Mitsubishi Colt Ralliart. Manual — part 438

TROUBLESHOOTING

POWER STEERING

37-19

Code No.C1513 Large difference between main torque sensor and sub torque sensor

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 sum of the torque sensor main output volt-

age and sub output voltage does not meet a pre-
determined value stored in the microcomputer,
and the microcomputer determines that a prob-
lem has occurred in the mutual monitoring for the
sensor main/sub systems.
Criteria for judging malfunction

• The sum of the torque sensor main output

voltage and sub output voltage is more than
5.3 V or less than 4.7 V.

PROBABLE CAUSES

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

• Defective torque sensor of the steering gear and

linkage assembly

• Malfunction of the electric power steering-ECU

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-20

DIAGNOSTIC PROCEDURE

STEP 1. 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) Start the engine, and check the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is diagnosis code C1513 (status: active) set?

YES :

Go to Step 6.

NO :

Go to Step 2.

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) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF)

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check whether diagnosis code C1511 or C1512

is set as past trouble.

(6) Turn the ignition switch to the "LOCK" (OFF)

position.

Q: Is diagnosis code C1511 or C1512 set as stored

trouble?
YES :

Go to Step 3.

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

37-21

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 earth circuit to the electric
power steering-ECU for open circuit.

AC314189AH

Connector: B-37-1, B-38

B-37-1

B-38

Harness side

B-37-1

B-38

Disconnect electric power steering-ECU connectors
B-38 and B-37-1, and measure the internal resist-
ance in the ECU.

•

AC400134

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

AB

Harness side
connector B-38
(Rear view)

Measure the resistance between connector B-38 ter-

minal 21 and connector B-37-1 terminal 13.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the electric power steering-ECU
(Refer to

P.37-102

).

Main

Index

Group

TOC

TROUBLESHOOTING

POWER STEERING

37-22

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, 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 set?

YES : .

The malfunction is intermittent. Refer to

GROUP 00, How to Use
Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunction

P.00-13

.

NO : .

Replace the steering box and linkage

assembly (Refer to

P.37-96

).

STEP 6. Check the torque sensor for short to
earth or open circuit.

AC314189AD

Connector: B-37-1

Harness side

• Harness wire between electric power steer-

ing-ECU connector B-37-1 and the torque sensor

• Check electric power steering-ECU connector

B-37-1 and its terminals.

Q: Are the wiring harness and the connectors in good

condition?
YES :

Go to Step 7.

NO :

Repair the wiring harness or the
connector(s).

Main

Index

Group

TOC