Code No. U1900:
K-line between MCUs slave lost
Code No. U1910: K-line between MCUs reception error
| caution |
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
|
ELECTRIC MOTOR UNIT CONTROL SYSTEM CIRCUIT
OPERATION
- The CAN communication between the MCU and EV-ECU is backed
up by the K-LINE communication.
DIAGNOSIS CODE SET CONDITIONS
- If the K-LINE (back-up) communication data from the MCU
cannot be received, the diagnosis code No. U1900 will be set.
- If the K-LINE (back-up) communication data from the MCU is parity error or checksum,
the diagnosis code No. U1910 will be set.
PROBABLE CAUSES
- Damaged wiring harness or connector(s)
- Malfunction of the MCU system
|
|
STEP 1. M.U.T.-III CAN bus diagnosis
|
|
|
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 line. (Refer to GROUP 54C - Troubleshooting  .)
Then go to Step 2.
|
|
|
|
|
|
STEP 2. Check whether the diagnosis code is reset.
|
|
|
Check again if the diagnosis code No. U1900 or No. U1910 is set to the EV-ECU.
|
|
|
(1)Erase the stored diagnosis code.
|
|
|
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
|
|
|
(3)Check if the diagnosis code is set.
|
|
|
Q.
Is the diagnosis code set?
|
|
|
Go to Step 3.
|
|
|
|
|
|
This diagnosis is complete.
|
|
|
|
|
|
STEP 3. Connector check: E-06 MCU connector, C-110 EV-ECU connector
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Repair the damaged connector.
|
|
|
|
|
|
STEP 4. Check the wiring harness between E-06 MCU connector terminal
No. 9 and C-110 EV-ECU connector terminal No. 76.
|
|
|
Check the signal lines for open circuit.
|
|
|
Q.
Is the check result normal?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Repair the wiring harness.
|
|
|
|
|
|
STEP 5. Use M.U.T.-III to confirm a diagnosis code of other systems.
|
|
|
Check if the diagnosis code is set to the MCU.
|
|
|
Q.
Is the diagnosis code set?
|
|
|
Carry out troubleshooting for the MCU. (Refer to Diagnosis Code Chart .)
Erase the diagnosis code, and then go to Step 6.
|
|
|
|
|
|
Go to Step 6.
|
|
|
|
|
|
STEP 6. Diagnosis code recheck
|
|
|
Check again if the diagnosis code is set to the EV-ECU.
|
|
|
(1)Erase the stored diagnosis code.
|
|
|
(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
|
|
|
(3)Check if the diagnosis code is set.
|
|
|
Q.
Is the diagnosis code set?
|
|
|
Return to Step 1.
|
|
|
|
|
|
The diagnosis is complete.
|
|
|
|
MMC-Manuals.ru
)
)
)