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.
When diagnosis code No.C1707 is set in ABS-ECU, the diagnosis code may also be set
in ETACS-ECU. When the diagnosis code is set in ETACS-ECU, carry out the diagnosis of the diagnosis
code for ETACS-ECU first.
OPERATION
ABS-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
When received unset coding data from the ETACS-ECU, this diagnosis code is set.
PROBABLE CAUSES
Malfunction of ETACS-ECU
ETACS-ECUs have been interchanged between two vehicles.
ABS-ECU malfunction
ABS-ECUs have been interchanged between two vehicles.
Malfunction of ETACS-ECU coding data
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use 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 diagnosis code No.C1707 set?
Go to Step 3.
This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether any coding-related diagnosis code is set by ETACS-ECU.
Q.
Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code.
Go to Step 4.
STEP 4. Check part number of ABS-ECU
Check the part number of ABS-ECU.
Q.
Is the check result normal?
Go to Step 5.
Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then
go to Step 8.
STEP 5. ETACS-ECU coding data check
Refer to GROUP 00 - Coding List .
Q.
Is the check result normal?
Go to Step 6.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
STEP 6. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
Q.
Is the check result normal?
Go to Step 7.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
STEP 7. Check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to the "OFF" position.
(3)Turn the ignition switch to the "ON" position.
(4)Turn the ignition switch to the "OFF" position.
(5)Turn the ignition switch to the "ON" position.
(6)Check that the ABS warning lamp goes out.
Q.
Is diagnosis code No.C1707 set?
Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ). Then
go to Step 8.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
STEP 8. Check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the ignition switch to the "OFF" position.
(3)Turn the ignition switch to the "ON" position.
(4)Turn the ignition switch to the "OFF" position.
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table 
).
On completion, go to Step 2.