Code No. C1864 Abnormality in G and yaw rate sensor operation voltage








caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION
The G and yaw rate sensor output signal is sent to ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
The G and yaw rate sensor monitors the power supply voltage supplied from the electric motor switch "ON", and if the sensor determines that the voltage value is abnormality, it sets this code.

PROBABLE CAUSES

  • Damaged harness wires and connectors
  • Charging circuit failure
  • Malfunction of the G and yaw rate sensor

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is the diagnosis code No.C1864 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. Auxiliary battery check

Q. Is the battery in good condition?
Go to Step 4.
Replace the auxiliary battery. Then go to Step 4.

STEP 4. Charging system check
Check if diagnosis code is set to the OBC.

Q. Is the diagnosis code set?
Troubleshooting the OBC (Refer to GROUP 54D - OBC/Diagnosis Code Chart ). Then go to Step 5.
Go to Step 5.

STEP 5. Connector check: C-20 G and yaw rate sensor connector, B-303 junction block connector

Q. Is the check result normal?
Go to Step 6.
Repair the damaged connector.

STEP 6. Voltage measurement at C-20 G and yaw rate sensor connector
(1)Disconnect the C-20 G and yaw rate sensor connector, and measure at the harness side connector.
(2)Measure the voltage at the C-20 G and yaw rate sensor connector terminal No.1 and body earth.
OK: Battery voltage

Q. Is the check result normal?
Go to Step 8.
Go to Step 7.

STEP 7. Check the wiring harness between C-20 G and yaw rate sensor connector and B-303 junction block connector.
(1)Disconnect the C-20 G and yaw rate sensor connector and the B-303 junction block connector, and measure at the harness side connector.
(2)Measure the resistance at the C-20 G and yaw rate sensor connector terminal No.1 and B-303 junction block connector terminal No.5.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Resistance measurement at C-20 G and yaw rate sensor connector
(1)Disconnect the C-20 G and yaw rate sensor connector, and measure at the harness side connector.
(2)Measure the resistance at the C-20 G and yaw rate sensor connector terminal No.4 and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Diagnosis code recheck
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.

Q. Is the diagnosis code No.C1864 set?
Replace the G and yaw rate sensor (Refer to ). Then go to Step 10.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 10. Diagnosis code recheck
(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.

Q. Is the diagnosis code No.C1864 set?
Return to Step 1.
This diagnosis is complete.