Code No. C1750:
ACC/FCM Voltage Out of Range
| caution |
- When
the ACC/FCM-ECU is replaced, calibrate the radar (refer to
 ).
|
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.
|
PROBABLE CAUSES
- Battery failure
- Loose battery terminal
- Malfunction of the charging system
- Damaged harness wires and connectors
- Malfunction of the ACC/FCM-ECU
|
|
STEP 1. Check the battery.
|
|
|
Refer to GROUP 54A -
Battery, On-vehicle Service, Battery Test.
|
|
|
Q.
Is the check result normal?
|
|
|
 Go to Step 2.
|
|
|
|
|
|
 Charge or replace the battery.
|
|
|
|
|
|
STEP 2. Check the charging system.
|
|
|
Refer to GROUP 16 -
Charging System, On-vehicle Service.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 3.
|
|
|
|
|
|
Repair or replace the charging system component(s).
|
|
|
|
|
|
STEP 3. Voltage measurement at ACC/FCM-ECU connector.
|
|
|
(2)Disconnect the connector.
|
|
|
(3)Turn the ignition switch to the "ON" position.
|
|
|
(4)Measure the voltage between terminal IG and body earth at the wiring harness side.
OK: System voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Repair the defective connector or the wiring harness (power supply line).
|
|
|
|
|
|
STEP 4. Check the wiring harness between ACC/FCM-ECU connector GND
terminal line and body earth line.
|
|
|
Check the earth line for damage circuit.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair the defective the earth line.
|
|
|
|
|
|
STEP 5. M.U.T.-III data list.
|
|
|
Check the following data list (Refer to ).
|
|
|
- Item No. 1: ECU power supply voltage
|
|
|
Q.
Is the check result normal?
|
|
|
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunction).
|
|
|
|
|
|
Replace the ACC/FCM-ECU (Refer to ).
|
|
|
|