Mitsubishi Colt Ralliart. Manual — part 454
TROUBLESHOOTING
POWER STEERING
37-83
STEP 7. Check the harness wires.
•
AC314189
AC314189
AC314189AG
Connector: B-38
Harness side
Harness wire between electric power steering-ECU
connector B-38 and fusible link No.22
Check the harness wire above for damage or other
problem.
Q: Is the harness wire in good condition?
YES :
Go to Step 11.
NO :
Repair the harness wire.
STEP 8. Check the harness wires.
•
AC314189
AC314189
AC314189AG
Connector: B-38
Harness side
Harness wire between electric power steering-ECU
connector B-38 and body earth
Check the harness wire above for damage or other
problem.
Q: Is the harness wire in good condition?
YES :
Go to Step 11.
NO :
Repair the harness wire.
STEP 9. Check the battery
Refer to GROUP 54A, Battery Test
Q: Is the battery in good condition?
YES :
Go to Step 10.
NO :
Charge or replace the battery.
STEP 10. Check the charging system.
Refer to GROUP 16, Charging System
.
Q: Is the charging system in good condition?
YES :
Go to Step 11.
NO :
Repair or replace the charging system.
STEP 11. Retest the system.
Q: Is the check result normal?
YES :
The malfunction is intermittent. Refer to
GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunction
.
NO :
Replace the electric power steering-ECU
(Refer to
).
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-84
DATA LIST REFERENCE TABLE
M1372007700062
The following items can be read by the M.U.T.-III
from the electric power steering-ECU input data.
When the system is normal.
Item No.
Check item
Check condition
Normal condition
01
Torque sensor
(main)
• Start the engine.
• Turn the steering wheel
with a vehicle
stationary.
Centre position
Approximately 2500 mV
Steering wheel
turned to right
2500
− 4500 mV
Steering wheel
turned to left
500
− 2500 mV
02
Torque sensor
(sub)
• Start the engine.
• Turn the steering wheel
with a vehicle
stationary.
Centre position
Approximately 2500 mV
Steering wheel
turned to right
2500
− 500 mV
Steering wheel
turned to left
4500
− 2500 mV
03
Torque sensor
supply voltage*
Start the engine.
3750
− 4250 mV
05
Motor current
• Start the engine.
• Turn the steering wheel to the left and
right with a vehicle stationary.
Approximately 50 A or
less
(When the steering wheel
is not operated,
approximately 0 V)
06
Motor current
(desired value)
• Start the engine.
• Turn the steering wheel to the left and
right with a vehicle stationary.
Approximately 50 A or
less
(When the steering wheel
is not operated,
approximately 0 V)
07
Assist limit
current (limit
value)
• Start the engine.
• Turn the steering wheel to the left and
right with a vehicle stationary.
Approximately 50 A or
less
(After at least 10 minutes
without operating the
steering wheel,
approximately 50 A)
10
Relay voltage
• Start the engine.
• Turn the steering wheel to the left and
right with a vehicle stationary.
B+ (approximately 12 V)
or less
11
Vehicle speed
Perform a test run of the vehicle.
Speedometer displayed
value and M.U.T.-III
displayed value agree with
each other.
12
Engine speed
Start the engine.
Tachometer displayed
value and M.U.T.-III
displayed value agree with
each other.
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-85
NOTE: Item No.13 (idle-up relay) is displayed on
M.U.T.-III. In this case, however, the idle-up signal is
not accepted by the engine-ECU, and the idle speed
will not actually increase. Therefore, the item No.13
is excluded from the above table.
NOTE: *: Torque sensor is supplied either with 3 V or
8 V. Only the 8 V side of the torque sensor power
supply can be monitored by M.U.T.-III as service data
(Output is 8V x 0.5). Even though the 8 V-ide torque
sensor power supply is normal, diagnosis code
C1514 (abnormal torque sensor power supply) is dis-
played if any malfunction occurs in the 3 V-side
power supply.
When the electric power steering-ECU shut off electric power steering system opera-
tion.
When the diagnosis system stops the electric power
steering-ECU, the M.U.T.-III display data will be
unreliable.
ACTUATOR TEST REFERENCE TABLE
M1372007800047
The M.U.T.-III activates the following actuators for
testing.
NOTE: If the electric power steering-ECU runs down,
actuator testing cannot be carried out.
NOTE: Actuator testing is only possible when the
vehicle is stationary.
No.
Item
01
Vehicle speed 5km/h
Forced vehicle speed sensitivity
02
Vehicle speed 25km/h
03
Vehicle speed 50km/h
04
Vehicle speed 75km/h
05
Vehicle speed 100km/h
06
Forced idle up ON
Forced idle up ON
No idle-up
00
Forced idle up OFF (Plant)
14
Fail-safe relay
Stop the engine. (Ignition switch: ON)
OFF
Start the engine, and let it idle.
ON
15
Ignition switch
key signal
Ignition switch: from ON to OFF
OFF
Ignition switch: ON
ON
Item No.
Check item
Check condition
Normal condition
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-86
CHECK AT ELECTRIC POWER STEERING-ECU
M1372008000066
AC208338
1 2
5 6
3 4
8
7
1112
1516
1314
18
17
21
22
31
32
AD
B-37
B-37-1
B-38
B-38-1
Terminal
No.
Check item
Checking requirement
Normal condition
5
Ignition key signal
Ignition switch: ON
System voltage
Ignition switch: OFF
0 V
12
Torque sensor main signal
• Start the engine.
• Turn the steering wheel to the
left and right with a vehicle
stationary.
0.5
− 4.5 V
(When the steering
wheel is not operated,
approximately 2.5 V)
13
Torque sensor GND
Always
0 V
14
8 V-power supply to the torque
sensor
Start the engine, and let it idle.
7.6
− 8.4 V
15
Torque sensor shield earth
Always
0 V
16
Torque sensor sub signal
• Start the engine.
• Turn the steering wheel to the
left and right with a vehicle
stationary.
0.5
− 4.5 V
(When the steering
wheel is not operated,
approximately 2.5 V)
18
3 V-power supply to torque sensor
Ignition switch: ON
2.93
− 3.07 V
21
Earth
Always
0 V
22
Battery power supply
Always
System voltage
31
Motor (L)
• Start the engine.
• Turn the steering wheel to the
left with a vehicle stationary.
Approximately 50 A or
less
32
Motor (R)
• Start the engine.
• Turn the steering wheel to the
right with a vehicle stationary.
Approximately 50 A or
less
Main
Index
Group
TOC
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст