in the transfer-ECU (Refer to GROUP 22A - Transfer-ECU,
Troubleshooting, Diagnosis Code Chart <M/T> or
GROUP 23A - Transfer-ECU, Troubleshooting, Diagnosis Code Chart <A/T>).
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Q.
Is the diagnosis code set?
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Follow the relevant diagnosis code procedure (Refer to GROUP 22A - Transfer-ECU,
Troubleshooting, Diagnosis Code Chart <M/T> or
GROUP 23A - Transfer-ECU, Troubleshooting, Diagnosis Code Chart <A/T>).
Then go to Step 6.
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Go to Step 4.
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STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check whether an transfer-ECU "time-out" related diagnosis code is set in other ECUs.
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Q.
Is the diagnosis code set?
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Replace the transfer-ECU (Refer to GROUP 22A - Transfer-ECU <M/T> or
GROUP 23A - Transfer-ECU <A/T>).
Then go to Step 6.
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Go to Step 5.
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STEP 5. 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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Q.
Is diagnosis code No. U1118 set?
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Replace the hydraulic unit assembly (integrated with ASTC-ECU) (Refer to ).
Then go to Step 6.
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The procedure is complete.
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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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Q.
Is diagnosis code No. U1118 set?
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Return to Step 1.
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The procedure is complete.
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