Mitsubishi Colt Ralliart. Manual — part 441
TROUBLESHOOTING
POWER STEERING
37-31
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, Diagnosis
). Then go to Step
2.
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) Check that a ABS system diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is an ABS system diagnosis code set?
YES :
Diagnose the ABS system (Refer to
GROUP 35B, Troubleshooting
NO :
Go to Step 3.
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-32
STEP 3. Check whether the diagnosis code is
reset.
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) Recheck whether diagnosis code C1521 is set.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is diagnosis code C1521 set?
YES :
Replace the electric power steering-ECU
). Then go to Step 4.
NO :
The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
.
STEP 4. Check whether the diagnosis code is
reset.
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) Recheck whether diagnosis code C1521 is set.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
(7) Disconnect M.U.T.-III.
Q: Is diagnosis code C1521 set?
YES :
Replace the hydraulic unit (Integrated with
ABS-ECU) (Refer to GROUP 35B,
Hydraulic Unit
).
NO :
This diagnosis is complete.
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-33
Code No.C1522 Engine speed input malfunction
CAUTION
• If the electric power steering-ECU sets diagnosis code No.C1522, 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
37-34
DIAGNOSIS CODE SET CONDITIONS
• If the system receives an abnormal engine speed
signal and the microprocessor determines that
the engine speed measurement system is defec-
tive.
Criteria for judging malfunction
• When the vehicle maintains the vehicle speed
of 15 km/h or above and the engine speed
signal stays 0 rpm for 60 seconds
PROBABLE CAUSES
• Defective wire(s) or connector(s) in the crank-
shaft angle sensor input circuit of the
engine-CVT-ECU
• Malfunction of the engine-CVT-ECU
• Malfunction of the electric power steering-ECU
• The vehicle kept running with the engine stopped
for 60 seconds or more.
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, Diagnosis
). Then go to Step
2.
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 an engine control system diagnosis code set?
YES :
Diagnose the engine control system (Refer
to GROUP 13A, Troubleshooting
<4A9>, GROUP 13B, Troubleshooting
<4G1>). Then go to Step 3.
NO :
Go to Step 3.
Main
Index
Group
TOC
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