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.

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POWER STEERING

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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 

P.00-13

. Carry 

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 

P.00-13

 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 

P.54D-7

).

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 

P.54D-13

). Then go to Step 2.

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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 

P.13A-20

 

<4A9>, GROUP 13B, Troubleshooting 

P.13B-18

 <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 

P.54A-59

)

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 

P.13A-372

).

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POWER STEERING

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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 

(Refer to 

P.37-102

).

NO : 

The malfunction is intermittent. Refer to 
GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction 

P.00-13

.

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