[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > FCM/LDW/AHB-ECU > DIAGNOSIS CODE PROCEDURES > CODE NO. C1750 FCM VOLTAGE OUT OF RANGE
Code No. C1750 Voltage out of range
 
 
caution
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
FCM/LDW/AHB-ECU power supply is provided from the battery.
 
 
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality below is detected:
  • Voltage between the battery: Less than 10.0 V
  • Voltage between the battery: More than 16.0 V
 
 
PROBABLE CAUSES
  • Battery failure
  • Loose battery terminal
  • Malfunction of charging system
  • Malfunction of the FCM/LDW/AHB-ECU power supply circuit
  • Malfunction of the FCM/LDW/AHB-ECU
  • Damaged harness wires and connectors
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check the battery.
Refer to 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 open circuit in GND line between FCM/LDW/AHB-ECU connector and body earth.
Is the check result normal?
Go to Step 4
Repair the connector(s) or wiring harness.
 
STEP 4. Voltage measurement at FCM/LDW/AHB-ECU connector (IG terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check the voltage between the FCM/LDW/AHB-ECU connector (IG terminal) and body earth.
OK: System voltage
Is the check result normal?
Go to Step 5
Go to Step 6
 
STEP 5. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 6. Check of short to earth, and open circuit in IG line between fusible link and FCM/LDW/AHB-ECU connector.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.