Code No.U1190
No receive fault detect signal
| caution |
- If diagnosis
code No. U1190 is set, be sure to diagnose the CAN bus line.
- Before replacing the ECU, ensure that the power supply circuit, the earth circuit
and the communication circuit are normal.
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DIAGNOSTIC FUNCTION
When the LDW-ECU receives no fault detection control signal from the ETACS-ECU for 5 seconds
or more, it will set diagnosis code No. U1190.
JUDGEMENT CRITERIA
Check Conditions
- When all the following conditions are met.
- Power supply mode: ON
- ETACS-ECU system voltage is at 10 to 16 V.
Judgement Criterion
- After the following condition is met, 5 seconds or more have elapsed.
- CAN signal from the ETACS-ECU cannot be received.
PROBABLE CAUSES
- Malfunction of the CAN bus
- Malfunction of ETACS-ECU
- Malfunction of the LDW-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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 again if the diagnosis code is set in the ETACS-ECU.
Q.
Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS), and then go to Step 5
.
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set in the combination meter.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
Go to Step 4.
STEP 4. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the LDW-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the engine 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, and then go to Step 5.
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to cope with Intermittent Malfunction).
STEP 5. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the LDW-ECU.
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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 diagnosis code No.U1190 set?
Return to Step 1.
This diagnosis is complete.