Mitsubishi Colt Ralliart. Manual — part 436
TROUBLESHOOTING
POWER STEERING
37-11
PROBABLE CAUSES
C1511: Torque sensor main system malfunction
• Defective harness wire(s) or connector(s)
• Defective torque sensor of the steering gear and
linkage assembly
• Malfunction of the electric power steering-ECU
C1512: Torque sensor sub system malfunction
• Defective harness wire(s) or connector(s)
• Defective torque sensor of the steering gear and
linkage assembly
• Malfunction of the electric power steering-ECU
DIAGNOSIS 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) Start the engine, and check the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is the diagnosis code status changed from
"Stored" to "Active" when the engine is started?
YES : .
Go to Step 2.
NO : .
Go to Step 12.
STEP 2. 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) Check whether diagnosis codes C1511 and
C1512 are set simultaneously.
(3) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Are diagnosis codes C1511 and C1512 set
simultaneously?
YES :
Go to Step 8.
NO :
Go to Step 3.
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-12
STEP 3. Check the harness wires between
electric power steering-ECU connector B-37-1
(terminals 13, 16 and 18) and torque sensor.
AC314189AD
Connector: B-37-1
Harness side
Q: Is any wire between electric power steering-ECU
connector B-37-1 (terminals 13, 16 and 18) and
torque sensor damaged?
YES :
Repair it.
NO :
Go to Step 4.
STEP 4. Check the sensor signal lines for open
circuit.
AC314189AD
Connector: B-37-1
Harness side
Use the M.U.T.-III voltage measurement and data list
functions to measure the torque sensor main voltage
<C1511> or sub voltage <C1512> before the fail-safe
relay is activated (one second after the engine is
started) without disconnecting connector B-37-1 (by
backprobing).
• The steering is in the neutral position.
• Item 01: Torque sensor main system (Refer to
).
• Item 02: Torque sensor sub system (Refer to
).
• Item 03: Torque sensor voltage (Refer to
).
•
AC400119
Harness side
connector B-37-1
(Rear view)
AB
AC400121
Harness side
connector B-37-1
(Rear view)
AB
Measure the voltage between connector B-37-1 ter-
minals 12 and 13 (for main system), and connec-
tor B-37-1 terminals 13 and 16 (for sub system).
OK: 2.4
− 2.6 V
Main
Index
Group
TOC
TROUBLESHOOTING
POWER STEERING
37-13
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 5.
STEP 5. Check the electric power steering-ECU
for internal short to earth.
AC314189AD
Connector: B-37-1
Harness side
Disconnect electric power steering-ECU connector
B-37-1, and measure the internal resistance in the
ECU.
•
AC400124
Harness side
connector B-37-1
(Rear view)
AB
AC400123
14
18
13
17
12
16
11
15
Harness side
connector B-37-1
(Rear view)
AB
Measure the resistance between connector B-37-1
terminals 12 and 13 (for main system), and con-
nector B-37-1 terminals 13 and 16 (for sub sys-
tem).
OK: 0.5k
− 1.5 kΩ
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace the electric power steering-ECU
(Refer to
).
STEP 6. 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 turn the steering wheel.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is diagnosis code C1511 or C1512 set?
YES :
Replace the steering gear and linkage
assembly (Refer to
).
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
37-14
STEP 7. 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 turn the steering wheel.
(6) Check if the diagnosis code is set.
(7) Turn the ignition switch to the "LOCK" (OFF)
position.
Q: Is diagnosis code C1511 or C1512 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 8. Check the harness wires between
electric power steering-ECU connector B-37-1
(terminals 13, 16 and 18) and torque sensor.
AC314189AD
Connector: B-37-1
Harness side
Q: Is any wire between electric power steering-ECU
connector B-37-1 (terminals 13, 16 and 18) and
torque sensor damaged?
YES :
Repair it.
NO :
Go to Step 9.
Main
Index
Group
TOC
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