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 

P.37-84

).

• Item 02: Torque sensor sub system (Refer to 

P.37-84

).

• Item 03: Torque sensor voltage (Refer to 

P.37-84

).

•

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 

P.37-102

). 

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 

P.37-96

).

NO : 

The malfunction is intermittent. Refer to 
GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction 

P.00-13

.

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 

(Refer to 

P.37-102

). 

NO : . 

The malfunction is intermittent. Refer to 

GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction 

P.00-13

.

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