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
54F, CAN bus-line diagnostic flow ![]() |
DIAGNOSIS |
STEP 1. M.U.T.-III CAN bus diagnostics. |
STEP 2. Check whether the diagnosis code is reset. |
![]() |
(2)Erase the diagnosis code. (3)Turn the ignition switch to the "LOCK" (OFF) position. (4)Turn the ignition switch to the "ON" position. (5)Check if the diagnosis code is set. (6)Turn the ignition switch to the "LOCK" (OFF) position. Q.
Is code No.C1226, C1231, C1236, C1241, C1246, C1251,
C1256 or C1261 set?![]() ![]() |
STEP 3. Voltage measurement at ABS-ECU connector A-03. |
![]() |
(1)Disconnect the connector A-03,
and connect special tool ABS Check Harness (MB991974) to
the wiring harness-side connector.
(3)Measure the voltage between terminal 1 and earth. OK: System voltage Q.
Is the check result normal?![]() ![]() |
STEP 4. Check ABS-ECU connector A-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector. |
![]() |
Q.
Is the check result normal?![]() ![]() |
STEP 5. Resistance measurement at ABS-ECU connector A-03. |
![]() |
(1)Disconnect the connector A-03,
and connect special tool ABS Check Harness (MB991974) to
the wiring harness-side connector.
OK: 2 ohm or less Q.
Is the check result normal?![]() ![]() |
STEP 6. Check ABS-ECU connector A-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector. |
![]() |
Q.
Is the check result normal?![]() ![]() |
STEP 7. Check whether the diagnosis code is reset. |
![]() |
Check again if the diagnosis code
is set. (1)Turn the ignition switch to the "ON" position. (2)Erase the diagnosis code. (3)Turn the ignition switch to the "LOCK" (OFF) position. (4)Turn the ignition switch to the "ON" position. (5)Check if the diagnosis code is set. (6)Turn the ignition switch to the "LOCK" (OFF) position. Q.
Is code No.C1226, C1231, C1236, C1241, C1246, C1251,
C1256 or C1261 set?![]() ![]() ![]() |
STEP 8. Check whether the diagnosis code is reset. |
![]() |
Check again if the diagnosis code
is set. (1)Turn the ignition switch to the "ON" position. (2)Erase the diagnosis code. (3)Turn the ignition switch to the "LOCK" (OFF) position. (4)Turn the ignition switch to the "ON" position. (5)Check if the diagnosis code is set. (6)Turn the ignition switch to the "LOCK" (OFF) position. Q.
Is code No.C1226, C1231, C1236, C1241, C1246, C1251,
C1256 or C1261 set?![]() ![]() |