Code No.U1100
Engine-ECU <M/T> or Engine-A/T-ECU <A/T> Time-out
(Related to Engine)
caution |
- If diagnosis
code U1100 is set in the centre display or multi display station, always diagnose the CAN bus
lines.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
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TROUBLE JUDGMENT
The centre display unit or multi display station 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 centre display unit or multi display station cannot receives the necessary
signals, diagnosis code U1100 will be set.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of engine-ECU <M/T> or engine-A/T-ECU <A/T>
- Malfunction of centre display unit or multi display station
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 satisfactory?
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 if an MPI system <3800> or diesel fuel system <3200> diagnosis
code is set.
Q.
Is the diagnosis code set?
Diagnose the MPI system <3800> or diesel fuel system <3200> (Refer
to GROUP 13B - Troubleshooting <3800> or
GROUP 13D - Troubleshooting ).
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.
- ASC-ECU
Code No.U1100: engine-ECU <M/T> or
engine-A/T-ECU <A/T> time-out (related to Engine)
- ETACS-ECU
Code No.U1100: engine-ECU <M/T> or
engine-A/T-ECU <A/T> time-out (related to Engine)
- A/C-ECU
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.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the check result satisfactory?
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 centre display unit or multi display station (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).
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.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the check result satisfactory?
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 centre display unit or multi display station (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ).
Replace centre display unit or multi display station and then go to step 6.
STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the check result satisfactory?
The procedure is complete.
Go to Step 1.