Code No.U1100
Engine-ECU <M/T>
or Engine-A/T-ECU <A/T>
Time-out
(Related to Engine) <3000, 3200 and 3800>
caution |
- If diagnosis code U1100
is set in the combination meter, always diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
|
TROUBLE JUDGMENT
The combination meter receives engine control system-related signals from the engine-ECU <M/T>
or
engine-A/T-ECU <A/T>
via CAN bus lines. If the display unit
cannot receives the necessary signals, diagnosis code U1100 will be set.
note |
For 2800-vehicles, diagnosis code No.U1101 does not mean that there is a problem.
|
COMMENTS ON TROUBLE SYMPTOM
Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the engine-ECU <M/T>
or
engine-A/T-ECU <A/T>
and the combination meter, the power
supply system to the engine-ECU <M/T>
or engine-A/T-ECU <A/T>,
the engine-ECU <M/T>
or engine-A/T-ECU <A/T>
itself,
or the combination meter may be defective.
Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in
the CAN bus lines between the engine-ECU <M/T>
or engine-A/T-ECU <A/T>
and the
combination meter, and the power supply system to the engine-ECU <M/T>
or engine-A/T-ECU <A/T>.
For diagnosis procedures, refer to "How to cope with past trouble" (Refer to GROUP 00 -
How to
Use Troubleshooting/Inspection Service Points
).
note |
For a past trouble, you may not find it by the M.U.T.-III CAN bus diagnostics even if
there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points . and check the CAN bus lines. You can narrow
down the possible cause of the trouble by referring to the diagnosis code, which is set regarding
the CAN communication-linked ECUs (Refer to GROUP 54D -
CAN Bus Line Diagnostic Flow ).
|
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of engine-ECU <M/T>
or engine-A/T-ECU <A/T>
- Malfunction of combination meter
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 2.
Repair the CAN bus lines. (Refer to GROUP 54D -
Troubleshooting
). Repair
the CAN bus line and go to Step 6.
STEP 2. M.U.T.-III other system diagnosis code
Check whether the MPI system or Diesel system, and the A/T system diagnosis codes
are set or not.
Q.
Is the diagnosis code set?
Diagnose the MPI system or Diesel system, or the A/T system (Refer to
GROUP 13A, Troubleshooting
<3000>, GROUP
13B, Troubleshooting
<3800>, GROUP 13D, Troubleshooting
<3200>
or
GROUP 23A, Troubleshooting
<A/T system>).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
Multi-centre display
- Code No.U1100: engine-ECU <M/T>
or
engine-A/T-ECU <A/T>
time-out (related to Engine)
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not reset.
|
Q.
Is the check result normal?
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the engine-ECU <M/T>
or engine-A/T-ECU <A/T>
and
the combination meter (Refer to GROUP 00 -
How to use troubleshooting/Inspection
Service Points
).
Replace engine-ECU <M/T>
or engine-A/T-ECU <A/T>
and
then go to Step 6.
STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not reset.
|
Q.
Is the check result normal?
A poor connection, open circuit or other intermittent malfunction is present in
the CAN bus lines between the engine-ECU <M/T>
or engine-A/T-ECU <A/T>
and
the combination meter (Refer to GROUP 00 -
How to use troubleshooting/Inspection
Service Points
).
Replace combination meter and then go to Step 6.
STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch to "ON" position.
|
|
(3)On completion, check that the diagnosis code is not reset.
|
Q.
Is the check result normal?
The procedure is complete.
Go to Step 1.