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:


PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check the battery.


Refer to GROUP 54A - 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.

Q. 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.


Q. 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

Q. 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.

Q. 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.


Q. 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.