Code No. C1799:
FCM control disabled (ENGINE)
caution |
If a diagnosis code is set,
be sure to diagnose the CAN bus line.
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DIAGNOSTIC FUNCTION
If the laser radar receives a signal indicating that the FCM-LS control is prohibited
from the engine ECU, diagnosis code No. C1799 is set.
CHECK CONDITION
When all the following conditions are satisfied.
- After the ignition switch is turned ON, two or more seconds passed.
- After the engine has started.
PROBABLE CAUSES
- Malfunction of the engine system (general illumination
failure of the engine warning lamp)
- Malfunction of the combination meter system (ambient temperature sensor)
- Malfunction of the CAN bus line
- Malfunction of the laser radar
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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 2.
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Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
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STEP 2. M.U.T.-III other system diagnosis code check.
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Check if a diagnosis code other than No. P1570 is set in the engine ECU.
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Q.
Is a diagnosis code other than No. P1570 set?
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Perform the MPI troubleshooting (Refer to GROUP 13A - Troubleshooting ).
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Go to Step 3.
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STEP 3. M.U.T.-III other system data list.
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Check the engine ECU service data (Refer to GROUP 13A - Troubleshooting ).
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- Item No.181: Ambient temperature
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Q.
Is the check result normal?
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Go to Step 4.
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Perform "Ambient temperature sensor does not work." of the combination meter.
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STEP 4. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the laser radar.
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(1)Erase the set diagnosis code.
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(2)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the laser radar (Refer to ).
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction).
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