Mitsubishi Colt Ralliart. Manual — part 447
TROUBLESHOOTING
POWER STEERING
37-55
Code No.U1100 Engine-related time-out
CAUTION
• If more than three minutes elapse after the ignition switch is turned ON without starting engine,
the electric power steering-ECU may set diagnosis codes U1100 and U1102 as the M.U.T.-III shows
a diagnosis code status as stored.
• If the electric power steering-ECU sets diagnosis code No.U1100, diagnose the CAN bus lines. If
there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
•
ENGINE-CVT-ECU
DIAGNOSIS
CONNECTOR
FRONT SIDE
COMBINATION
METER
ABS-ECU
EPS-ECU
Wire colour code
B : Black
LG : Light green
G : Green
L: Blue
W : White
Y: Yellow
SB : Sky blue
BR : Brown
O : Orange
GR : Grey
R : Red
P : Pink
V : Violet
PU: Purple
CAN Communication Circuit
Whenever the ECU is replaced, ensure that the communication circuit is normal.
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-56
TROUBLE JUDGMENT
The electric power steering-ECU receives engine
speed data (crankshaft angle sensor data) from the
engine-CVT-ECU through the CAN bus lines. If the
ECU cannot receive the engine speed data (crank-
shaft angle sensor data) from the engine-CVT-ECU
for 60 seconds, diagnosis code U1100 will be set.
COMMENTS ON TROUBLE SYMPTOM
The M.U.T.-III shows a diagnosis code status as
active
• Defective harness wire(s) or connector(s) in the
CAN bus lines between the engine-CVT-ECU
and the electric power steering-ECU, or the
power supply to these ECUs, or the ECUs them-
selves are defective.
The M.U.T.-III shows a diagnosis code status as
stored
• Carry out diagnosis by referring to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to treat past trouble
out diagnosis with particular emphasis on con-
nector(s) or wiring harness in the CAN bus lines
between the engine-CVT-ECU and the electric
power steering-ECU, and the power supply to the
engine-CVT-ECU.
NOTE: As the M.U.T.-III shows a diagnosis code sta-
tus as stored, you can 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-How to Cope with Intermittent Malfunction
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
• Defective harness wire(s) or connector(s)
• Malfunction of the engine-CVT-ECU
• Malfunction of the electric power steering-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
AC206895
AC
Diagnosis
connector
MB991827
MB991824
MB991910
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
(1) Connect M.U.T.-III to the 16-pin diagnosis
connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54D, CAN bus line Diagnostic flow
). Then go to Step 2.
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-57
STEP 2. M.U.T.-III other system diagnosis code
AC206895
AC
Diagnosis
connector
MB991827
MB991824
MB991910
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
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) Start the engine.
(6) Check that an engine control system diagnosis
code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the diagnosis code set?
YES : .
Diagnose the engine control system (Refer
to GROUP 13A, Troubleshooting
<4A9>, GROUP 13B, Troubleshooting
<4G1>).
NO : .
Go to Step 3.
STEP 3. M.U.T.-III data list
Set the M.U.T.-III to the data reading mode, and
check the data list item (when the engine starts).
• Item 12: Engine speed
• Item 87: Tachometer (Refer to GROUP 54A,
Combination meter
− Data list reference table
)
OK: The reading on the tachometer nearly
match the indication on M.U.T.-III.
Q: Is the engine speed input normal?
YES :
Go to Step 4.
NO :
Replace the engine-CVT-ECU (Refer to
GROUP 13A, Engine-CVT-ECU
).
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-58
STEP 4. Check whether the diagnosis code is
reset
AC206895
AC311450
AB
Diagnosis
connector
MB991827
MB991824
MB991910
CAUTION
Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
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) Start the engine and wait for at least 60 seconds.
(6) Recheck whether diagnosis code U1100 is set.
(7) Turn the ignition switch to the "LOCK" (OFF)
position.
(8) Disconnect M.U.T.-III.
Q: Is diagnosis code U1100 set?
YES :
Replace the electric power steering-ECU
).
NO :
The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
.
Main
Index
Group
TOC
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