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DTC 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.
 
 
DTC SET CONDITIONS
This DTC 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
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 open circuit in GND line between E-18 FCM/LDW/AHB-ECU connector (terminal No.9) and body ground.
Is the check result normal?
Go to Step 4
Repair the connector(s) or wiring harness.
 
STEP 4. Voltage measurement at E-18 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 (terminal No.12) and body ground.
OK: Battery positive voltage
Is the check result normal?
Go to Step 5
Go to Step 6
 
STEP 5. Check whether the DTC is set again.
Check again if the DTC is set in the FCM/LDW/AHB-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
Is the DTC 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 ground, and open circuit in IG line (terminal No.12) between fusible link 34 and E-18 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.