Mitsubishi Colt Ralliart. Manual — part 445
TROUBLESHOOTING
POWER STEERING
37-47
STEP 5. 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.
(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 C1542 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
37-48
Code No.C1860 Power supply voltage abnormality (high voltage)
CAUTION
• If the electric power steering-ECU sets diagnosis code No.C1860, diagnose the CAN bus lines. If
there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
•
Power Supply and Earth Circuit
FUSIBLE
LINK
IGNITION
SWITCH (IG1)
4
ABS
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 : Grey R : Red P : Pink V : Violet PU : Purple
Whenever the ECU is replaced, ensure that the communication circuit is normal.
DIAGNOSIS CODE SET CONDITIONS
• The power supply voltage is more than a prede-
termined voltage stored in the microcomputer,
and the microcomputer determines that there is a
problem in the power supply system.
Criteria for judging malfunction
• Power supply voltage is more than 17.22 V
PROBABLE CAUSES
• Defective battery
• Charging system failed
• Malfunction of the electric power steering-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Check the battery voltage.
Start the engine and measure the battery voltage.
Q: Does the voltage measure 16 V or less?
YES :
Go to Step 2.
NO :
Check the charging system and repair if
necessary (Refer to GROUP 16, On-vehicle
Service
− Regulated Voltage Test
).
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-49
STEP 2. 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.
(7) Disconnect M.U.T.-III.
Q: Is diagnosis code C1860 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
37-50
Code No.C1861 Power supply voltage abnormality (low voltage)
CAUTION
• If the electric power steering-ECU sets diagnosis code No.C1861, diagnose the CAN bus lines. If
there is any fault in the CAN bus lines, an incorrect diagnosis code may be set.
•
Power Supply and Earth Circuit
FUSIBLE
LINK
IGNITION
SWITCH (IG1)
4
ABS
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 : Grey R : Red P : Pink V : Violet PU : Purple
Whenever the ECU is replaced, ensure that the communication circuit is normal.
DIAGNOSIS CODE SET CONDITIONS
• The power supply voltage is less than a predeter-
mined voltage stored in the microcomputer, and
the microcomputer determines that there is a
problem in the power supply system.
Criteria for judging malfunction
• Power supply voltage is less than 9 V
PROBABLE CAUSES
• Defective battery
• Charging system failed
• Malfunction of the electric power steering-ECU
• Damaged harness wires and connectors
DIAGNOSTIC PROCEDURE
STEP 1. Check the battery voltage.
Start the engine and measure the battery voltage.
Q: Does the voltage measure 10 V or more?
YES :
Go to Step 2.
NO :
Check the battery and the charging system
and repair if necessary (Refer to GROUP
54A, Battery
− Battery Test
GROUP 16, On-vehicle Service
−
Regulated Voltage Test
Main
Index
Group
TOC
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