Code No. C1750:
ACC/FCM Voltage Out of Range
caution |
- When
the ACC/FCM-ECU is replaced, calibrate the radar (refer to
).
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DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality below is detected:
- Voltage between the battery and ACC/FCM-ECU: Less than 10.0 V
- Voltage between the battery and ACC/FCM-ECU: More than 16.0 V
note |
A diagnosis code is not set as a historic fault.
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PROBABLE CAUSES
- Battery failure
- Loose battery terminal
- Malfunction of the charging system
- Damaged harness wires and connectors
- Malfunction of the ACC/FCM-ECU
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STEP 1. Check the battery.
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Refer to GROUP 54A -
Battery, On-vehicle Service, Battery Test.
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Q.
Is the check result normal?
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Go to Step 2.
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Charge or replace the battery.
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STEP 2. Check the charging system.
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Refer to GROUP 16 -
Charging System, On-vehicle Service.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair or replace the charging system component(s).
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STEP 3. Voltage measurement at ACC/FCM-ECU connector.
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(2)Disconnect the connector.
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(3)Turn the ignition switch to the "ON" position.
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(4)Measure the voltage between terminal IG and body earth at the wiring harness side. OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the defective connector or the wiring harness (power supply line).
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STEP 4. Check the wiring harness between ACC/FCM-ECU connector GND
terminal line and body earth line.
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Check the earth line for damage circuit.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the defective the earth line.
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STEP 5. M.U.T.-III data list.
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Check the following data list (Refer to ).
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- Item No. 1: ECU power supply voltage
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction).
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Replace the ACC/FCM-ECU (Refer to ).
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