Code No.C1750:
ACC/FCM-ECU Voltage out of Range
caution |
- When
the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs
to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot
be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How
to Register Key ID
.)
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OPERATION
ACC/FCM-ECU power supply is provided from the battery via ETACS-ECU.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality below is detected:
- Voltage between the battery and ETACS-ECU: Less than 9.0 V
- Voltage between the battery and ETACS-ECU: More than 16.0 V
PROBABLE CAUSES
- Battery failure
- Loose battery terminal
- Malfunction of charging system
- Malfunction of ETACS-ECU (power supply circuit system)
- Damaged harness wires and connectors
- Malfunction of ACC/FCM-ECU
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STEP 1. Check the battery.
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Refer to GROUP 54A - 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 .
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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.01: 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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