Code No. U1118:
4WD/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 - Troubleshooting
).
- 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 assembly (integrated with ABS-ECU) is replaced, always carry
out the calibration of the G sensor (Refer to
).
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OPERATION
The ABS-ECU communicates with the transfer-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If the ABS-ECU cannot receive any signal from the transfer-ECU for a predetermined period,
this diagnosis code will be set.
PROBABLE CAUSES
- The CAN bus line is defective.
- Malfunction of the transfer-ECU
- Malfunction of the hydraulic unit assembly (integrated with ABS-ECU)
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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 - Troubleshooting ).
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. Check for diagnosis codes 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 <6M/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 23A - Troubleshooting <SS4II>).
Then go to Step 6.
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Go to Step 4.
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STEP 4. Check for diagnosis codes of other systems.
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Check whether a 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 <6M/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. U1108 set?
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Replace the hydraulic unit assembly (integrated with ABS-ECU).
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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 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. U1108 set?
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Replace the hydraulic unit assembly (integrated with ABS-ECU).
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The procedure is complete.
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