[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
17 -ENGINE AND EMISSION CONTROL > ADAPTIVE CRUISE CONTROL SYSTEM (ACC) > DIAGNOSIS CODE PROCEDURES > CODE NO. C1750: ACC/FCM-ECU VOLTAGE OUT OF RANGE
Code No. C1750: Voltage Out of Range
 
 
cautionWhen the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).
 
 
OPERATION
ACC/FCM-ECU power supply is provided from the battery via ETACS-ECU.
 
 
DIAGNOSIS CODE SET CONDITIONS
Check Condition
  • More than 3 seconds have passed since the ignition switch was turned to "ON" position.
Judgement Criterion
  • Voltage between the battery and ACC/FCM-ECU: Less than 8.5 V for 5 seconds.
or
  • Voltage between the battery and ACC/FCM-ECU: More than 18.5 V for 5 seconds.
noteA diagnosis code is not set as a historic fault.
 
 
PROBABLE CAUSES
  • Battery failure
  • Loose battery terminal
  • Malfunction of charging system
  • Damaged harness wires and connectors
  • Malfunction of ACC/FCM-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check the battery.
Refer to GROUP 54A - Battery Test .
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 .
Is the check result normal?
Go to Step 3.
Repair or replace the charging system component(s).
 
STEP 3. Check of damage in GND line between ACC/FCM-ECU connector and body earth.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Measure the terminal voltage at ACC/FCM-ECU connector
(1) Check the connector
(2) Disconnect the connector.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the terminal voltage between ACC/FCM-ECU connector terminal IG and body earth at the wiring harness side.
OK: System voltage
Is the check result normal?
Go to Step 5.
Repair the connector(s), or check and repair of short to earth, and open circuit in OUT2 to IG line between DC/DC converter (control system) connector and ACC/FCM-ECU connector.
 
STEP 5. Check whether the diagnosis code is set again.
Is diagnosis code No.C1750 set?
Replace the ACC/FCM-ECU (Refer to ).
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).