Mitsubishi Colt Ralliart. Manual — part 444
TROUBLESHOOTING
POWER STEERING
37-43
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) Start the engine and move the steering wheel to
the right and left.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)
position.
(8) Disconnect M.U.T.-III.
Q: Is diagnosis code C1534 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
TROUBLESHOOTING
POWER STEERING
37-44
Code No.C1542 Fail-safe relay stuck off
CAUTION
• If the electric power steering-ECU sets diagnosis code No.C1542, diagnose the CAN bus lines. If
there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
•
ELECTRIC POWER STEERING-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 : Gray R : Red P : Pink V : Violet
Motor Circuit
Whenever the ECU is replaced, ensure that the communication circuit is normal.
DIAGNOSIS CODE SET CONDITIONS
• Although the fail-safe relay (power relay) is
turned on, the system is not energised and the
microcomputer determines that the relay contact
is open.
• The fail-safe relay (power relay) is not turned on
and the microcomputer determines that the relay
contact is open.
Criteria for judging malfunction
• Power supply voltage is less than 8 V and the
difference between the ignition voltage and
the power supply voltage is more than 2.5 V
when the fail-safe relay is off.
PROBABLE CAUSES
• Defective wire(s) or connector(s) in the power
supply circuit to the electric power steering-ECU
• Malfunction of the electric power steering-ECU
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-45
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III 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, and check the diagnosis code.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Are diagnosis codes C1542 and C1531 set
simultaneously?
YES :
Go to Step 2.
NO :
Go to Step 4.
STEP 2. Check the motor wires of the steering
gear and linkage assembly wiring harness for
short to earth.
AC314189AC
Connector: B-38-1
Harness side
Disconnect electric power steering-ECU connector
B-38-1 and measure the resistance.
•
AC313972BV
Harness side
connector B-38-1
(Rear view)
Measure the resistance between electric power
steering-ECU connector B-38-1 terminal 31 and
body earth.
• Measure the resistance between electric power
steering-ECU connector B-38-1 terminal 32 and
body earth.
OK: Open circuit or more than 300
Ω
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the steering gear and linkage
assembly (Refer to
).
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-46
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) Start the engine, and check the diagnosis code.
(6) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Are diagnosis codes C1542 and C1531 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
.
STEP 4. Check the motor wires of the steering
gear and linkage assembly wiring harness for
open circuit.
AC314189AC
Connector: B-38-1
Harness side
Disconnect electric power steering-ECU connector
B-38-1 and measure the resistance.
•
AC400133AB
Harness side
connector B-38-1
(Rear view)
Measure the resistance between electric power
steering-ECU connector B-38-1 terminals 31 and
32
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the harness wire and connector, or
replace the steering gear box and linkage
assembly (Refer to
).
Main
Index
Group
TOC
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