Mitsubishi Colt Ralliart. Manual - part 439

TROUBLESHOOTING

POWER STEERING

37-23

STEP 7. Check the torque sensor output voltage.

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 
or sub voltage before the fail-safe relay is activated 
(one second after the engine is started) without dis-
connecting 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

Measure the voltage between connector B-37-1 ter-

minals 12 and 13 (for main system)

•

AC400121

Harness side
connector B-37-1
 (Rear view)

AB

Measure the voltage between connector B-37-1 ter-

minals 13 and 16 (for sub system)

OK: 2.4 

− 2.6 V

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 9.

STEP 8. 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: Is diagnosis code C1513 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

.

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-24

STEP 9. Check the sensor circuit of the electric 
power steering-ECU for 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

Measure the resistance between connector B-37-1 

terminals 12 and 13.<Main>

•

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 13 and 16.<Sub>

OK: 0.5 

− 1.5 kΩ

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the steering gear and linkage 
assembly (Refer to 

P.37-96

).

STEP 10. 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 C1513 set?

YES : 

Replace the steering gear box 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

37-25

Code No.C1514 Torque sensor power supply abnormality

CAUTION

Whenever the ECU is replaced, ensure that the communication circuit is normal.

ELECTRIC POWER STEERING-ECU

TORQUE SENSOR

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

Torque Sensor Circuit

DIAGNOSIS CODE SET CONDITIONS

• The torque sensor power supply monitor voltage 

does not meet a predetermined voltage stored in 
the microcomputer, and the microcomputer deter-
mines that there is a problem in the torque power 
supply voltage.
Criteria for judging malfunction

• The 8-V power supply voltage is more than 

8.5 V or less than 7.5 V, or the 3-V power sup-
ply voltage is more than 3.12 V or less than 
2.88 V.

PROBABLE CAUSES

• Defective harness wire(s) or connector(s)

• Defective torque sensor of the steering gear and 

linkage assembly

• The electric power steering-ECU is defective.

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-26

DIAGNOSTIC PROCEDURE

STEP 1. 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 2.

STEP 2. Check for open circuit inside the 
steering gear box and linkage assembly.

AC314189AD

Connector: B-37-1

Harness side

Disconnect electric power steering-ECU connector 
B-37-1, and measure the internal resistance in steer-
ing gear and linkage assembly.

•

AC400139AB

Harness side
connector B-37-1
(Rear view)

Measure the resistance between connector B-37-1 

terminals 13 and 18.

OK: 400 

− 800 Ω

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the steering gear and linkage 
assembly (Refer to 

P.37-96

). 

Main

Index

Group

TOC